Initial import with skill sheet working
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node_modules/synckit/README.md
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# synckit
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[](https://github.com/un-ts/synckit/actions/workflows/ci.yml)
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[](https://codecov.io/gh/un-ts/synckit)
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[](https://github.com/plantain-00/type-coverage)
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[](https://www.npmjs.com/package/synckit)
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[](https://github.com/un-ts/synckit/releases)
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[](https://conventionalcommits.org)
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[](https://renovatebot.com)
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[](https://standardjs.com)
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[](https://github.com/prettier/prettier)
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Perform async work synchronously in Node.js using `worker_threads` with first-class TypeScript and Yarn P'n'P support.
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## TOC <!-- omit in toc -->
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- [Usage](#usage)
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- [Install](#install)
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- [API](#api)
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- [Types](#types)
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- [Options](#options)
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- [Envs](#envs)
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- [TypeScript](#typescript)
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- [`ts-node`](#ts-node)
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- [`esbuild-register`](#esbuild-register)
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- [`esbuild-runner`](#esbuild-runner)
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- [`swc`](#swc)
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- [`tsx`](#tsx)
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- [Benchmark](#benchmark)
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- [Sponsors](#sponsors)
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- [Backers](#backers)
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- [Changelog](#changelog)
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- [License](#license)
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## Usage
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### Install
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```sh
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# yarn
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yarn add synckit
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# npm
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npm i synckit
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```
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### API
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```js
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// runner.js
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import { createSyncFn } from 'synckit'
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// the worker path must be absolute
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const syncFn = createSyncFn(require.resolve('./worker'), {
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tsRunner: 'tsx', // optional, can be `'ts-node' | 'esbuild-register' | 'esbuild-runner' | 'tsx'`
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})
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// do whatever you want, you will get the result synchronously!
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const result = syncFn(...args)
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```
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```js
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// worker.js
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import { runAsWorker } from 'synckit'
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runAsWorker(async (...args) => {
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// do expensive work
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return result
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})
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```
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You must make sure, the `result` is serializable by [`Structured Clone Algorithm`](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Structured_clone_algorithm)
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### Types
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````ts
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export interface GlobalShim {
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moduleName: string
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/**
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* `undefined` means side effect only
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*/
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globalName?: string
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/**
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* 1. `undefined` or empty string means `default`, for example:
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* ```js
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* import globalName from 'module-name'
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* ```
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*
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* 2. `null` means namespaced, for example:
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* ```js
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* import * as globalName from 'module-name'
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* ```
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*
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*/
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named?: string | null
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/**
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* If not `false`, the shim will only be applied when the original `globalName` unavailable,
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* for example you may only want polyfill `globalThis.fetch` when it's unavailable natively:
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* ```js
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* import fetch from 'node-fetch'
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*
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* if (!globalThis.fetch) {
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* globalThis.fetch = fetch
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* }
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* ```
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*/
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conditional?: boolean
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}
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````
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### Options
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1. `execArgv` same as env `SYNCKIT_EXEC_ARGV`
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2. `globalShims`: Similar like env `SYNCKIT_GLOBAL_SHIMS` but much more flexible which can be a `GlobalShim` `Array`, see `GlobalShim`'s [definition](#types) for more details
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3. `timeout` same as env `SYNCKIT_TIMEOUT`
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4. `transferList`: Please refer Node.js [`worker_threads`](https://nodejs.org/api/worker_threads.html#:~:text=Default%3A%20true.-,transferList,-%3CObject%5B%5D%3E%20If) documentation
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5. `tsRunner` same as env `SYNCKIT_TS_RUNNER`
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### Envs
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1. `SYNCKIT_EXEC_ARGV`: List of node CLI options passed to the worker, split with comma `,`. (default as `[]`), see also [`node` docs](https://nodejs.org/api/worker_threads.html)
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2. `SYNCKIT_GLOBAL_SHIMS`: Whether to enable the default `DEFAULT_GLOBAL_SHIMS_PRESET` as `globalShims`
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3. `SYNCKIT_TIMEOUT`: `timeout` for performing the async job (no default)
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4. `SYNCKIT_TS_RUNNER`: Which TypeScript runner to be used, it could be very useful for development, could be `'ts-node' | 'esbuild-register' | 'esbuild-runner' | 'swc' | 'tsx'`, `'ts-node'` is used by default, make sure you have installed them already
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### TypeScript
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#### `ts-node`
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If you want to use `ts-node` for worker file (a `.ts` file), it is supported out of box!
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If you want to use a custom tsconfig as project instead of default `tsconfig.json`, use `TS_NODE_PROJECT` env. Please view [ts-node](https://github.com/TypeStrong/ts-node#tsconfig) for more details.
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If you want to integrate with [tsconfig-paths](https://www.npmjs.com/package/tsconfig-paths), please view [ts-node](https://github.com/TypeStrong/ts-node#paths-and-baseurl) for more details.
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#### `esbuild-register`
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Please view [`esbuild-register`][] for its document
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#### `esbuild-runner`
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Please view [`esbuild-runner`][] for its document
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#### `swc`
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Please view [`@swc-node/register`][] for its document
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#### `tsx`
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Please view [`tsx`][] for its document
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## Benchmark
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It is about 50x faster than [`sync-threads`](https://github.com/lambci/sync-threads) but 10x slower than native for reading the file content itself 1000 times during runtime, and 40x faster than `sync-threads` but 10x slower than native for total time on my personal MacBook Pro with 64G M1 Max.
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And it's almost 5x faster than [`deasync`](https://github.com/abbr/deasync) but requires no native bindings or `node-gyp`.
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See [benchmark.cjs](./benchmarks/benchmark.cjs.txt) and [benchmark.esm](./benchmarks/benchmark.esm.txt) for more details.
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You can try it with running `yarn benchmark` by yourself. [Here](./benchmarks/benchmark.js) is the benchmark source code.
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## Sponsors
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| 1stG | RxTS | UnTS |
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| ---------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------- |
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| [](https://opencollective.com/1stG) | [](https://opencollective.com/rxts) | [](https://opencollective.com/unts) |
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## Backers
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[](https://github.com/sponsors/JounQin)
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| 1stG | RxTS | UnTS |
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| -------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------- |
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| [](https://opencollective.com/1stG) | [](https://opencollective.com/rxts) | [](https://opencollective.com/unts) |
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## Changelog
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Detailed changes for each release are documented in [CHANGELOG.md](./CHANGELOG.md).
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## License
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[MIT][] © [JounQin][]@[1stG.me][]
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[`esbuild-register`]: https://github.com/egoist/esbuild-register
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[`esbuild-runner`]: https://github.com/folke/esbuild-runner
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[`@swc-node/register`]: https://github.com/swc-project/swc-node/tree/master/packages/register
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[`tsx`]: https://github.com/esbuild-kit/tsx
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[1stg.me]: https://www.1stg.me
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[jounqin]: https://GitHub.com/JounQin
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[mit]: http://opensource.org/licenses/MIT
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