From 61da6c9ffb0f572e897e1e518060a4c6a0603636 Mon Sep 17 00:00:00 2001
From: "greenkeeper[bot]" <23040076+greenkeeper[bot]@users.noreply.github.com>
Date: Sun, 10 Nov 2019 19:09:10 -0800
Subject: [PATCH 01/39] chore(package): update standard-version to version
 5.0.0 (#73)

---
 package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package.json b/package.json
index f44d52d3..636cfddf 100644
--- a/package.json
+++ b/package.json
@@ -34,6 +34,6 @@
     "nyc": "^11.0.1",
     "rimraf": "^2.5.0",
     "standard": "^10.0.0-beta.0",
-    "standard-version": "^4.2.0"
+    "standard-version": "^5.0.0"
   }
 }

From 007cd70640764a45dc7630cf928838ddb32e6b9c Mon Sep 17 00:00:00 2001
From: bcoe <bencoe@google.com>
Date: Sun, 9 Feb 2020 19:26:32 -0800
Subject: [PATCH 02/39] chore: add renovate config

---
 renovate.json | 8 ++++++++
 1 file changed, 8 insertions(+)
 create mode 100644 renovate.json

diff --git a/renovate.json b/renovate.json
new file mode 100644
index 00000000..f6dd45e1
--- /dev/null
+++ b/renovate.json
@@ -0,0 +1,8 @@
+{
+  "extends": [
+    "config:base"
+  ],
+  "pinVersions": false,
+  "rebaseStalePrs": true,
+  "gitAuthor": null
+}

From 3cc0c287240727b84eaf1927f903612ec80f5e43 Mon Sep 17 00:00:00 2001
From: QmarkC <curtis.joe.berry@gmail.com>
Date: Tue, 4 Aug 2020 01:24:53 -0500
Subject: [PATCH 03/39] build!: drops Node 6 and 4. begin following Node.js LTS
 schedule (#89)

---
 .github/workflows/ci.yaml | 41 +++++++++++++++++++++++++++++++++++++++
 .gitignore                |  1 +
 .nvmrc                    |  1 +
 .travis.yml               |  7 -------
 README.md                 |  6 ++++++
 package.json              | 35 ++++++++++++++++++---------------
 6 files changed, 68 insertions(+), 23 deletions(-)
 create mode 100644 .github/workflows/ci.yaml
 create mode 100644 .nvmrc
 delete mode 100644 .travis.yml

diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
new file mode 100644
index 00000000..18714f3a
--- /dev/null
+++ b/.github/workflows/ci.yaml
@@ -0,0 +1,41 @@
+name: ci
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+env:
+  CI: true
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node: [10.x, 12.x, 14.x]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node }}
+      - run: node --version
+      - run: npm install
+      - run: npm test
+  windows:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: '12.x'
+      - run: npm install
+      - run: npm test
+  coverage:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: '14.x'
+      - run: npm install
+      - run: npm test
+      - run: npm run coverage
diff --git a/.gitignore b/.gitignore
index 62adae57..7f616c8a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .DS_Store
 node_modules
 .nyc_output
+package-lock.json
diff --git a/.nvmrc b/.nvmrc
new file mode 100644
index 00000000..b009dfb9
--- /dev/null
+++ b/.nvmrc
@@ -0,0 +1 @@
+lts/*
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 2465405e..00000000
--- a/.travis.yml
+++ /dev/null
@@ -1,7 +0,0 @@
-language: node_js
-sudo: false
-node_js:
-  - "4"
-  - "6"
-  - "node"
-after_success: npm run coverage
diff --git a/README.md b/README.md
index 826474f2..36cd3495 100644
--- a/README.md
+++ b/README.md
@@ -95,6 +95,12 @@ What locale is currently being used?
 
 Update the current locale with the key value pairs in `obj`.
 
+## Supported Node.js Versions
+
+Libraries in this ecosystem make a best effort to track
+[Node.js' release schedule](https://nodejs.org/en/about/releases/). Here's [a
+post on why we think this is important](https://medium.com/the-node-js-collection/maintainers-should-consider-following-node-js-release-schedule-ab08ed4de71a).
+
 ## License
 
 ISC
diff --git a/package.json b/package.json
index 636cfddf..e64aca3a 100644
--- a/package.json
+++ b/package.json
@@ -2,31 +2,31 @@
   "name": "y18n",
   "version": "4.0.0",
   "description": "the bare-bones internationalization library used by yargs",
-  "main": "index.js",
-  "scripts": {
-    "pretest": "standard",
-    "test": "nyc mocha",
-    "coverage": "nyc report --reporter=text-lcov | coveralls",
-    "release": "standard-version"
+  "keywords": [
+    "i18n",
+    "internationalization",
+    "yargs"
+  ],
+  "homepage": "https://github.com/yargs/y18n",
+  "bugs": {
+    "url": "https://github.com/yargs/y18n/issues"
   },
   "repository": {
     "type": "git",
     "url": "git@github.com:yargs/y18n.git"
   },
+  "license": "ISC",
+  "author": "Ben Coe <bencoe@gmail.com>",
+  "main": "index.js",
   "files": [
     "index.js"
   ],
-  "keywords": [
-    "i18n",
-    "internationalization",
-    "yargs"
-  ],
-  "author": "Ben Coe <ben@npmjs.com>",
-  "license": "ISC",
-  "bugs": {
-    "url": "https://github.com/yargs/y18n/issues"
+  "scripts": {
+    "coverage": "nyc report --reporter=text-lcov | coveralls",
+    "release": "standard-version",
+    "pretest": "standard",
+    "test": "nyc mocha"
   },
-  "homepage": "https://github.com/yargs/y18n",
   "devDependencies": {
     "chai": "^4.0.1",
     "coveralls": "^3.0.0",
@@ -35,5 +35,8 @@
     "rimraf": "^2.5.0",
     "standard": "^10.0.0-beta.0",
     "standard-version": "^5.0.0"
+  },
+  "engines": {
+    "node": ">=10"
   }
 }

From 3bedfcd26ba0ed53c2ee67730d1577679ff86dbb Mon Sep 17 00:00:00 2001
From: bcoe <bencoe@google.com>
Date: Mon, 3 Aug 2020 23:53:41 -0700
Subject: [PATCH 04/39] build: add release-please workflow

---
 .github/workflows/release-please.yml | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 .github/workflows/release-please.yml

diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
new file mode 100644
index 00000000..38ace4d2
--- /dev/null
+++ b/.github/workflows/release-please.yml
@@ -0,0 +1,14 @@
+on:
+   push:
+     branches:
+       - master
+name: release-please
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: GoogleCloudPlatform/release-please-action@v1.6.3
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          release-type: node
+          package-name: y18n

From 23605867872536b89f84049643f7ba6c5b15679e Mon Sep 17 00:00:00 2001
From: QmarkC <curtis@qmarkc.com>
Date: Tue, 4 Aug 2020 22:35:57 -0500
Subject: [PATCH 05/39] ci: remove coveralls (#92)

---
 .gitignore   |  1 +
 .nycrc       | 13 +++++++++++++
 README.md    |  6 ------
 package.json |  7 +++----
 4 files changed, 17 insertions(+), 10 deletions(-)
 create mode 100644 .nycrc

diff --git a/.gitignore b/.gitignore
index 7f616c8a..20bf8fcb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 .DS_Store
 node_modules
 .nyc_output
+coverage
 package-lock.json
diff --git a/.nycrc b/.nycrc
new file mode 100644
index 00000000..258129d5
--- /dev/null
+++ b/.nycrc
@@ -0,0 +1,13 @@
+{
+  "exclude": [
+    "test/**"
+  ],
+  "reporter": [
+    "html",
+    "text"
+  ],
+  "branches": 96.5,
+  "lines": 100,
+  "functions": 94,
+  "statements": 100
+}
diff --git a/README.md b/README.md
index 36cd3495..b80abac5 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,5 @@
 # y18n
 
-[![Build Status][travis-image]][travis-url]
-[![Coverage Status][coveralls-image]][coveralls-url]
 [![NPM version][npm-image]][npm-url]
 [![js-standard-style][standard-image]][standard-url]
 [![Conventional Commits](https://img.shields.io/badge/Conventional%20Commits-1.0.0-yellow.svg)](https://conventionalcommits.org)
@@ -105,10 +103,6 @@ post on why we think this is important](https://medium.com/the-node-js-collectio
 
 ISC
 
-[travis-url]: https://travis-ci.org/yargs/y18n
-[travis-image]: https://img.shields.io/travis/yargs/y18n.svg
-[coveralls-url]: https://coveralls.io/github/yargs/y18n
-[coveralls-image]: https://img.shields.io/coveralls/yargs/y18n.svg
 [npm-url]: https://npmjs.org/package/y18n
 [npm-image]: https://img.shields.io/npm/v/y18n.svg
 [standard-image]: https://img.shields.io/badge/code%20style-standard-brightgreen.svg
diff --git a/package.json b/package.json
index e64aca3a..3c523913 100644
--- a/package.json
+++ b/package.json
@@ -22,17 +22,16 @@
     "index.js"
   ],
   "scripts": {
-    "coverage": "nyc report --reporter=text-lcov | coveralls",
+    "coverage": "nyc report && nyc check-coverage",
     "release": "standard-version",
     "pretest": "standard",
     "test": "nyc mocha"
   },
   "devDependencies": {
     "chai": "^4.0.1",
-    "coveralls": "^3.0.0",
     "mocha": "^4.0.1",
-    "nyc": "^11.0.1",
-    "rimraf": "^2.5.0",
+    "nyc": "^15.1.0",
+    "rimraf": "^3.0.2",
     "standard": "^10.0.0-beta.0",
     "standard-version": "^5.0.0"
   },

From 887d8da59a84462313cd25b60d3217cf6f622166 Mon Sep 17 00:00:00 2001
From: bcoe <bencoe@google.com>
Date: Tue, 4 Aug 2020 20:42:05 -0700
Subject: [PATCH 06/39] build: remove unused standard-version

---
 package.json | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/package.json b/package.json
index 3c523913..ba621e74 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,6 @@
   ],
   "scripts": {
     "coverage": "nyc report && nyc check-coverage",
-    "release": "standard-version",
     "pretest": "standard",
     "test": "nyc mocha"
   },
@@ -32,8 +31,7 @@
     "mocha": "^4.0.1",
     "nyc": "^15.1.0",
     "rimraf": "^3.0.2",
-    "standard": "^10.0.0-beta.0",
-    "standard-version": "^5.0.0"
+    "standard": "^10.0.0-beta.0"
   },
   "engines": {
     "node": ">=10"

From d35bfd3a34f6aa102d1b6d33e95d1c262552147a Mon Sep 17 00:00:00 2001
From: "renovate[bot]" <29139614+renovate[bot]@users.noreply.github.com>
Date: Tue, 4 Aug 2020 20:43:12 -0700
Subject: [PATCH 07/39] chore(deps): update dependency mocha to v8 (#88)

Co-authored-by: Renovate Bot <bot@renovateapp.com>
---
 package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package.json b/package.json
index ba621e74..f15959c8 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
   },
   "devDependencies": {
     "chai": "^4.0.1",
-    "mocha": "^4.0.1",
+    "mocha": "^8.0.0",
     "nyc": "^15.1.0",
     "rimraf": "^3.0.2",
     "standard": "^10.0.0-beta.0"

From c51842196c8349519666911402f91735c707752b Mon Sep 17 00:00:00 2001
From: "Benjamin E. Coe" <bencoe@google.com>
Date: Tue, 4 Aug 2020 20:59:04 -0700
Subject: [PATCH 08/39] chore: update additional deps (#93)

---
 .nycrc            | 2 +-
 package.json      | 9 +++++----
 test/y18n-test.js | 2 +-
 3 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/.nycrc b/.nycrc
index 258129d5..22f97ab9 100644
--- a/.nycrc
+++ b/.nycrc
@@ -8,6 +8,6 @@
   ],
   "branches": 96.5,
   "lines": 100,
-  "functions": 94,
+  "functions": 93,
   "statements": 100
 }
diff --git a/package.json b/package.json
index f15959c8..ad989b65 100644
--- a/package.json
+++ b/package.json
@@ -22,16 +22,17 @@
     "index.js"
   ],
   "scripts": {
-    "coverage": "nyc report && nyc check-coverage",
+    "fix": "standard --fix",
+    "coverage": "c8 --check-coverage report",
     "pretest": "standard",
-    "test": "nyc mocha"
+    "test": "c8 mocha"
   },
   "devDependencies": {
+    "c8": "^7.3.0",
     "chai": "^4.0.1",
     "mocha": "^8.0.0",
-    "nyc": "^15.1.0",
     "rimraf": "^3.0.2",
-    "standard": "^10.0.0-beta.0"
+    "standard": "^14.3.4"
   },
   "engines": {
     "node": ">=10"
diff --git a/test/y18n-test.js b/test/y18n-test.js
index 2ef27377..e96e8e69 100644
--- a/test/y18n-test.js
+++ b/test/y18n-test.js
@@ -11,7 +11,7 @@ require('chai').should()
 describe('y18n', function () {
   describe('configure', function () {
     it('allows you to override the default y18n configuration', function () {
-      var y = y18n({locale: 'fr'})
+      var y = y18n({ locale: 'fr' })
       y.locale.should.equal('fr')
     })
   })

From e037d0be165f1acd7fe899fa43e43ba6d0c7cc8f Mon Sep 17 00:00:00 2001
From: QmarkC <curtis@qmarkc.com>
Date: Wed, 5 Aug 2020 01:00:29 -0500
Subject: [PATCH 09/39] docs: correct examples in README (#94)

---
 README.md | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/README.md b/README.md
index b80abac5..2d0b6cca 100644
--- a/README.md
+++ b/README.md
@@ -13,9 +13,9 @@ Inspired by [i18n](https://www.npmjs.com/package/i18n).
 _simple string translation:_
 
 ```js
-var __ = require('y18n').__
+const __ = require('y18n')().__;
 
-console.log(__('my awesome string %s', 'foo'))
+console.log(__('my awesome string %s', 'foo'));
 ```
 
 output:
@@ -25,10 +25,11 @@ output:
 _using tagged template literals_
 
 ```js
-var __ = require('y18n').__
-var str = 'foo'
+const __ = require('y18n')().__;
 
-console.log(__`my awesome string ${str}`)
+const str = 'foo';
+
+console.log(__`my awesome string ${str}`);
 ```
 
 output:
@@ -38,9 +39,9 @@ output:
 _pluralization support:_
 
 ```js
-var __n = require('y18n').__n
+const __n = require('y18n')().__n;
 
-console.log(__n('one fish %s', '%d fishes %s', 2, 'foo'))
+console.log(__n('one fish %s', '%d fishes %s', 2, 'foo'));
 ```
 
 output:

From 4d7ae94bcb42e84164e2180366474b1cd321ed94 Mon Sep 17 00:00:00 2001
From: "Benjamin E. Coe" <bencoe@google.com>
Date: Fri, 4 Sep 2020 17:20:51 -0700
Subject: [PATCH 10/39] feat: add support for ESM and Deno #95)

BREAKING CHANGE: exports maps are now used, which modifies import behavior.
---
 .eslintrc                            |  21 +++
 .github/workflows/ci.yaml            |  22 +++
 .github/workflows/release-please.yml |  32 +++-
 .gitignore                           |   2 +
 .nvmrc                               |   1 -
 README.md                            |  17 ++
 deno.ts                              |   9 ++
 index.js                             | 188 ----------------------
 index.mjs                            |   8 +
 lib/cjs.ts                           |   8 +
 lib/index.ts                         | 227 +++++++++++++++++++++++++++
 lib/platform-shims/deno.ts           |  34 ++++
 lib/platform-shims/node.ts           |  19 +++
 package.json                         |  45 +++++-
 rollup.config.js                     |  22 +++
 test/deno/y18n-test.ts               |  19 +++
 test/esm/y18n-test.mjs               |  18 +++
 test/{y18n-test.js => y18n-test.cjs} |  13 +-
 tsconfig.json                        |  17 ++
 tsconfig.test.json                   |   9 ++
 20 files changed, 526 insertions(+), 205 deletions(-)
 create mode 100644 .eslintrc
 delete mode 100644 .nvmrc
 create mode 100644 deno.ts
 delete mode 100644 index.js
 create mode 100644 index.mjs
 create mode 100644 lib/cjs.ts
 create mode 100644 lib/index.ts
 create mode 100644 lib/platform-shims/deno.ts
 create mode 100644 lib/platform-shims/node.ts
 create mode 100644 rollup.config.js
 create mode 100644 test/deno/y18n-test.ts
 create mode 100644 test/esm/y18n-test.mjs
 rename test/{y18n-test.js => y18n-test.cjs} (98%)
 create mode 100644 tsconfig.json
 create mode 100644 tsconfig.test.json

diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 00000000..5ce8c64a
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,21 @@
+{
+  "overrides": [
+    {
+      "files": "*.ts",
+      "parser": "@typescript-eslint/parser",
+      "rules": {
+        "no-unused-vars": "off",
+        "no-useless-constructor": "off",
+        "@typescript-eslint/no-unused-vars": "error",
+        "@typescript-eslint/no-useless-constructor": "error"
+      }
+    }
+  ],
+  "parserOptions": {
+    "ecmaVersion": 2017,
+    "sourceType": "module"
+  },
+  "plugins": [
+    "@typescript-eslint/eslint-plugin"
+  ]
+}
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 18714f3a..a423c85b 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -39,3 +39,25 @@ jobs:
       - run: npm install
       - run: npm test
       - run: npm run coverage
+  esm:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: '14.x'
+      - run: npm install
+      - run: npm run test:esm
+  deno:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 14
+      - run: npm install
+      - run: npm run compile
+      - uses: denolib/setup-deno@v2
+      - run: |
+          deno --version
+          deno test --allow-read test/deno/y18n-test.ts
diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index 38ace4d2..2fdb8216 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -7,8 +7,38 @@ jobs:
   release-please:
     runs-on: ubuntu-latest
     steps:
-      - uses: GoogleCloudPlatform/release-please-action@v1.6.3
+      - uses: bcoe/release-please-action@v2.0.0
+        id: release
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           release-type: node
           package-name: y18n
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 14
+      - run: npm install
+      - run: npm run compile
+      - name: push Deno release
+        run: |
+          git config user.name github-actions[bot]
+          git config user.email 41898282+github-actions[bot]@users.noreply.github.com
+          git remote add gh-token "https://${{ secrets.GITHUB_TOKEN}}@github.com/yargs/y18n.git"
+          git checkout -b deno
+          git add -f build
+          git commit -a -m 'chore: ${{ steps.release.outputs.tag_name }} release'
+          git push origin +deno
+          git tag -a ${{ steps.release.outputs.tag_name }}-deno -m 'chore: ${{ steps.release.outputs.tag_name }} release'
+          git push origin ${{ steps.release.outputs.tag_name }}-deno
+        if: ${{ steps.release.outputs.release_created }}
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 14
+          registry-url: 'https://external-dot-oss-automation.appspot.com/'
+        if: ${{ steps.release.outputs.release_created }}
+      - run: npm install
+        if: ${{ steps.release.outputs.release_created }}
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}
+        if: ${{ steps.release.outputs.release_created }}
diff --git a/.gitignore b/.gitignore
index 20bf8fcb..6430fa79 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,7 @@
 .DS_Store
 node_modules
 .nyc_output
+build
 coverage
 package-lock.json
+example.*
diff --git a/.nvmrc b/.nvmrc
deleted file mode 100644
index b009dfb9..00000000
--- a/.nvmrc
+++ /dev/null
@@ -1 +0,0 @@
-lts/*
diff --git a/README.md b/README.md
index 2d0b6cca..5102bb17 100644
--- a/README.md
+++ b/README.md
@@ -48,6 +48,23 @@ output:
 
 `2 fishes foo`
 
+## Deno Example
+
+As of `v5` `y18n` supports [Deno](https://github.com/denoland/deno):
+
+```typescript
+import y18n from "https://deno.land/x/y18n/deno.ts";
+
+const __ = y18n({
+  locale: 'pirate',
+  directory: './test/locales'
+}).__
+
+console.info(__`Hi, ${'Ben'} ${'Coe'}!`)
+```
+
+You will need to run with `--allow-read` to load alternative locales.
+
 ## JSON Language Files
 
 The JSON language files should be stored in a `./locales` folder.
diff --git a/deno.ts b/deno.ts
new file mode 100644
index 00000000..b743c4f2
--- /dev/null
+++ b/deno.ts
@@ -0,0 +1,9 @@
+import { y18n as _y18n } from './build/lib/index.js'
+import { Y18NOpts } from './build/lib/index.d.ts'
+import shim from './lib/platform-shims/deno.ts'
+
+const y18n = (opts: Y18NOpts) => {
+  return _y18n(opts, shim)
+}
+
+export default y18n
diff --git a/index.js b/index.js
deleted file mode 100644
index d7206816..00000000
--- a/index.js
+++ /dev/null
@@ -1,188 +0,0 @@
-var fs = require('fs')
-var path = require('path')
-var util = require('util')
-
-function Y18N (opts) {
-  // configurable options.
-  opts = opts || {}
-  this.directory = opts.directory || './locales'
-  this.updateFiles = typeof opts.updateFiles === 'boolean' ? opts.updateFiles : true
-  this.locale = opts.locale || 'en'
-  this.fallbackToLanguage = typeof opts.fallbackToLanguage === 'boolean' ? opts.fallbackToLanguage : true
-
-  // internal stuff.
-  this.cache = {}
-  this.writeQueue = []
-}
-
-Y18N.prototype.__ = function () {
-  if (typeof arguments[0] !== 'string') {
-    return this._taggedLiteral.apply(this, arguments)
-  }
-  var args = Array.prototype.slice.call(arguments)
-  var str = args.shift()
-  var cb = function () {} // start with noop.
-
-  if (typeof args[args.length - 1] === 'function') cb = args.pop()
-  cb = cb || function () {} // noop.
-
-  if (!this.cache[this.locale]) this._readLocaleFile()
-
-  // we've observed a new string, update the language file.
-  if (!this.cache[this.locale][str] && this.updateFiles) {
-    this.cache[this.locale][str] = str
-
-    // include the current directory and locale,
-    // since these values could change before the
-    // write is performed.
-    this._enqueueWrite([this.directory, this.locale, cb])
-  } else {
-    cb()
-  }
-
-  return util.format.apply(util, [this.cache[this.locale][str] || str].concat(args))
-}
-
-Y18N.prototype._taggedLiteral = function (parts) {
-  var args = arguments
-  var str = ''
-  parts.forEach(function (part, i) {
-    var arg = args[i + 1]
-    str += part
-    if (typeof arg !== 'undefined') {
-      str += '%s'
-    }
-  })
-  return this.__.apply(null, [str].concat([].slice.call(arguments, 1)))
-}
-
-Y18N.prototype._enqueueWrite = function (work) {
-  this.writeQueue.push(work)
-  if (this.writeQueue.length === 1) this._processWriteQueue()
-}
-
-Y18N.prototype._processWriteQueue = function () {
-  var _this = this
-  var work = this.writeQueue[0]
-
-  // destructure the enqueued work.
-  var directory = work[0]
-  var locale = work[1]
-  var cb = work[2]
-
-  var languageFile = this._resolveLocaleFile(directory, locale)
-  var serializedLocale = JSON.stringify(this.cache[locale], null, 2)
-
-  fs.writeFile(languageFile, serializedLocale, 'utf-8', function (err) {
-    _this.writeQueue.shift()
-    if (_this.writeQueue.length > 0) _this._processWriteQueue()
-    cb(err)
-  })
-}
-
-Y18N.prototype._readLocaleFile = function () {
-  var localeLookup = {}
-  var languageFile = this._resolveLocaleFile(this.directory, this.locale)
-
-  try {
-    localeLookup = JSON.parse(fs.readFileSync(languageFile, 'utf-8'))
-  } catch (err) {
-    if (err instanceof SyntaxError) {
-      err.message = 'syntax error in ' + languageFile
-    }
-
-    if (err.code === 'ENOENT') localeLookup = {}
-    else throw err
-  }
-
-  this.cache[this.locale] = localeLookup
-}
-
-Y18N.prototype._resolveLocaleFile = function (directory, locale) {
-  var file = path.resolve(directory, './', locale + '.json')
-  if (this.fallbackToLanguage && !this._fileExistsSync(file) && ~locale.lastIndexOf('_')) {
-    // attempt fallback to language only
-    var languageFile = path.resolve(directory, './', locale.split('_')[0] + '.json')
-    if (this._fileExistsSync(languageFile)) file = languageFile
-  }
-  return file
-}
-
-// this only exists because fs.existsSync() "will be deprecated"
-// see https://nodejs.org/api/fs.html#fs_fs_existssync_path
-Y18N.prototype._fileExistsSync = function (file) {
-  try {
-    return fs.statSync(file).isFile()
-  } catch (err) {
-    return false
-  }
-}
-
-Y18N.prototype.__n = function () {
-  var args = Array.prototype.slice.call(arguments)
-  var singular = args.shift()
-  var plural = args.shift()
-  var quantity = args.shift()
-
-  var cb = function () {} // start with noop.
-  if (typeof args[args.length - 1] === 'function') cb = args.pop()
-
-  if (!this.cache[this.locale]) this._readLocaleFile()
-
-  var str = quantity === 1 ? singular : plural
-  if (this.cache[this.locale][singular]) {
-    str = this.cache[this.locale][singular][quantity === 1 ? 'one' : 'other']
-  }
-
-  // we've observed a new string, update the language file.
-  if (!this.cache[this.locale][singular] && this.updateFiles) {
-    this.cache[this.locale][singular] = {
-      one: singular,
-      other: plural
-    }
-
-    // include the current directory and locale,
-    // since these values could change before the
-    // write is performed.
-    this._enqueueWrite([this.directory, this.locale, cb])
-  } else {
-    cb()
-  }
-
-  // if a %d placeholder is provided, add quantity
-  // to the arguments expanded by util.format.
-  var values = [str]
-  if (~str.indexOf('%d')) values.push(quantity)
-
-  return util.format.apply(util, values.concat(args))
-}
-
-Y18N.prototype.setLocale = function (locale) {
-  this.locale = locale
-}
-
-Y18N.prototype.getLocale = function () {
-  return this.locale
-}
-
-Y18N.prototype.updateLocale = function (obj) {
-  if (!this.cache[this.locale]) this._readLocaleFile()
-
-  for (var key in obj) {
-    this.cache[this.locale][key] = obj[key]
-  }
-}
-
-module.exports = function (opts) {
-  var y18n = new Y18N(opts)
-
-  // bind all functions to y18n, so that
-  // they can be used in isolation.
-  for (var key in y18n) {
-    if (typeof y18n[key] === 'function') {
-      y18n[key] = y18n[key].bind(y18n)
-    }
-  }
-
-  return y18n
-}
diff --git a/index.mjs b/index.mjs
new file mode 100644
index 00000000..46c82133
--- /dev/null
+++ b/index.mjs
@@ -0,0 +1,8 @@
+import shim from './build/lib/platform-shims/node.js'
+import { y18n as _y18n } from './build/lib/index.js'
+
+const y18n = (opts) => {
+  return _y18n(opts, shim)
+}
+
+export default y18n
diff --git a/lib/cjs.ts b/lib/cjs.ts
new file mode 100644
index 00000000..1ba6a58c
--- /dev/null
+++ b/lib/cjs.ts
@@ -0,0 +1,8 @@
+import { y18n as _y18n, Y18NOpts } from './index.js'
+import nodePlatformShim from './platform-shims/node.js'
+
+const y18n = (opts: Y18NOpts) => {
+  return _y18n(opts, nodePlatformShim)
+}
+
+export default y18n
diff --git a/lib/index.ts b/lib/index.ts
new file mode 100644
index 00000000..864cbac2
--- /dev/null
+++ b/lib/index.ts
@@ -0,0 +1,227 @@
+export interface Y18NOpts {
+  directory?: string;
+  updateFiles?: boolean;
+  locale?: string;
+  fallbackToLanguage?: boolean;
+}
+
+interface Work {
+  directory: string;
+  locale: string;
+  cb: Function
+}
+
+export interface Locale {
+  [key: string]: string
+}
+
+interface CacheEntry {
+  [key: string]: string;
+}
+
+export interface PlatformShim {
+  fs: {
+    readFileSync: Function,
+    writeFile: Function
+  },
+  exists: Function,
+  format: Function,
+  resolve: Function
+}
+
+let shim: PlatformShim
+class Y18N {
+  directory: string;
+  updateFiles: boolean;
+  locale: string;
+  fallbackToLanguage: boolean;
+  writeQueue: Work[];
+  cache: {[key: string]: {[key: string]: CacheEntry|string}};
+
+  constructor (opts: Y18NOpts) {
+    // configurable options.
+    opts = opts || {}
+    this.directory = opts.directory || './locales'
+    this.updateFiles = typeof opts.updateFiles === 'boolean' ? opts.updateFiles : true
+    this.locale = opts.locale || 'en'
+    this.fallbackToLanguage = typeof opts.fallbackToLanguage === 'boolean' ? opts.fallbackToLanguage : true
+
+    // internal stuff.
+    this.cache = {}
+    this.writeQueue = []
+  }
+
+  __ (...args: (string|Function)[]): string {
+    if (typeof arguments[0] !== 'string') {
+      return this._taggedLiteral(arguments[0] as string[], ...arguments)
+    }
+    const str: string = args.shift() as string
+
+    let cb: Function = function () {} // start with noop.
+    if (typeof args[args.length - 1] === 'function') cb = (args.pop() as Function)
+    cb = cb || function () {} // noop.
+
+    if (!this.cache[this.locale]) this._readLocaleFile()
+
+    // we've observed a new string, update the language file.
+    if (!this.cache[this.locale][str] && this.updateFiles) {
+      this.cache[this.locale][str] = str
+
+      // include the current directory and locale,
+      // since these values could change before the
+      // write is performed.
+      this._enqueueWrite({
+        directory: this.directory,
+        locale: this.locale,
+        cb
+      })
+    } else {
+      cb()
+    }
+
+    return shim.format.apply(shim.format, [this.cache[this.locale][str] || str].concat(args as string[]))
+  }
+
+  __n () {
+    const args = Array.prototype.slice.call(arguments)
+    const singular: string = args.shift()
+    const plural: string = args.shift()
+    const quantity: number = args.shift()
+
+    let cb = function () {} // start with noop.
+    if (typeof args[args.length - 1] === 'function') cb = args.pop()
+
+    if (!this.cache[this.locale]) this._readLocaleFile()
+
+    let str = quantity === 1 ? singular : plural
+    if (this.cache[this.locale][singular]) {
+      const entry = this.cache[this.locale][singular] as CacheEntry
+      str = entry[quantity === 1 ? 'one' : 'other']
+    }
+
+    // we've observed a new string, update the language file.
+    if (!this.cache[this.locale][singular] && this.updateFiles) {
+      this.cache[this.locale][singular] = {
+        one: singular,
+        other: plural
+      }
+
+      // include the current directory and locale,
+      // since these values could change before the
+      // write is performed.
+      this._enqueueWrite({
+        directory: this.directory,
+        locale: this.locale,
+        cb
+      })
+    } else {
+      cb()
+    }
+
+    // if a %d placeholder is provided, add quantity
+    // to the arguments expanded by util.format.
+    var values: (string|number)[] = [str]
+    if (~str.indexOf('%d')) values.push(quantity)
+
+    return shim.format.apply(shim.format, values.concat(args))
+  }
+
+  setLocale (locale: string) {
+    this.locale = locale
+  }
+
+  getLocale () {
+    return this.locale
+  }
+
+  updateLocale (obj: Locale) {
+    if (!this.cache[this.locale]) this._readLocaleFile()
+
+    for (const key in obj) {
+      if (Object.prototype.hasOwnProperty.call(obj, key)) {
+        this.cache[this.locale][key] = obj[key]
+      }
+    }
+  }
+
+  _taggedLiteral (parts: string[], ...args: string[]) {
+    let str = ''
+    parts.forEach(function (part, i) {
+      var arg = args[i + 1]
+      str += part
+      if (typeof arg !== 'undefined') {
+        str += '%s'
+      }
+    })
+    return this.__.apply(this, [str].concat([].slice.call(args, 1)))
+  }
+
+  _enqueueWrite (work: Work) {
+    this.writeQueue.push(work)
+    if (this.writeQueue.length === 1) this._processWriteQueue()
+  }
+
+  _processWriteQueue () {
+    var _this = this
+    var work = this.writeQueue[0]
+
+    // destructure the enqueued work.
+    var directory = work.directory
+    var locale = work.locale
+    var cb = work.cb
+
+    var languageFile = this._resolveLocaleFile(directory, locale)
+    var serializedLocale = JSON.stringify(this.cache[locale], null, 2)
+
+    shim.fs.writeFile(languageFile, serializedLocale, 'utf-8', function (err: Error) {
+      _this.writeQueue.shift()
+      if (_this.writeQueue.length > 0) _this._processWriteQueue()
+      cb(err)
+    })
+  }
+
+  _readLocaleFile () {
+    var localeLookup = {}
+    var languageFile = this._resolveLocaleFile(this.directory, this.locale)
+
+    try {
+      localeLookup = JSON.parse(shim.fs.readFileSync(languageFile, 'utf-8'))
+    } catch (err) {
+      if (err instanceof SyntaxError) {
+        err.message = 'syntax error in ' + languageFile
+      }
+
+      if (err.code === 'ENOENT') localeLookup = {}
+      else throw err
+    }
+
+    this.cache[this.locale] = localeLookup
+  }
+
+  _resolveLocaleFile (directory: string, locale: string) {
+    var file = shim.resolve(directory, './', locale + '.json')
+    if (this.fallbackToLanguage && !this._fileExistsSync(file) && ~locale.lastIndexOf('_')) {
+      // attempt fallback to language only
+      var languageFile = shim.resolve(directory, './', locale.split('_')[0] + '.json')
+      if (this._fileExistsSync(languageFile)) file = languageFile
+    }
+    return file
+  }
+
+  _fileExistsSync (file: string) {
+    return shim.exists(file)
+  }
+}
+
+export function y18n (opts: Y18NOpts, _shim: PlatformShim) {
+  shim = _shim
+  const y18n = new Y18N(opts)
+  return {
+    __: y18n.__.bind(y18n),
+    __n: y18n.__n.bind(y18n),
+    setLocale: y18n.setLocale.bind(y18n),
+    getLocale: y18n.getLocale.bind(y18n),
+    updateLocale: y18n.updateLocale.bind(y18n),
+    locale: y18n.locale
+  }
+}
diff --git a/lib/platform-shims/deno.ts b/lib/platform-shims/deno.ts
new file mode 100644
index 00000000..3cd243ea
--- /dev/null
+++ b/lib/platform-shims/deno.ts
@@ -0,0 +1,34 @@
+/* global Deno */
+
+import { posix } from 'https://deno.land/std/path/mod.ts'
+import { sprintf } from 'https://deno.land/std/fmt/printf.ts'
+
+export default {
+  fs: {
+    readFileSync: (path: string) => {
+      try {
+        return Deno.readTextFileSync(path)
+      } catch (err) {
+        // Fake the same error as Node.js, so that it does not bubble.
+        err.code = 'ENOENT'
+        throw err
+      }
+    },
+    writeFile: Deno.writeFile
+  },
+  format: sprintf,
+  resolve: (base: string, p1: string, p2: string) => {
+    try {
+      return posix.resolve(base, p1, p2)
+    } catch (err) {
+      // Most likely we simply don't have --allow-read set.
+    }
+  },
+  exists: (file: string) => {
+    try {
+      return Deno.statSync(file).isFile
+    } catch (err) {
+      return false
+    }
+  }
+}
diff --git a/lib/platform-shims/node.ts b/lib/platform-shims/node.ts
new file mode 100644
index 00000000..2d40e7b7
--- /dev/null
+++ b/lib/platform-shims/node.ts
@@ -0,0 +1,19 @@
+import { readFileSync, statSync, writeFile } from 'fs'
+import { format } from 'util'
+import { resolve } from 'path'
+
+export default {
+  fs: {
+    readFileSync,
+    writeFile
+  },
+  format,
+  resolve,
+  exists: (file: string) => {
+    try {
+      return statSync(file).isFile()
+    } catch (err) {
+      return false
+    }
+  }
+}
diff --git a/package.json b/package.json
index ad989b65..df422086 100644
--- a/package.json
+++ b/package.json
@@ -2,6 +2,13 @@
   "name": "y18n",
   "version": "4.0.0",
   "description": "the bare-bones internationalization library used by yargs",
+  "exports": {
+    "import": "./index.mjs",
+    "require": "./build/index.cjs"
+  },
+  "type": "module",
+  "module": "./build/lib/index.js",
+  "types": "./build/index.cjs.d.ts",
   "keywords": [
     "i18n",
     "internationalization",
@@ -18,23 +25,45 @@
   "license": "ISC",
   "author": "Ben Coe <bencoe@gmail.com>",
   "main": "index.js",
-  "files": [
-    "index.js"
-  ],
   "scripts": {
-    "fix": "standard --fix",
-    "coverage": "c8 --check-coverage report",
-    "pretest": "standard",
-    "test": "c8 mocha"
+    "check": "standardx '**/*.ts' '**/*.cjs' '**/*.mjs'",
+    "fix": "standardx --fix '**/*.ts' '**/*.cjs' '**/*.mjs'",
+    "pretest": "rimraf build && tsc -p tsconfig.test.json && cross-env NODE_ENV=test npm run build:cjs",
+    "test": "c8 --reporter=text --reporter=html mocha test/*.cjs",
+    "test:esm": "c8 --reporter=text --reporter=html mocha test/esm/*.mjs",
+    "posttest": "npm run check",
+    "coverage": "c8 report --check-coverage",
+    "precompile": "rimraf build",
+    "compile": "tsc",
+    "postcompile": "npm run build:cjs",
+    "build:cjs": "rollup -c",
+    "prepare": "npm run compile"
   },
   "devDependencies": {
+    "@types/node": "^14.6.4",
+    "@wessberg/rollup-plugin-ts": "^1.3.1",
     "c8": "^7.3.0",
     "chai": "^4.0.1",
+    "cross-env": "^7.0.2",
+    "gts": "^2.0.2",
     "mocha": "^8.0.0",
     "rimraf": "^3.0.2",
-    "standard": "^14.3.4"
+    "rollup": "^2.26.10",
+    "standardx": "^5.0.0",
+    "ts-transform-default-export": "^1.0.2",
+    "typescript": "^3.9.7"
   },
+  "files": [
+    "build",
+    "index.mjs",
+    "!*.d.ts"
+  ],
   "engines": {
     "node": ">=10"
+  },
+  "standardx": {
+    "ignore": [
+      "build"
+    ]
   }
 }
diff --git a/rollup.config.js b/rollup.config.js
new file mode 100644
index 00000000..537ce1e7
--- /dev/null
+++ b/rollup.config.js
@@ -0,0 +1,22 @@
+import ts from '@wessberg/rollup-plugin-ts'
+import transformDefaultExport from 'ts-transform-default-export'
+
+const output = {
+  format: 'cjs',
+  file: './build/index.cjs',
+  exports: 'default'
+}
+
+if (process.env.NODE_ENV === 'test') output.sourcemap = true
+
+export default {
+  input: './lib/cjs.ts',
+  output,
+  plugins: [
+    ts({
+      transformers: ({ program }) => ({
+        afterDeclarations: transformDefaultExport(program)
+      })
+    }),
+  ]
+}
diff --git a/test/deno/y18n-test.ts b/test/deno/y18n-test.ts
new file mode 100644
index 00000000..9b1b497c
--- /dev/null
+++ b/test/deno/y18n-test.ts
@@ -0,0 +1,19 @@
+/* global Deno */
+
+import {
+  assertEquals
+} from 'https://deno.land/std/testing/asserts.ts'
+import y18n from '../../deno.ts'
+
+// Parser:
+Deno.test('smoke test', () => {
+  const __ = y18n({
+    locale: 'pirate',
+    directory: './test/locales'
+  }).__
+
+  assertEquals(
+    __`Hi, ${'Ben'} ${'Coe'}!`,
+    'Yarr! Shiver me timbers, why \'tis Ben Coe!'
+  )
+})
diff --git a/test/esm/y18n-test.mjs b/test/esm/y18n-test.mjs
new file mode 100644
index 00000000..c8675ae7
--- /dev/null
+++ b/test/esm/y18n-test.mjs
@@ -0,0 +1,18 @@
+/* global describe, it */
+
+import * as assert from 'assert'
+import y18n from '../../index.mjs'
+
+describe('y18n', function () {
+  it('__ smoke test', function () {
+    const __ = y18n({
+      locale: 'pirate',
+      directory: './test/locales'
+    }).__
+
+    assert.strictEqual(
+      __`Hi, ${'Ben'} ${'Coe'}!`,
+      'Yarr! Shiver me timbers, why \'tis Ben Coe!'
+    )
+  })
+})
diff --git a/test/y18n-test.js b/test/y18n-test.cjs
similarity index 98%
rename from test/y18n-test.js
rename to test/y18n-test.cjs
index e96e8e69..d65b14b9 100644
--- a/test/y18n-test.js
+++ b/test/y18n-test.cjs
@@ -1,17 +1,17 @@
 /* global describe, it, after, beforeEach */
 
-var expect = require('chai').expect
-var fs = require('fs')
-var rimraf = require('rimraf')
-var y18n = require('../')
-var path = require('path')
+const expect = require('chai').expect
+const fs = require('fs')
+const rimraf = require('rimraf')
+const y18n = require('../build/index.cjs')
+const path = require('path')
 
 require('chai').should()
 
 describe('y18n', function () {
   describe('configure', function () {
     it('allows you to override the default y18n configuration', function () {
-      var y = y18n({ locale: 'fr' })
+      const y = y18n({ locale: 'fr' })
       y.locale.should.equal('fr')
     })
   })
@@ -43,7 +43,6 @@ describe('y18n', function () {
         locale: 'pirate',
         directory: path.join(__dirname, 'locales')
       }).__
-
       __`Hi, ${'Ben'} ${''}!`.should.equal('Yarr! Shiver me timbers, why \'tis Ben !')
     })
     it('uses replacements from the default locale if none is configured', function () {
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 00000000..93187451
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,17 @@
+{
+  "extends": "./node_modules/gts/tsconfig-google.json",
+  "compilerOptions": {
+    "outDir": "build",
+    "rootDir": ".",
+    "sourceMap": false,
+    "target": "es2017",
+    "moduleResolution": "node",
+    "module": "es2015"
+  },  
+  "include": [
+    "lib/**/*.ts"
+  ],
+  "exclude": [
+    "lib/platform-shims/deno.ts"
+  ]
+}
\ No newline at end of file
diff --git a/tsconfig.test.json b/tsconfig.test.json
new file mode 100644
index 00000000..b2175ed7
--- /dev/null
+++ b/tsconfig.test.json
@@ -0,0 +1,9 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "sourceMap": true
+  },
+  "exclude": [
+    "lib/platform-shims/deno.ts"
+  ]
+}

From cb3020d7a1e600c05de4f0241dd975df978fe44c Mon Sep 17 00:00:00 2001
From: bcoe <bencoe@google.com>
Date: Fri, 4 Sep 2020 17:33:26 -0700
Subject: [PATCH 11/39] build: debugging bad build

---
 .github/workflows/release-please.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index 2fdb8216..8e6931a6 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -7,7 +7,7 @@ jobs:
   release-please:
     runs-on: ubuntu-latest
     steps:
-      - uses: bcoe/release-please-action@v2.0.0
+      - uses: bcoe/release-please-action@vbd0f83e02efdd2c31be9dce8b84029901937b8c3
         id: release
         with:
           token: ${{ secrets.GITHUB_TOKEN }}

From 6545bac809a0cc70760ee6ef4db69ec6748bbbdc Mon Sep 17 00:00:00 2001
From: bcoe <bencoe@google.com>
Date: Fri, 4 Sep 2020 17:34:57 -0700
Subject: [PATCH 12/39] build: debugging bad build

---
 .github/workflows/release-please.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index 8e6931a6..95808250 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -7,7 +7,7 @@ jobs:
   release-please:
     runs-on: ubuntu-latest
     steps:
-      - uses: bcoe/release-please-action@vbd0f83e02efdd2c31be9dce8b84029901937b8c3
+      - uses: bcoe/release-please-action@bd0f83e02efdd2c31be9dce8b84029901937b8c3
         id: release
         with:
           token: ${{ secrets.GITHUB_TOKEN }}

From 2da6117cb957e1237a995a20f78ea0c99e4f620b Mon Sep 17 00:00:00 2001
From: bcoe <bencoe@google.com>
Date: Fri, 4 Sep 2020 17:38:19 -0700
Subject: [PATCH 13/39] build: debugging bad build

---
 .github/workflows/release-please.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index 95808250..954518a4 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -7,7 +7,7 @@ jobs:
   release-please:
     runs-on: ubuntu-latest
     steps:
-      - uses: bcoe/release-please-action@bd0f83e02efdd2c31be9dce8b84029901937b8c3
+      - uses: bcoe/release-please-action@2de94231038df0944a3337e28aed6265e1c3cd75
         id: release
         with:
           token: ${{ secrets.GITHUB_TOKEN }}

From 5b3d158920e2b503d7b1cf22bf53366034d25920 Mon Sep 17 00:00:00 2001
From: bcoe <bencoe@google.com>
Date: Fri, 4 Sep 2020 17:44:16 -0700
Subject: [PATCH 14/39] build: debugging bad build

---
 .github/workflows/release-please.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index 954518a4..dcb037c9 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -7,7 +7,7 @@ jobs:
   release-please:
     runs-on: ubuntu-latest
     steps:
-      - uses: bcoe/release-please-action@2de94231038df0944a3337e28aed6265e1c3cd75
+      - uses: bcoe/release-please-action@bdeb9cc0a2b91f41f878097a61b9587c86f422b3
         id: release
         with:
           token: ${{ secrets.GITHUB_TOKEN }}

From 90eda2d6b11d07b6e5fe021833a0d57f4c821db1 Mon Sep 17 00:00:00 2001
From: bcoe <bencoe@google.com>
Date: Fri, 4 Sep 2020 17:56:29 -0700
Subject: [PATCH 15/39] build: debugging bad build

---
 .github/workflows/release-please.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index dcb037c9..56da58f4 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -7,7 +7,7 @@ jobs:
   release-please:
     runs-on: ubuntu-latest
     steps:
-      - uses: bcoe/release-please-action@bdeb9cc0a2b91f41f878097a61b9587c86f422b3
+      - uses: bcoe/release-please-action@f941de91f075b1d1b343d87afb7640279182635f
         id: release
         with:
           token: ${{ secrets.GITHUB_TOKEN }}

From b9489dc3bcff1fc1729d36147ea1e048b58a2ea8 Mon Sep 17 00:00:00 2001
From: bcoe <bencoe@google.com>
Date: Fri, 4 Sep 2020 18:08:51 -0700
Subject: [PATCH 16/39] build: debugging bad build

---
 .github/workflows/release-please.yml | 2 +-
 CHANGELOG.md                         | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index 56da58f4..35322243 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -7,7 +7,7 @@ jobs:
   release-please:
     runs-on: ubuntu-latest
     steps:
-      - uses: bcoe/release-please-action@f941de91f075b1d1b343d87afb7640279182635f
+      - uses: bcoe/release-please-action@2.1.0
         id: release
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c259076a..0d6bdfe2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,7 +3,7 @@
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
 <a name="4.0.0"></a>
-# [4.0.0](https://github.com/yargs/y18n/compare/v3.2.1...v4.0.0) (2017-10-10)
+## [4.0.0](https://github.com/yargs/y18n/compare/v3.2.1...v4.0.0) (2017-10-10)
 
 
 ### Bug Fixes

From 0d90d507685717cac145fa932ebe6f27900b4605 Mon Sep 17 00:00:00 2001
From: bcoe <bencoe@google.com>
Date: Fri, 4 Sep 2020 18:14:30 -0700
Subject: [PATCH 17/39] force workflow


From 467b4b781607fc9d8e8ea4eceb08a1084efc6a29 Mon Sep 17 00:00:00 2001
From: bcoe <bencoe@google.com>
Date: Fri, 4 Sep 2020 18:45:48 -0700
Subject: [PATCH 18/39] build: use 2.x release

---
 .github/workflows/release-please.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index 35322243..83e4d180 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -7,7 +7,7 @@ jobs:
   release-please:
     runs-on: ubuntu-latest
     steps:
-      - uses: bcoe/release-please-action@2.1.0
+      - uses: bcoe/release-please-action@2.x
         id: release
         with:
           token: ${{ secrets.GITHUB_TOKEN }}

From 25d896227b6d52f312f7139276ddada29b743f78 Mon Sep 17 00:00:00 2001
From: bcoe <bencoe@google.com>
Date: Fri, 4 Sep 2020 18:47:14 -0700
Subject: [PATCH 19/39] build: fix action release tag

---
 .github/workflows/release-please.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index 83e4d180..2c35d8af 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -7,7 +7,7 @@ jobs:
   release-please:
     runs-on: ubuntu-latest
     steps:
-      - uses: bcoe/release-please-action@2.x
+      - uses: bcoe/release-please-action@v2.1.0
         id: release
         with:
           token: ${{ secrets.GITHUB_TOKEN }}

From 1a5852ab157124e270970509a2701bbe0623e923 Mon Sep 17 00:00:00 2001
From: "renovate[bot]" <29139614+renovate[bot]@users.noreply.github.com>
Date: Fri, 4 Sep 2020 19:06:19 -0700
Subject: [PATCH 20/39] chore(deps): update dependency typescript to v4 (#97)

Co-authored-by: Renovate Bot <bot@renovateapp.com>
---
 package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package.json b/package.json
index df422086..92a297ef 100644
--- a/package.json
+++ b/package.json
@@ -51,7 +51,7 @@
     "rollup": "^2.26.10",
     "standardx": "^5.0.0",
     "ts-transform-default-export": "^1.0.2",
-    "typescript": "^3.9.7"
+    "typescript": "^4.0.0"
   },
   "files": [
     "build",

From b28463122cf0018724075c2604900ee5e2cdd35a Mon Sep 17 00:00:00 2001
From: bcoe <bencoe@google.com>
Date: Fri, 4 Sep 2020 19:20:17 -0700
Subject: [PATCH 21/39] build: experiment with label for kicking off build

---
 .github/workflows/ci.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index a423c85b..5959957d 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -4,6 +4,7 @@ on:
     branches:
       - master
   pull_request:
+    types: [ assigned, opened, synchronize, reopened, labeled ]
 env:
   CI: true
 jobs:

From f2beb1ea02532b8508a696bbc0407f32c1e89599 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
 <41898282+github-actions[bot]@users.noreply.github.com>
Date: Fri, 4 Sep 2020 19:28:00 -0700
Subject: [PATCH 22/39] chore: release 5.0.0 (#91)

---
 CHANGELOG.md | 18 +++++++++++++++++-
 package.json |  2 +-
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0d6bdfe2..27c75c41 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,23 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
-<a name="4.0.0"></a>
+## [5.0.0](https://www.github.com/yargs/y18n/compare/v4.0.0...v5.0.0) (2020-09-05)
+
+
+### ⚠ BREAKING CHANGES
+
+* exports maps are now used, which modifies import behavior.
+* drops Node 6 and 4. begin following Node.js LTS schedule (#89)
+
+### Features
+
+* add support for ESM and Deno [#95](https://www.github.com/yargs/y18n/issues/95)) ([4d7ae94](https://www.github.com/yargs/y18n/commit/4d7ae94bcb42e84164e2180366474b1cd321ed94))
+
+
+### Build System
+
+* drops Node 6 and 4. begin following Node.js LTS schedule ([#89](https://www.github.com/yargs/y18n/issues/89)) ([3cc0c28](https://www.github.com/yargs/y18n/commit/3cc0c287240727b84eaf1927f903612ec80f5e43))
+
 ## [4.0.0](https://github.com/yargs/y18n/compare/v3.2.1...v4.0.0) (2017-10-10)
 
 
diff --git a/package.json b/package.json
index 92a297ef..d0b99fbb 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "y18n",
-  "version": "4.0.0",
+  "version": "5.0.0",
   "description": "the bare-bones internationalization library used by yargs",
   "exports": {
     "import": "./index.mjs",

From 335133842bfa398ba34d53ae17135d2604bf3e68 Mon Sep 17 00:00:00 2001
From: bcoe <bencoe@google.com>
Date: Fri, 4 Sep 2020 19:30:50 -0700
Subject: [PATCH 23/39] build: switch package.json to format supported by
 wombat

---
 package.json | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/package.json b/package.json
index d0b99fbb..805f6f65 100644
--- a/package.json
+++ b/package.json
@@ -18,10 +18,7 @@
   "bugs": {
     "url": "https://github.com/yargs/y18n/issues"
   },
-  "repository": {
-    "type": "git",
-    "url": "git@github.com:yargs/y18n.git"
-  },
+  "repository": "yargs/y18n",
   "license": "ISC",
   "author": "Ben Coe <bencoe@gmail.com>",
   "main": "index.js",

From 124f7b047ba9596bdbdf64459988304e77f3de1b Mon Sep 17 00:00:00 2001
From: "Benjamin E. Coe" <bencoe@google.com>
Date: Sat, 5 Sep 2020 16:51:50 -0700
Subject: [PATCH 24/39] fix: main had old index path (#98)

---
 package.json | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/package.json b/package.json
index 805f6f65..78e772b9 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,6 @@
   },
   "type": "module",
   "module": "./build/lib/index.js",
-  "types": "./build/index.cjs.d.ts",
   "keywords": [
     "i18n",
     "internationalization",
@@ -21,7 +20,7 @@
   "repository": "yargs/y18n",
   "license": "ISC",
   "author": "Ben Coe <bencoe@gmail.com>",
-  "main": "index.js",
+  "main": "./build/index.cjs",
   "scripts": {
     "check": "standardx '**/*.ts' '**/*.cjs' '**/*.mjs'",
     "fix": "standardx --fix '**/*.ts' '**/*.cjs' '**/*.mjs'",

From 9c8a079a2917b71dd55086233f4272da521fc600 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
 <41898282+github-actions[bot]@users.noreply.github.com>
Date: Sat, 5 Sep 2020 16:56:24 -0700
Subject: [PATCH 25/39] chore: release 5.0.1 (#99)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 CHANGELOG.md | 7 +++++++
 package.json | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 27c75c41..e6d63df0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+### [5.0.1](https://www.github.com/yargs/y18n/compare/v5.0.0...v5.0.1) (2020-09-05)
+
+
+### Bug Fixes
+
+* main had old index path ([#98](https://www.github.com/yargs/y18n/issues/98)) ([124f7b0](https://www.github.com/yargs/y18n/commit/124f7b047ba9596bdbdf64459988304e77f3de1b))
+
 ## [5.0.0](https://www.github.com/yargs/y18n/compare/v4.0.0...v5.0.0) (2020-09-05)
 
 
diff --git a/package.json b/package.json
index 78e772b9..62f695e1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "y18n",
-  "version": "5.0.0",
+  "version": "5.0.1",
   "description": "the bare-bones internationalization library used by yargs",
   "exports": {
     "import": "./index.mjs",

From 3834d9ab1332f2937c935ada5e76623290efae81 Mon Sep 17 00:00:00 2001
From: Luke John <github@lukejohn.me>
Date: Fri, 2 Oct 2020 02:08:55 +0800
Subject: [PATCH 26/39] fix(deno): update types for deno ^1.4.0 (#100)

In version 1.4 Deno adopted;

- the tsconfig setting [importsNotUsedAsValues](https://www.typescriptlang.org/tsconfig#importsNotUsedAsValues) - https://github.com/denoland/deno/pull/7413

This requires the use of;
- type only imports for values which are only used as types (`importsNotUsedAsValues`)
---
 deno.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/deno.ts b/deno.ts
index b743c4f2..feae3e4f 100644
--- a/deno.ts
+++ b/deno.ts
@@ -1,5 +1,5 @@
 import { y18n as _y18n } from './build/lib/index.js'
-import { Y18NOpts } from './build/lib/index.d.ts'
+import type { Y18NOpts } from './build/lib/index.d.ts'
 import shim from './lib/platform-shims/deno.ts'
 
 const y18n = (opts: Y18NOpts) => {

From fd0e21a8adb303142d9f160615e75ce847bd415a Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
 <41898282+github-actions[bot]@users.noreply.github.com>
Date: Thu, 1 Oct 2020 11:21:45 -0700
Subject: [PATCH 27/39] chore: release 5.0.2 (#101)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 CHANGELOG.md | 7 +++++++
 package.json | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index e6d63df0..8d85a890 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+### [5.0.2](https://www.github.com/yargs/y18n/compare/v5.0.1...v5.0.2) (2020-10-01)
+
+
+### Bug Fixes
+
+* **deno:** update types for deno ^1.4.0 ([#100](https://www.github.com/yargs/y18n/issues/100)) ([3834d9a](https://www.github.com/yargs/y18n/commit/3834d9ab1332f2937c935ada5e76623290efae81))
+
 ### [5.0.1](https://www.github.com/yargs/y18n/compare/v5.0.0...v5.0.1) (2020-09-05)
 
 
diff --git a/package.json b/package.json
index 62f695e1..424f8638 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "y18n",
-  "version": "5.0.1",
+  "version": "5.0.2",
   "description": "the bare-bones internationalization library used by yargs",
   "exports": {
     "import": "./index.mjs",

From bbf3bfdb1c24f89e8e8132abb88a832becdf9bf0 Mon Sep 17 00:00:00 2001
From: "renovate[bot]" <29139614+renovate[bot]@users.noreply.github.com>
Date: Wed, 14 Oct 2020 12:18:49 -0700
Subject: [PATCH 28/39] chore(deps): update dependency gts to v3 (#102)

Co-authored-by: Renovate Bot <bot@renovateapp.com>
---
 package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package.json b/package.json
index 424f8638..35d97d43 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,7 @@
     "c8": "^7.3.0",
     "chai": "^4.0.1",
     "cross-env": "^7.0.2",
-    "gts": "^2.0.2",
+    "gts": "^3.0.0",
     "mocha": "^8.0.0",
     "rimraf": "^3.0.2",
     "rollup": "^2.26.10",

From 091c7cd2f7ff770d00b045a107d2c727b56dfc5d Mon Sep 17 00:00:00 2001
From: bcoe <bencoe@google.com>
Date: Wed, 14 Oct 2020 12:21:39 -0700
Subject: [PATCH 29/39] build: newest version of action

---
 .github/workflows/release-please.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index 2c35d8af..b9a3b136 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -7,7 +7,7 @@ jobs:
   release-please:
     runs-on: ubuntu-latest
     steps:
-      - uses: bcoe/release-please-action@v2.1.0
+      - uses: bcoe/release-please-action@v2.5.5
         id: release
         with:
           token: ${{ secrets.GITHUB_TOKEN }}

From e39921e1017f88f5d8ea97ddea854ffe92d68e74 Mon Sep 17 00:00:00 2001
From: Jordan Harband <ljharb@gmail.com>
Date: Thu, 15 Oct 2020 18:31:53 -0700
Subject: [PATCH 30/39] fix(exports): node 13.0-13.6 require a string fallback
 (#103)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

package.json’s "engines" field claims yargs-parser supports node >= 10; node v13.0-v13.6 are included in this semver range. This change is required to be able to require() from yargs-parser successfully in these versions.

See https://github.com/yargs/yargs/pull/1776
---
 package.json | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/package.json b/package.json
index 35d97d43..420d52f8 100644
--- a/package.json
+++ b/package.json
@@ -2,10 +2,13 @@
   "name": "y18n",
   "version": "5.0.2",
   "description": "the bare-bones internationalization library used by yargs",
-  "exports": {
-    "import": "./index.mjs",
-    "require": "./build/index.cjs"
-  },
+  "exports": [
+    {
+      "import": "./index.mjs",
+      "require": "./build/index.cjs"
+    },
+    "./build/index.cjs"
+  ],
   "type": "module",
   "module": "./build/lib/index.js",
   "keywords": [

From 3c4e24168c650b4a4a2facd68744c701780b60a9 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
 <41898282+github-actions[bot]@users.noreply.github.com>
Date: Thu, 15 Oct 2020 18:50:41 -0700
Subject: [PATCH 31/39] chore: release 5.0.3 (#104)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 CHANGELOG.md | 7 +++++++
 package.json | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8d85a890..19f14b02 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+### [5.0.3](https://www.github.com/yargs/y18n/compare/v5.0.2...v5.0.3) (2020-10-16)
+
+
+### Bug Fixes
+
+* **exports:** node 13.0-13.6 require a string fallback ([#103](https://www.github.com/yargs/y18n/issues/103)) ([e39921e](https://www.github.com/yargs/y18n/commit/e39921e1017f88f5d8ea97ddea854ffe92d68e74))
+
 ### [5.0.2](https://www.github.com/yargs/y18n/compare/v5.0.1...v5.0.2) (2020-10-01)
 
 
diff --git a/package.json b/package.json
index 420d52f8..9854a5bd 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "y18n",
-  "version": "5.0.2",
+  "version": "5.0.3",
   "description": "the bare-bones internationalization library used by yargs",
   "exports": [
     {

From 4f85d80dbaae6d2c7899ae394f7ad97805df4886 Mon Sep 17 00:00:00 2001
From: Jordan Harband <ljharb@gmail.com>
Date: Thu, 15 Oct 2020 22:49:52 -0700
Subject: [PATCH 32/39] fix(exports): node 13.0 and 13.1 require the dotted
 object form _with_ a string fallback (#105)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

package.json’s "engines" field claims yargs-parser supports node >= 10; node v13.0 and v13.1 are included in this semver range. This change is required to be able to require() from yargs-parser successfully in these versions.

See https://github.com/yargs/yargs/pull/1776
---
 package.json | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/package.json b/package.json
index 9854a5bd..5632b4c6 100644
--- a/package.json
+++ b/package.json
@@ -2,13 +2,15 @@
   "name": "y18n",
   "version": "5.0.3",
   "description": "the bare-bones internationalization library used by yargs",
-  "exports": [
-    {
-      "import": "./index.mjs",
-      "require": "./build/index.cjs"
-    },
-    "./build/index.cjs"
-  ],
+  "exports": {
+    ".": [
+      {
+        "import": "./index.mjs",
+        "require": "./build/index.cjs"
+      },
+      "./build/index.cjs"
+    ]
+  },
   "type": "module",
   "module": "./build/lib/index.js",
   "keywords": [

From 61a8b9a4c747f7482bcee7a7c134b499313ebb52 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
 <41898282+github-actions[bot]@users.noreply.github.com>
Date: Fri, 16 Oct 2020 08:43:22 -0700
Subject: [PATCH 33/39] chore: release 5.0.4 (#106)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 CHANGELOG.md | 7 +++++++
 package.json | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 19f14b02..b86ddf9d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+### [5.0.4](https://www.github.com/yargs/y18n/compare/v5.0.3...v5.0.4) (2020-10-16)
+
+
+### Bug Fixes
+
+* **exports:** node 13.0 and 13.1 require the dotted object form _with_ a string fallback ([#105](https://www.github.com/yargs/y18n/issues/105)) ([4f85d80](https://www.github.com/yargs/y18n/commit/4f85d80dbaae6d2c7899ae394f7ad97805df4886))
+
 ### [5.0.3](https://www.github.com/yargs/y18n/compare/v5.0.2...v5.0.3) (2020-10-16)
 
 
diff --git a/package.json b/package.json
index 5632b4c6..ba713184 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "y18n",
-  "version": "5.0.3",
+  "version": "5.0.4",
   "description": "the bare-bones internationalization library used by yargs",
   "exports": {
     ".": [

From a9ac604abf756dec9687be3843e2c93bfe581f25 Mon Sep 17 00:00:00 2001
From: "Benjamin E. Coe" <bencoe@google.com>
Date: Sun, 25 Oct 2020 10:59:56 -0400
Subject: [PATCH 34/39] fix: address prototype pollution issue (#108)

---
 lib/index.ts       |  2 +-
 test/y18n-test.cjs | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/lib/index.ts b/lib/index.ts
index 864cbac2..07d99e3b 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -47,7 +47,7 @@ class Y18N {
     this.fallbackToLanguage = typeof opts.fallbackToLanguage === 'boolean' ? opts.fallbackToLanguage : true
 
     // internal stuff.
-    this.cache = {}
+    this.cache = Object.create(null)
     this.writeQueue = []
   }
 
diff --git a/test/y18n-test.cjs b/test/y18n-test.cjs
index d65b14b9..a14941b1 100644
--- a/test/y18n-test.cjs
+++ b/test/y18n-test.cjs
@@ -351,6 +351,24 @@ describe('y18n', function () {
     })
   })
 
+  // See: https://github.com/yargs/y18n/issues/96,
+  // https://github.com/yargs/y18n/pull/107
+  describe('prototype pollution', () => {
+    it('does not pollute prototype, with __proto__ locale', () => {
+      const y = y18n()
+      y.setLocale('__proto__')
+      y.updateLocale({ polluted: '👽' })
+      y.__('polluted').should.equal('👽')
+      ;(typeof polluted).should.equal('undefined')
+    })
+
+    it('does not pollute prototype, when __ is used with __proto__ locale', () => {
+      const __ = y18n({ locale: '__proto__' }).__
+      __('hello')
+      ;(typeof {}.hello).should.equal('undefined')
+    })
+  })
+
   after(function () {
     rimraf.sync('./test/locales/fr.json')
   })

From b22c0df59d0851d7be9fd1d51f6a5ee974c9fc94 Mon Sep 17 00:00:00 2001
From: "Benjamin E. Coe" <bencoe@google.com>
Date: Tue, 6 Apr 2021 18:28:19 -0700
Subject: [PATCH 35/39] fix(security): ensure entry exists for backport (#120)

---
 .github/workflows/release-please.yml | 36 +++-------------------------
 .release-please-manifest.json        |  3 +++
 package.json                         |  2 +-
 release-please-config.json           |  8 +++++++
 4 files changed, 15 insertions(+), 34 deletions(-)
 create mode 100644 .release-please-manifest.json
 create mode 100644 release-please-config.json

diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index b9a3b136..d17988ef 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -1,44 +1,14 @@
 on:
    push:
      branches:
-       - master
+       - 4.x.x
 name: release-please
 jobs:
   release-please:
     runs-on: ubuntu-latest
     steps:
-      - uses: bcoe/release-please-action@v2.5.5
+      - uses: bcoe/release-please-action@v2
         id: release
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
-          release-type: node
-          package-name: y18n
-      - uses: actions/checkout@v2
-      - uses: actions/setup-node@v1
-        with:
-          node-version: 14
-      - run: npm install
-      - run: npm run compile
-      - name: push Deno release
-        run: |
-          git config user.name github-actions[bot]
-          git config user.email 41898282+github-actions[bot]@users.noreply.github.com
-          git remote add gh-token "https://${{ secrets.GITHUB_TOKEN}}@github.com/yargs/y18n.git"
-          git checkout -b deno
-          git add -f build
-          git commit -a -m 'chore: ${{ steps.release.outputs.tag_name }} release'
-          git push origin +deno
-          git tag -a ${{ steps.release.outputs.tag_name }}-deno -m 'chore: ${{ steps.release.outputs.tag_name }} release'
-          git push origin ${{ steps.release.outputs.tag_name }}-deno
-        if: ${{ steps.release.outputs.release_created }}
-      - uses: actions/setup-node@v1
-        with:
-          node-version: 14
-          registry-url: 'https://external-dot-oss-automation.appspot.com/'
-        if: ${{ steps.release.outputs.release_created }}
-      - run: npm install
-        if: ${{ steps.release.outputs.release_created }}
-      - run: npm publish
-        env:
-          NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}
-        if: ${{ steps.release.outputs.release_created }}
+          command: manifest
diff --git a/.release-please-manifest.json b/.release-please-manifest.json
new file mode 100644
index 00000000..cbecc517
--- /dev/null
+++ b/.release-please-manifest.json
@@ -0,0 +1,3 @@
+{
+  ".": "4.0.1",
+}
diff --git a/package.json b/package.json
index ba713184..8e2a64d2 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "y18n",
-  "version": "5.0.4",
+  "version": "4.0.1",
   "description": "the bare-bones internationalization library used by yargs",
   "exports": {
     ".": [
diff --git a/release-please-config.json b/release-please-config.json
new file mode 100644
index 00000000..25edcf30
--- /dev/null
+++ b/release-please-config.json
@@ -0,0 +1,8 @@
+{
+  "bootstrap-sha": "a9ac604abf756dec9687be3843e2c93bfe581f25",
+  "packages": {
+    ".": {
+      "release-type": "node"
+    }
+  }
+}

From 910ff4cada50c52e77bac7d031f257b33ff1d12d Mon Sep 17 00:00:00 2001
From: bcoe <bencoe@google.com>
Date: Tue, 6 Apr 2021 18:33:25 -0700
Subject: [PATCH 36/39] build: use appropriate releaser

---
 .github/workflows/release-please.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index d17988ef..3471b097 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -7,7 +7,7 @@ jobs:
   release-please:
     runs-on: ubuntu-latest
     steps:
-      - uses: bcoe/release-please-action@v2
+      - uses: google-github-actions/release-please-action@v2
         id: release
         with:
           token: ${{ secrets.GITHUB_TOKEN }}

From d65aef19626d17077361e9ae5c1d99af77acb078 Mon Sep 17 00:00:00 2001
From: bcoe <bencoe@google.com>
Date: Tue, 6 Apr 2021 18:35:41 -0700
Subject: [PATCH 37/39] build: add default branch

---
 .github/workflows/release-please.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index 3471b097..ad2308a3 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -12,3 +12,4 @@ jobs:
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           command: manifest
+          default-branch: 4.x.x

From af90f175857921a35a34ee293f99c845c3823859 Mon Sep 17 00:00:00 2001
From: bcoe <bencoe@google.com>
Date: Tue, 6 Apr 2021 18:36:29 -0700
Subject: [PATCH 38/39] build: fix json in manifest

---
 .release-please-manifest.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index cbecc517..cf533f28 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "4.0.1",
+  ".": "4.0.1"
 }

From bcfdd05cf8405593cd3261e25fde4976efd8672f Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
 <41898282+github-actions[bot]@users.noreply.github.com>
Date: Tue, 6 Apr 2021 18:37:25 -0700
Subject: [PATCH 39/39] chore: release (#122)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 .release-please-manifest.json | 2 +-
 CHANGELOG.md                  | 7 +++++++
 package.json                  | 2 +-
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index cf533f28..1778b2a6 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "4.0.1"
+  ".": "4.0.2"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b86ddf9d..8b42afcc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+### [4.0.2](https://www.github.com/yargs/y18n/compare/y18n-v4.0.1...y18n-v4.0.2) (2021-04-07)
+
+
+### Bug Fixes
+
+* **security:** ensure entry exists for backport ([#120](https://www.github.com/yargs/y18n/issues/120)) ([b22c0df](https://www.github.com/yargs/y18n/commit/b22c0df59d0851d7be9fd1d51f6a5ee974c9fc94))
+
 ### [5.0.4](https://www.github.com/yargs/y18n/compare/v5.0.3...v5.0.4) (2020-10-16)
 
 
diff --git a/package.json b/package.json
index 8e2a64d2..d6944aaf 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "y18n",
-  "version": "4.0.1",
+  "version": "4.0.2",
   "description": "the bare-bones internationalization library used by yargs",
   "exports": {
     ".": [