chore(libnpmdiff): added as workspace

- Setup ./packages/* as workspaces
- Moved source from: https://github.com/npm/libnpmdiff to
./packages/libnpmdiff
- Added CI target for workspaces

Relates to: npm/statusboard#362

PR-URL: #3386
Credit: @ruyadorno
Close: #3386
Reviewed-by: @wraithgar

.github/workflows/ci.yml

@@ -79,6 +79,47 @@ jobs:
       env:
         DEPLOY_VERSION: testing
 
+  workspaces-tests:
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: [10.x, 12.x, 14.x, 16.x]
+        platform:
+          - os: ubuntu-latest
+            shell: bash
+          - os: macos-latest
+            shell: bash
+          - os: windows-latest
+            shell: bash
+          - os: windows-latest
+            shell: powershell
+
+    runs-on: ${{ matrix.platform.os }}
+    defaults:
+      run:
+        shell: ${{ matrix.platform.shell }}
+
+    steps:
+      # Checkout the npm/cli repo
+    - uses: actions/checkout@v2
+
+      # Installs the specific version of Node.js
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+
+      # Run the installer script
+    - name: Install dependencies
+      run: |
+        node . install --ignore-scripts --no-audit
+        node . rebuild
+
+    - name: Run workspaces tests
+      run: node . test -w ./packages -- --no-check-coverage -t600 -Rbase -c
+      env:
+        DEPLOY_VERSION: testing
+
   build:
     strategy:
       fail-fast: false

package.json

@@ -3,7 +3,8 @@
   "name": "npm",
   "description": "a package manager for JavaScript",
   "workspaces": [
-    "docs"
+    "docs",
+    "packages/*"
   ],
   "files": [
     "bin",

packages/libnpmdiff/.eslintrc.json

@@ -0,0 +1,207 @@
+{
+  "parserOptions": {
+    "ecmaVersion": 2018,
+    "ecmaFeatures": {},
+    "sourceType": "script"
+  },
+
+  "env": {
+    "es6": true,
+    "node": true
+  },
+
+  "plugins": [
+    "import",
+    "node",
+    "promise",
+    "standard"
+  ],
+
+  "globals": {
+    "document": "readonly",
+    "navigator": "readonly",
+    "window": "readonly"
+  },
+
+  "rules": {
+    "accessor-pairs": "error",
+    "array-bracket-spacing": ["error", "never"],
+    "arrow-spacing": ["error", { "before": true, "after": true }],
+    "block-spacing": ["error", "always"],
+    "brace-style": ["error", "1tbs", { "allowSingleLine": false }],
+    "camelcase": ["error", { "properties": "never" }],
+    "comma-dangle": ["error", {
+      "arrays": "always-multiline",
+      "objects": "always-multiline",
+      "imports": "always-multiline",
+      "exports": "always-multiline",
+      "functions": "never"
+    }],
+    "comma-spacing": ["error", { "before": false, "after": true }],
+    "comma-style": ["error", "last"],
+    "computed-property-spacing": ["error", "never"],
+    "constructor-super": "error",
+    "curly": ["error", "multi-or-nest"],
+    "dot-location": ["error", "property"],
+    "dot-notation": ["error", { "allowKeywords": true }],
+    "eol-last": "error",
+    "eqeqeq": ["error", "always", { "null": "ignore" }],
+    "func-call-spacing": ["error", "never"],
+    "generator-star-spacing": ["error", { "before": true, "after": true }],
+    "handle-callback-err": ["error", "^(err|error)$" ],
+    "indent": ["error", 2, {
+      "SwitchCase": 1,
+      "VariableDeclarator": 1,
+      "outerIIFEBody": 1,
+      "MemberExpression": 1,
+      "FunctionDeclaration": { "parameters": 1, "body": 1 },
+      "FunctionExpression": { "parameters": 1, "body": 1 },
+      "CallExpression": { "arguments": 1 },
+      "ArrayExpression": 1,
+      "ObjectExpression": 1,
+      "ImportDeclaration": 1,
+      "flatTernaryExpressions": true,
+      "ignoreComments": false,
+      "ignoredNodes": ["TemplateLiteral *"]
+    }],
+    "key-spacing": ["error", { "beforeColon": false, "afterColon": true }],
+    "keyword-spacing": ["error", { "before": true, "after": true }],
+    "lines-between-class-members": ["error", "always", { "exceptAfterSingleLine": true }],
+    "new-cap": ["error", { "newIsCap": true, "capIsNew": false, "properties": true }],
+    "new-parens": "error",
+    "no-array-constructor": "error",
+    "no-async-promise-executor": "error",
+    "no-caller": "error",
+    "no-case-declarations": "error",
+    "no-class-assign": "error",
+    "no-compare-neg-zero": "error",
+    "no-cond-assign": "off",
+    "no-const-assign": "error",
+    "no-constant-condition": ["error", { "checkLoops": false }],
+    "no-control-regex": "error",
+    "no-debugger": "error",
+    "no-delete-var": "error",
+    "no-dupe-args": "error",
+    "no-dupe-class-members": "error",
+    "no-dupe-keys": "error",
+    "no-duplicate-case": "error",
+    "no-empty-character-class": "error",
+    "no-empty-pattern": "error",
+    "no-eval": "error",
+    "no-ex-assign": "error",
+    "no-extend-native": "error",
+    "no-extra-bind": "error",
+    "no-extra-boolean-cast": "error",
+    "no-extra-parens": ["error", "functions"],
+    "no-fallthrough": "error",
+    "no-floating-decimal": "error",
+    "no-func-assign": "error",
+    "no-global-assign": "error",
+    "no-implied-eval": "error",
+    "no-inner-declarations": ["error", "functions"],
+    "no-invalid-regexp": "error",
+    "no-irregular-whitespace": "error",
+    "no-iterator": "error",
+    "no-labels": ["error", { "allowLoop": true, "allowSwitch": false }],
+    "no-lone-blocks": "error",
+    "no-misleading-character-class": "error",
+    "no-prototype-builtins": "error",
+    "no-useless-catch": "error",
+    "no-mixed-operators": "off",
+    "no-mixed-spaces-and-tabs": "error",
+    "no-multi-spaces": "error",
+    "no-multi-str": "error",
+    "no-multiple-empty-lines": ["error", { "max": 1, "maxEOF": 0 }],
+    "no-negated-in-lhs": "error",
+    "no-new": "off",
+    "no-new-func": "error",
+    "no-new-object": "error",
+    "no-new-require": "error",
+    "no-new-symbol": "error",
+    "no-new-wrappers": "error",
+    "no-obj-calls": "error",
+    "no-octal": "error",
+    "no-octal-escape": "error",
+    "no-path-concat": "error",
+    "no-proto": "error",
+    "no-redeclare": ["error", { "builtinGlobals": false }],
+    "no-regex-spaces": "error",
+    "no-return-assign": "off",
+    "no-self-assign": "off",
+    "no-self-compare": "error",
+    "no-sequences": "error",
+    "no-shadow-restricted-names": "error",
+    "no-sparse-arrays": "error",
+    "no-tabs": "error",
+    "no-template-curly-in-string": "error",
+    "no-this-before-super": "error",
+    "no-throw-literal": "off",
+    "no-trailing-spaces": "error",
+    "no-undef": "error",
+    "no-undef-init": "error",
+    "no-unexpected-multiline": "error",
+    "no-unmodified-loop-condition": "error",
+    "no-unneeded-ternary": ["error", { "defaultAssignment": false }],
+    "no-unreachable": "error",
+    "no-unsafe-finally": 0,
+    "no-unsafe-negation": "error",
+    "no-unused-expressions": ["error", { "allowShortCircuit": true, "allowTernary": true, "allowTaggedTemplates": true }],
+    "no-unused-vars": ["error", { "vars": "all", "args": "none", "ignoreRestSiblings": true }],
+    "no-use-before-define": ["error", { "functions": false, "classes": false, "variables": false }],
+    "no-useless-call": "error",
+    "no-useless-computed-key": "error",
+    "no-useless-constructor": "error",
+    "no-useless-escape": "error",
+    "no-useless-rename": "error",
+    "no-useless-return": "error",
+    "no-void": "error",
+    "no-whitespace-before-property": "error",
+    "no-with": "error",
+    "nonblock-statement-body-position": [2, "below"],
+    "object-curly-newline": "off",
+    "object-curly-spacing": "off",
+    "object-property-newline": ["error", { "allowMultiplePropertiesPerLine": true }],
+    "one-var": ["error", { "initialized": "never" }],
+    "operator-linebreak": "off",
+    "padded-blocks": ["error", { "blocks": "never", "switches": "never", "classes": "never" }],
+    "prefer-const": ["error", {"destructuring": "all"}],
+    "prefer-promise-reject-errors": "error",
+    "quote-props": ["error", "as-needed"],
+    "quotes": ["error", "single", { "avoidEscape": true, "allowTemplateLiterals": true }],
+    "rest-spread-spacing": ["error", "never"],
+    "semi": ["error", "never"],
+    "semi-spacing": ["error", { "before": false, "after": true }],
+    "space-before-blocks": ["error", "always"],
+    "space-before-function-paren": ["error", "always"],
+    "space-in-parens": ["error", "never"],
+    "space-infix-ops": "error",
+    "space-unary-ops": ["error", { "words": true, "nonwords": false }],
+    "spaced-comment": ["error", "always", {
+      "line": { "markers": ["*package", "!", "/", ",", "="] },
+      "block": { "balanced": true, "markers": ["*package", "!", ",", ":", "::", "flow-include"], "exceptions": ["*"] }
+    }],
+    "symbol-description": "error",
+    "template-curly-spacing": ["error", "never"],
+    "template-tag-spacing": ["error", "never"],
+    "unicode-bom": ["error", "never"],
+    "use-isnan": "error",
+    "valid-typeof": ["error", { "requireStringLiterals": true }],
+    "wrap-iife": ["error", "any", { "functionPrototypeMethods": true }],
+    "yield-star-spacing": ["error", "both"],
+    "yoda": ["error", "never"],
+
+    "import/export": "error",
+    "import/first": "error",
+    "import/no-absolute-path": ["error", { "esmodule": true, "commonjs": true, "amd": false }],
+    "import/no-duplicates": "error",
+    "import/no-named-default": "error",
+    "import/no-webpack-loader-syntax": "error",
+
+    "node/no-deprecated-api": "error",
+    "node/process-exit-as-throw": "error",
+
+    "promise/param-names": "off",
+
+    "standard/no-callback-literal": "error"
+  }
+}