feat: first commit(by dts)

Author: BjoernRave

.gitattributes

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+* text eol=lf

.github/workflows/main.yml

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+name: CI
+on: [push]
+jobs:
+  build:
+    name: Build, lint, and test on Node ${{ matrix.node }} and ${{ matrix.os }}
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        node: ['14.x', '16.x']
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v3
+
+      - name: Use Node ${{ matrix.node }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node }}
+
+      - name: Install deps and build (with cache)
+        uses: bahmutov/npm-install@v1
+
+      - name: Lint
+        run: yarn lint
+
+      - name: Test
+        run: yarn test --ci --coverage --maxWorkers=2
+
+      - name: Build
+        run: yarn build

.github/workflows/size.yml

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+name: size
+on: [pull_request]
+jobs:
+  size:
+    runs-on: ubuntu-latest
+    env:
+      CI_JOB_NUMBER: 1
+    steps:
+      - uses: actions/checkout@v3
+      - uses: andresz1/size-limit-action@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}

.gitignore

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+*.log
+.DS_Store
+node_modules
+dist

LICENSE

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+MIT License
+
+Copyright (c) 2023 BjoernRave
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# DTS User Guide
+
+Congrats! You just saved yourself hours of work by bootstrapping this project with DTS. Let’s get you oriented with what’s here and how to use it.
+
+> This DTS setup is meant for developing libraries (not apps!) that can be published to NPM. If you’re looking to build a Node app, you could use `ts-node-dev`, plain `ts-node`, or simple `tsc`.
+
+> If you’re new to TypeScript, checkout [this handy cheatsheet](https://devhints.io/typescript)
+
+## Commands
+
+DTS scaffolds your new library inside `/src`.
+
+To run DTS, use:
+
+```bash
+npm start # or yarn start
+```
+
+This builds to `/dist` and runs the project in watch mode so any edits you save inside `src` causes a rebuild to `/dist`.
+
+To do a one-off build, use `npm run build` or `yarn build`.
+
+To run tests, use `npm test` or `yarn test`.
+
+## Configuration
+
+Code quality is set up for you with `prettier`, `husky`, and `lint-staged`. Adjust the respective fields in `package.json` accordingly.
+
+### Jest
+
+Jest tests are set up to run with `npm test` or `yarn test`.
+
+### Bundle Analysis
+
+[`size-limit`](https://github.com/ai/size-limit) is set up to calculate the real cost of your library with `npm run size` and visualize the bundle with `npm run analyze`.
+
+#### Setup Files
+
+This is the folder structure we set up for you:
+
+```txt
+/src
+  index.ts        # EDIT THIS
+/test
+  index.test.ts   # EDIT THIS
+.gitignore
+package.json
+README.md         # EDIT THIS
+tsconfig.json
+```
+
+### Rollup
+
+DTS uses [Rollup](https://rollupjs.org) as a bundler and generates multiple rollup configs for various module formats and build settings. See [Optimizations](#optimizations) for details.
+
+### TypeScript
+
+`tsconfig.json` is set up to interpret `dom` and `esnext` types, as well as `react` for `jsx`. Adjust according to your needs.
+
+## Continuous Integration
+
+### GitHub Actions
+
+Two actions are added by default:
+
+- `main` which installs deps w/ cache, lints, tests, and builds on all pushes against a Node and OS matrix
+- `size` which comments cost comparison of your library on every pull request using [`size-limit`](https://github.com/ai/size-limit)
+
+## Optimizations
+
+Please see the main `dts` [optimizations docs](https://github.com/weiran-zsd/dts-cli#optimizations). In particular, know that you can take advantage of development-only optimizations:
+
+```js
+// ./types/index.d.ts
+declare var __DEV__: boolean;
+
+// inside your code...
+if (__DEV__) {
+  console.log('foo');
+}
+```
+
+You can also choose to install and use [invariant](https://github.com/weiran-zsd/dts-cli#invariant) and [warning](https://github.com/weiran-zsd/dts-cli#warning) functions.
+
+## Module Formats
+
+CJS, ESModules, and UMD module formats are supported.
+
+The appropriate paths are configured in `package.json` and `dist/index.js` accordingly. Please report if any issues are found.
+
+## Named Exports
+
+Per Palmer Group guidelines, [always use named exports.](https://github.com/palmerhq/typescript#exports) Code split inside your React app instead of your React library.
+
+## Including Styles
+
+There are many ways to ship styles, including with CSS-in-JS. DTS has no opinion on this, configure how you like.
+
+For vanilla CSS, you can include it at the root directory and add it to the `files` section in your `package.json`, so that it can be imported separately by your users and run through their bundler's loader.
+
+## Publishing to NPM
+
+We recommend using [np](https://github.com/sindresorhus/np).

package.json

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+{
+  "name": "mylib",
+  "version": "0.1.0",
+  "license": "MIT",
+  "author": "BjoernRave",
+  "main": "dist/index.js",
+  "module": "dist/mylib.esm.js",
+  "typings": "dist/index.d.ts",
+  "files": [
+    "dist",
+    "src"
+  ],
+  "scripts": {
+    "analyze": "size-limit --why",
+    "build": "dts build",
+    "lint": "dts lint",
+    "prepare": "dts build",
+    "size": "size-limit",
+    "start": "dts watch",
+    "test": "dts test"
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "dts lint"
+    }
+  },
+  "prettier": {
+    "printWidth": 80,
+    "semi": true,
+    "singleQuote": true,
+    "trailingComma": "es5"
+  },
+  "jest": {
+    "testEnvironment": "node"
+  },
+  "peerDependencies": {},
+  "engines": {
+    "node": ">=12"
+  },
+  "size-limit": [
+    {
+      "path": "dist/mylib.cjs.production.min.js",
+      "limit": "10 KB"
+    },
+    {
+      "path": "dist/mylib.esm.js",
+      "limit": "10 KB"
+    }
+  ]
+}

src/index.ts

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+export const sum = (a: number, b: number) => {
+  if ('development' === process.env.NODE_ENV) {
+    console.log('dev only output');
+  }
+  return a + b;
+};

test/index.test.ts

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+import { sum } from '../src/index';
+
+describe('sum', () => {
+  it('adds two numbers together', () => {
+    expect(sum(1, 1)).toEqual(2);
+  });
+});

tsconfig.json

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+{
+  "extends": "@tsconfig/recommended/tsconfig.json",
+  "include": ["src", "types"],
+  "compilerOptions": {
+    "module": "esnext",
+  }
+}