https://github.com/morlay/babel-plugin-pure-calls-annotation

https://github.com/morlay/babel-plugin-pure-calls-annotation

babel babel-plugin tree-shaking

Last synced: 10 months ago
JSON representation

• Host: GitHub
• URL: https://github.com/morlay/babel-plugin-pure-calls-annotation
• Owner: morlay
• License: wtfpl
• Created: 2017-08-03T13:32:15.000Z (almost 9 years ago)
• Default Branch: master
• Last Pushed: 2023-03-06T08:02:28.000Z (over 3 years ago)
• Last Synced: 2025-08-09T02:02:05.870Z (10 months ago)
• Topics: babel, babel-plugin, tree-shaking
• Language: TypeScript
• Homepage:
• Size: 259 KB
• Stars: 20
• Watchers: 2
• Forks: 2
• Open Issues: 8
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
## babel-plugin-pure-calls-annotation

[![test](https://img.shields.io/github/workflow/status/morlay/babel-plugin-pure-calls-annotation/test?style=flat-square)](https://github.com/morlay/babel-plugin-pure-calls-annotation/actions/workflows/test.yml)

[![codecov](https://img.shields.io/codecov/c/github/morlay/babel-plugin-pure-calls-annotation?style=flat-square)](https://codecov.io/gh/morlay/babel-plugin-pure-calls-annotation)

[![npm](https://img.shields.io/npm/v/babel-plugin-pure-calls-annotation?style=flat-square)](https://npmjs.org/package/babel-plugin-pure-calls-annotation)

[![dep](https://img.shields.io/librariesio/release/npm/babel-plugin-pure-calls-annotation?style=flat-square)](https://libraries.io/github/morlay/babel-plugin-pure-calls-annotation)

Automated annotate **`/*#__PURE__*/`** to call expression which in **variable declarator**,

**assignment expression**, **arguments of call expression** and other expressions as values

### Purpose

help to annotate **`/*#__PURE__*/`** to drop dead code in [Webpack](https://github.com/webpack/webpack)

for uglyfiy and tree shaking

Will transform

```typescript

export const call = (s) => {

    return "call" + s

}

export const stringA = call("a")

export const stringB = (() => call("b"))()

```

to

```typescript

export const call = (s) => {

    return "call" + s

}

export const stringA = /*#__PURE__*/call("a")

export const stringB = /*#__PURE__*/(() => call("b"))()

```

Notice:

code like below will not be pure call

```typescript

const a = setInterval(() => {

    console.log(a)

}, 1000)

```