refactor: replace cosmiconfig with lilconfig

cosmiconfig is a massive package which recently got a small alternative
without dependencies lilconfig.

https://github.com/antonk52/lilconfig

https://packagephobia.com/result?p=cosmiconfig
https://packagephobia.com/result?p=lilconfig

Though still a big part of cosmiconfig is `yaml` package.
https://packagephobia.com/result?p=yaml

This package is important piece of [relay](https://github.com/facebook/relay/blob/378104f341c0682dbad646221db34fc5e0ce41c9/packages/babel-plugin-relay/package.json#L16) and [emotion](https://github.com/emotion-js/emotion/blob/242f7d8c9f3ddbba2a69664bcc0fa22501df849f/packages/babel-plugin/package.json#L22). Would be good to make it as small as possible.

other/docs/author.md

@@ -183,9 +183,9 @@ To specify that your plugin is configurable, you pass a `configName` to
 `createMacro`.
 
 A configuration is created from data combined from two sources: We use
-[`cosmiconfig`][cosmiconfig] to read a `babel-plugin-macros` configuration which
-can be located in any of the following files up the directories from the
-importing file:
+[`lilconfig`][lilconfig] to read a `babel-plugin-macros` configuration which can
+be located in any of the following files up the directories from the importing
+file:
 
 - `.babel-plugin-macrosrc`
 - `.babel-plugin-macrosrc.json`
@@ -210,15 +210,14 @@ module.exports = {
 module.exports = {
   plugins: [
     [
-      "macros",
+      'macros',
       {
-        taggedTranslations: { locale: "en_GB" },
+        taggedTranslations: {locale: 'en_GB'},
       },
     ],
   ],
 }
 
-
 // taggedTranslations.macro.js
 const {createMacro} = require('babel-plugin-macros')
 module.exports = createMacro(taggedTranslationsMacro, {
@@ -343,4 +342,4 @@ function myMacro({references, state, babel}) {
 [keyword]: https://docs.npmjs.com/files/package.json#keywords
 [npm-babel-plugin-macros]:
   https://www.npmjs.com/browse/keyword/babel-plugin-macros
-[cosmiconfig]: https://www.npmjs.com/package/cosmiconfig
+[lilconfig]: https://www.npmjs.com/package/lilconfig

other/docs/user.md

@@ -97,9 +97,9 @@ $ yarn upgrade react-scripts
 ### config
 
 There is a feature that allows you to configure your macro. We use
-[`cosmiconfig`][cosmiconfig] to read a `babel-plugin-macros` configuration which
-can be located in any of the following files up the directories from the
-importing file:
+[`lilconfig`][lilconfig] to read a `babel-plugin-macros` configuration which can
+be located in any of the following files up the directories from the importing
+file:
 
 - `.babel-plugin-macrosrc`
 - `.babel-plugin-macrosrc.json`
@@ -123,5 +123,5 @@ module.exports = {
 }
 ```
 
-[cosmiconfig]: https://www.npmjs.com/package/cosmiconfig
+[lilconfig]: https://www.npmjs.com/package/lilconfig
 [styled-components]: https://www.styled-components.com/docs/tooling#babel-macro

package.json

@@ -27,8 +27,9 @@
   "license": "MIT",
   "dependencies": {
     "@babel/runtime": "^7.12.5",
-    "cosmiconfig": "^7.0.0",
-    "resolve": "^1.19.0"
+    "lilconfig": "^2.0.4",
+    "resolve": "^1.19.0",
+    "yaml": "^1.10.2"
   },
   "devDependencies": {
     "@babel/core": "^7.12.9",

src/__tests__/__snapshots__/index.js.snap

@@ -343,7 +343,7 @@ configured\`stuff\`
 
       ↓ ↓ ↓ ↓ ↓ ↓
 
-Error: this is a cosmiconfig error
+Error: this is a lilconfig error
 
 `;
 

src/__tests__/index.js

@@ -1,20 +1,20 @@
 import path from 'path'
-import {cosmiconfigSync as cosmiconfigSyncMock} from 'cosmiconfig'
+import {lilconfigSync as lilconfigSyncMock} from 'lilconfig'
 import cpy from 'cpy'
 import babel from '@babel/core'
 import pluginTester from 'babel-plugin-tester'
 import plugin from '../'
 
 const projectRoot = path.join(__dirname, '../../')
 
-jest.mock('cosmiconfig', () => {
-  const cosmiconfigExports = jest.requireActual('cosmiconfig')
-  const actualCosmiconfigSync = cosmiconfigExports.cosmiconfigSync
-  function fakeCosmiconfigSync(...args) {
-    fakeCosmiconfigSync.explorer = actualCosmiconfigSync(...args)
-    return fakeCosmiconfigSync.explorer
+jest.mock('lilconfig', () => {
+  const lilconfigExports = jest.requireActual('lilconfig')
+  const actualLilconfigSync = lilconfigExports.lilconfigSync
+  function fakeLilconfigSync(...args) {
+    fakeLilconfigSync.explorer = actualLilconfigSync(...args)
+    return fakeLilconfigSync.explorer
   }
-  return {...cosmiconfigExports, cosmiconfigSync: fakeCosmiconfigSync}
+  return {...lilconfigExports, lilconfigSync: fakeLilconfigSync}
 })
 
 beforeAll(() => {
@@ -296,9 +296,9 @@ pluginTester({
       fixture: path.join(__dirname, 'fixtures/config/code.js'),
       setup() {
         jest
-          .spyOn(cosmiconfigSyncMock.explorer, 'search')
+          .spyOn(lilconfigSyncMock.explorer, 'search')
           .mockImplementationOnce(() => {
-            throw new Error('this is a cosmiconfig error')
+            throw new Error('this is a lilconfig error')
           })
         jest.spyOn(console, 'error').mockImplementationOnce(() => {})
         return function teardown() {
@@ -319,7 +319,7 @@ pluginTester({
       fixture: path.join(__dirname, 'fixtures/config/code.js'),
       setup() {
         jest
-          .spyOn(cosmiconfigSyncMock.explorer, 'search')
+          .spyOn(lilconfigSyncMock.explorer, 'search')
           .mockImplementationOnce(() => {
             return null
           })

src/index.js

@@ -2,6 +2,8 @@ const p = require('path')
 const resolve = require('resolve')
 // const printAST = require('ast-pretty-print')
 
+const {lilconfigSync} = require('lilconfig')
+
 const macrosRegex = /[./]macro(\.c?js)?$/
 const testMacrosRegex = v => macrosRegex.test(v)
 
@@ -19,12 +21,17 @@ class MacroError extends Error {
   }
 }
 
+function loadYaml(filepath, content) {
+  // Lazy load yaml since it is a relatively large bundle
+  const yaml = require('yaml')
+  return yaml.parse(content)
+}
+
 let _configExplorer = null
 function getConfigExplorer() {
   return (_configExplorer =
     _configExplorer ||
-    // Lazy load cosmiconfig since it is a relatively large bundle
-    require('cosmiconfig').cosmiconfigSync('babel-plugin-macros', {
+    lilconfigSync('babel-plugin-macros', {
       searchPlaces: [
         'package.json',
         '.babel-plugin-macrosrc',
@@ -35,6 +42,12 @@ function getConfigExplorer() {
         'babel-plugin-macros.config.js',
       ],
       packageProp: 'babelMacros',
+      loaders: {
+        '.yaml': loadYaml,
+        '.yml': loadYaml,
+        // loader for files with no extension
+        noExt: loadYaml,
+      },
     }))
 }