Integrate TypeScript port

.babelrc.js

@@ -1,22 +1,40 @@
 const { NODE_ENV, BABEL_ENV } = process.env
 const cjs = NODE_ENV === 'test' || BABEL_ENV === 'commonjs'
-const loose = true
 
 module.exports = {
-  presets: [['@babel/env', { loose, modules: false }]],
+  presets: [
+    [
+      '@babel/preset-env',
+      {
+        targets: {
+          esmodules: true,
+        },
+        // Use the equivalent of `babel-preset-modules`
+        bugfixes: true,
+        modules: false,
+        loose: true,
+      },
+    ],
+    '@babel/preset-typescript',
+  ],
   plugins: [
     ['@babel/proposal-decorators', { legacy: true }],
-    ['@babel/proposal-object-rest-spread', { loose }],
     '@babel/transform-react-jsx',
-    cjs && ['@babel/transform-modules-commonjs', { loose }],
+    ['@babel/plugin-proposal-class-properties', { loose: true }],
+    ['@babel/plugin-proposal-private-methods', { loose: true }],
+    ['@babel/plugin-proposal-private-property-in-object', { loose: true }],
+    cjs && ['@babel/transform-modules-commonjs'],
     [
       '@babel/transform-runtime',
       {
         useESModules: !cjs,
         version: require('./package.json').dependencies[
           '@babel/runtime'
-        ].replace(/^[^0-9]*/, '')
-      }
-    ]
-  ].filter(Boolean)
+        ].replace(/^[^0-9]*/, ''),
+      },
+    ],
+  ].filter(Boolean),
+  assumptions: {
+    enumerableModuleMeta: true,
+  },
 }

.codesandbox/ci.json

@@ -0,0 +1,6 @@
+{
+  "sandboxes": ["vanilla", "vanilla-ts"],
+  "node": "14",
+  "buildCommand": "build",
+  "packages": ["."]
+}

.eslintrc

@@ -1,14 +1,21 @@
 {
-  "parser": "babel-eslint",
+  "parser": "@typescript-eslint/parser",
   "extends": [
     "eslint:recommended",
     "plugin:import/recommended",
     "plugin:react/recommended",
     "plugin:prettier/recommended"
+    // "plugin:@typescript-eslint/recommended"
   ],
   "settings": {
     "react": {
       "version": "detect"
+    },
+    "import/ignore": ["react-native"],
+    "import/resolver": {
+      "node": {
+        "extensions": [".js", ".ts", ".tsx"]
+      }
     }
   },
   "parserOptions": {
@@ -29,10 +36,14 @@
     "react/jsx-uses-react": 1,
     "react/jsx-no-undef": 2,
     "react/jsx-wrap-multilines": 2,
-    "react/no-string-refs": 0
+    "react/no-string-refs": 0,
+    "no-unused-vars": "off",
+    "@typescript-eslint/no-unused-vars": ["error"],
+    "no-redeclare": "off",
+    "@typescript-eslint/no-redeclare": ["error"]
   },
-  "plugins": [
-    "import",
-    "react"
-  ]
+  "plugins": ["@typescript-eslint", "import", "react"],
+  "globals": {
+    "JSX": true
+  }
 }

.github/workflows/test.yml

@@ -2,39 +2,90 @@ name: Tests
 
 on:
   push:
-    branches: [ master ]
+    branches: [master, typescript-port]
   pull_request:
-    branches: [ master ]
+    branches: [master, typescript-port]
 
 jobs:
   build:
     name: Test Suite
     runs-on: ubuntu-latest
 
     steps:
+      - name: Set up Node
+        uses: actions/setup-node@v1
+        with:
+          node-version: 14.x
 
-    - name: Set up Node
-      uses: actions/setup-node@v1
-      with:
-        node-version: 14.x
+      - name: Checkout code
+        uses: actions/checkout@v2
 
-    - name: Checkout code
-      uses: actions/checkout@v2
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        with:
+          path: .yarn/cache
+          key: yarn-${{ hashFiles('yarn.lock') }}
+          restore-keys: yarn-
 
-    - name: Cache dependencies
-      uses: actions/cache@v2
-      with:
-        path: ~/.npm 
-        key: ${{ runner.OS }}-npm-${{ hashFiles('**/package-lock.json') }}
-        restore-keys: |
-          ${{ runner.OS }}-npm-
-          ${{ runner.OS }}-
+      - name: Install dependencies
+        run: yarn install
 
-    - name: Install dependencies
-      run: npm ci
+      - name: Run test suite
+        run: yarn test
 
-    - name: Run test suite
-      run: npm test
+      - name: Collect coverage
+        run: yarn coverage
 
-    - name: Collect coverage
-      run: npm run coverage
+  test-types:
+    name: Test Types with TypeScript ${{ matrix.ts }}
+
+    needs: [build]
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        node: ['14.x']
+        ts: ['3.9', '4.0', '4.1', '4.2', '4.3', 'next']
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v2
+
+      - name: Use node ${{ matrix.node }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node }}
+
+      - uses: actions/cache@v2
+        with:
+          path: .yarn/cache
+          key: yarn-${{ hashFiles('yarn.lock') }}
+          restore-keys: yarn-
+
+      - name: Install deps
+        run: yarn install
+
+      - name: Install TypeScript ${{ matrix.ts }}
+        run: yarn add typescript@${{ matrix.ts }}
+
+      # - uses: actions/download-artifact@v2
+      #   with:
+      #     name: package
+      #     path: packages/toolkit
+
+      # - name: Install build artifact
+      #   run: yarn add ./package.tgz
+
+      # - run: sed -i -e /@remap-prod-remove-line/d ./tsconfig.base.json ./jest.config.js ./src/tests/*.* ./src/query/tests/*.*
+
+      # - name: "@ts-ignore stuff that didn't exist pre-4.1 in the tests"
+      #   if: ${{ matrix.ts < 4.1 }}
+      #   run: sed -i -e 's/@pre41-ts-ignore/@ts-ignore/' -e  '/pre41-remove-start/,/pre41-remove-end/d' ./src/tests/*.* ./src/query/tests/*.ts*
+
+      # - name: 'disable strictOptionalProperties'
+      #   if: ${{ matrix.ts == 'next' }}
+      #   run: sed -i -e 's|//\(.*strictOptionalProperties.*\)$|\1|' tsconfig.base.json
+
+      - name: Test types
+        run: |
+          yarn tsc --version
+          yarn type-tests

.gitignore

@@ -3,6 +3,23 @@ dist
 lib
 coverage
 es
+temp/
+react-redux-*/
+
+.cache
+.yarnrc
+.yarn/*
+!.yarn/patches
+!.yarn/releases
+!.yarn/plugins
+!.yarn/sdks
+!.yarn/versions
+.pnp.*
+*.tgz
+
+.yalc
+yalc.lock
+yalc.sig
 
 lib/core/metadata.js
 lib/core/MetadataBlog.js

.yarn/plugins/@yarnpkg/plugin-compat.cjs

@@ -0,0 +1,9 @@
+module.exports = {
+  name: `@yarnpkg/plugin-compat`,
+  factory: (require) => {
+    // we are not using PNP and want to use `typescript@next` in CI without hassle
+    // dummy implementation to override the built-in version of this plugin
+    // can be dropped once we switch to yarn 3
+    return {}
+  },
+}

.yarnrc.yml

@@ -0,0 +1,9 @@
+nodeLinker: node-modules
+
+plugins:
+  - path: .yarn/plugins/@yarnpkg/plugin-workspace-tools.cjs
+    spec: '@yarnpkg/plugin-workspace-tools'
+  - path: .yarn/plugins/@yarnpkg/plugin-compat.cjs
+    spec: '@yarnpkg/plugin-compat'
+
+yarnPath: .yarn/releases/yarn-berry.cjs

CONTRIBUTING.md

@@ -1,9 +1,11 @@
 # Contributing
-We are open to, and grateful for, any contributions made by the community.  By contributing to React Redux, you agree to abide by the [code of conduct](https://github.com/reduxjs/react-redux/blob/master/CODE_OF_CONDUCT.md). 
+
+We are open to, and grateful for, any contributions made by the community. By contributing to React Redux, you agree to abide by the [code of conduct](https://github.com/reduxjs/react-redux/blob/master/CODE_OF_CONDUCT.md).
 
 Please review the [Redux Style Guide](https://redux.js.org/style-guide/style-guide) in the Redux docs to keep track of our best practices.
 
 ## Reporting Issues and Asking Questions
+
 Before opening an issue, please search the [issue tracker](https://github.com/reduxjs/react-redux/issues) to make sure your issue hasn't already been reported.
 
 Please ask any general and implementation specific questions on [Stack Overflow with a Redux tag](http://stackoverflow.com/questions/tagged/redux?sort=votes&pageSize=50) for support.
@@ -13,43 +15,56 @@ Please ask any general and implementation specific questions on [Stack Overflow
 Visit the [Issue tracker](https://github.com/reduxjs/react-redux/issues) to find a list of open issues that need attention.
 
 Fork, then clone the repo:
+
 ```
 git clone https://github.com/your-username/react-redux.git
 ```
 
+This repository uses Yarn v2 to manage packages. You'll need to have Yarn v1.22 installed globally on your system first, as Yarn v2 depends on that being available first. Install dependencies with:
+
+```
+yarn install
+```
+
 ### Building
 
 Running the `build` task will create both a CommonJS module-per-module build and a UMD build.
+
 ```
-npm run build
+yarn build
 ```
 
 To create just a CommonJS module-per-module build:
+
 ```
-npm run build:lib
+yarn build:lib
 ```
 
 To create just a UMD build:
+
 ```
-npm run build:umd
-npm run build:umd:min
+yarn build:umd
+yarn build:umd:min
 ```
 
 ### Testing and Linting
 
 To run the tests:
+
 ```
-npm run test
+yarn test
 ```
 
 To continuously watch and run tests, run the following:
+
 ```
-npm test -- --watch
+yarn test --watch
 ```
 
 To perform linting with `eslint`, run the following:
+
 ```
-npm run lint
+yarn lint
 ```
 
 ### New Features
@@ -58,11 +73,11 @@ Please open an issue with a proposal for a new feature or refactoring before sta
 
 ## Submitting Changes
 
-* Open a new issue in the [Issue tracker](https://github.com/reduxjs/react-redux/issues).
-* Fork the repo.
-* Create a new feature branch based off the `master` branch.
-* Make sure all tests pass and there are no linting errors.
-* Submit a pull request, referencing any issues it addresses.
+- Open a new issue in the [Issue tracker](https://github.com/reduxjs/react-redux/issues).
+- Fork the repo.
+- Create a new feature branch based off the `master` branch.
+- Make sure all tests pass and there are no linting errors.
+- Submit a pull request, referencing any issues it addresses.
 
 Please try to keep your pull request focused in scope and avoid including unrelated commits.