# jsx-ast-utils

> AST utility module for statically analyzing JSX

Latest version **3.3.5** (published 2023-07-29) · MIT license · 0 weekly downloads

> **Better alternative:** See documentation for alternatives (https://github.com/AikidoSec/module-replacements/blob/main/docs/jsx-ast-utils)

## Install

```sh
npm install jsx-ast-utils
pnpm add jsx-ast-utils
yarn add jsx-ast-utils
bun add jsx-ast-utils
```

## Health

**Score 33/100 (F)** — status: abandoned.

Positive: has types package; no vulnerabilities; high quality score.

Warnings: low downloads; no esm support.

Negative: abandoned.

## Facts

| | |
|---|---|
| Version | 3.3.5 |
| Published | 2023-07-29 |
| First published | 2016-06-09 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | separate (@types/jsx-ast-utils) |
| Module format | CommonJS |
| Node | >=4.0 |
| Dependencies | 4 |
| Unpacked size | 230.1 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 164 |
| Author | Ethan Cohen |
| Maintainers | jessebeach, ljharb, evcohen |
| Keywords | jsx, ast, lint, eslint |

## Links

- npm: https://www.npmjs.com/package/jsx-ast-utils
- Repository: https://github.com/jsx-eslint/jsx-ast-utils
- Homepage: https://github.com/jsx-eslint/jsx-ast-utils#readme
- Issues: https://github.com/jsx-eslint/jsx-ast-utils/issues
- npm.io page: https://npm.io/package/jsx-ast-utils

## Dependencies (4)

- [object.assign](https://npm.io/package/object.assign.md) ^4.1.4
- [object.values](https://npm.io/package/object.values.md) ^1.1.6
- [array-includes](https://npm.io/package/array-includes.md) ^3.1.6
- [array.prototype.flat](https://npm.io/package/array.prototype.flat.md) ^1.3.1

## Alternatives

- [eslint-plugin-sonarjs](https://npm.io/package/eslint-plugin-sonarjs.md) — 2.9M weekly downloads
- [eslint-config-expo](https://npm.io/package/eslint-config-expo.md) — 1.5M weekly downloads
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- [@inrupt/eslint-config-base](https://npm.io/package/@inrupt/eslint-config-base.md) — 4.5K weekly downloads

## Recent versions

- 3.3.5 (latest) — 2023-07-29
- 3.3.4 — 2023-06-28
- 3.3.3 — 2022-08-08
- 3.3.2 — 2022-07-06
- 3.3.1 — 2022-06-22
- 3.3.0 — 2022-04-30
- 3.2.2 — 2022-03-31
- 3.2.1 — 2021-09-17
- 3.2.0 — 2020-12-16
- 3.1.0 — 2020-10-14
- 3.0.0 — 2020-10-07
- 2.4.1 — 2020-06-12
- 2.4.0 — 2020-06-11
- 2.3.0 — 2020-05-25
- 2.2.3 — 2019-10-24
- … 20 more at https://npm.io/package/jsx-ast-utils/versions

## README

# jsx-ast-utils <sup>[![Version Badge][npm-version-svg]][package-url]</sup>

[![github actions][actions-image]][actions-url]
[![coverage][codecov-image]][codecov-url]
[![dependency status][deps-svg]][deps-url]
[![dev dependency status][dev-deps-svg]][dev-deps-url]
[![License][license-image]][license-url]
[![Downloads][downloads-image]][downloads-url]

[![npm badge][npm-badge-png]][package-url]

AST utility module for statically analyzing JSX.

## Installation
```sh
$ npm i jsx-ast-utils --save
```

## Usage
This is a utility module to evaluate AST objects for JSX syntax. This can be super useful when writing linting rules for JSX code. It was originally in the code for [eslint-plugin-jsx-a11y](https://github.com/jsx-eslint/eslint-plugin-jsx-a11y), however I thought it could be useful to be extracted and maintained separately so **you** could write new interesting rules to statically analyze JSX.

### ESLint example
```js
import { hasProp } from 'jsx-ast-utils';
// OR: var hasProp = require('jsx-ast-utils').hasProp;
// OR: const hasProp = require('jsx-ast-utils/hasProp');
// OR: import hasProp from 'jsx-ast-utils/hasProp';

module.exports = context => ({
  JSXOpeningElement: node => {
    const onChange = hasProp(node.attributes, 'onChange');

    if (onChange) {
      context.report({
        node,
        message: `No onChange!`
      });
    }
  }
});
```

## API
### AST Resources
1. [JSX spec](https://github.com/facebook/jsx/blob/master/AST.md)
2. [JS spec](https://github.com/estree/estree/blob/master/spec.md)

### hasProp
```js
hasProp(props, prop, options);
```
Returns boolean indicating whether an prop exists as an attribute on a JSX element node.

#### Props
Object - The attributes on the visited node. (Usually `node.attributes`).
#### Prop
String - A string representation of the prop you want to check for existence.
#### Options
Object - An object representing options for existence checking
  1. `ignoreCase` - automatically set to `true`.
  2. `spreadStrict` - automatically set to `true`. This means if spread operator exists in
     props, it will assume the prop you are looking for is not in the spread.
     Example: `<div {...props} />` looking for specific prop here will return false if `spreadStrict` is `true`.

<hr />

### hasAnyProp

```js
hasAnyProp(props, prop, options);
```
Returns a boolean indicating if **any** of props in `prop` argument exist on the node.

#### Props
Object - The attributes on the visited node. (Usually `node.attributes`).
#### Prop
Array<String> - An array of strings representing the props you want to check for existence.
#### Options
Object - An object representing options for existence checking
  1. `ignoreCase` - automatically set to `true`.
  2. `spreadStrict` - automatically set to `true`. This means if spread operator exists in
     props, it will assume the prop you are looking for is not in the spread.
     Example: `<div {...props} />` looking for specific prop here will return false if `spreadStrict` is `true`.

<hr />

### hasEveryProp

```js
hasEveryProp(props, prop, options);
```
Returns a boolean indicating if **all** of props in `prop` argument exist on the node.

#### Props
Object - The attributes on the visited node. (Usually `node.attributes`).
#### Prop
Array<String> - An array of strings representing the props you want to check for existence.
#### Options
Object - An object representing options for existence checking
 1. `ignoreCase` - automatically set to `true`.
 2. `spreadStrict` - automatically set to `true`. This means if spread operator exists in
    props, it will assume the prop you are looking for is not in the spread.
    Example: `<div {...props} />` looking for specific prop here will return false if `spreadStrict` is `true`.

<hr />

### getProp

```js
getProp(props, prop, options);
```
Returns the JSXAttribute itself or undefined, indicating the prop is not present on the JSXOpeningElement.

#### Props
Object - The attributes on the visited node. (Usually `node.attributes`).
#### Prop
String - A string representation of the prop you want to check for existence.
#### Options
Object - An object representing options for existence checking
  1. `ignoreCase` - automatically set to `true`.

<hr />

### elementType
```js
elementType(node)
```
Returns the tagName associated with a JSXElement.

#### Node
Object - The visited JSXElement node object.

<hr />

### getPropValue

```js
getPropValue(prop);
```
Returns the value of a given attribute. Different types of attributes have their associated values in different properties on the object.

This function should return the most *closely* associated value with the intention of the JSX.

#### Prop
Object - The JSXAttribute collected by AST parser.

<hr />

### getLiteralPropValue

```js
getLiteralPropValue(prop);
```
Returns the value of a given attribute. Different types of attributes have their associated values in different properties on the object.

This function should return a value only if we can extract a literal value from its attribute (i.e. values that have generic types in JavaScript - strings, numbers, booleans, etc.)

#### Prop
Object - The JSXAttribute collected by AST parser.

<hr />

### propName

```js
propName(prop);
```
Returns the name associated with a JSXAttribute. For example, given `<div foo="bar" />` and the JSXAttribute for `foo`, this will return the string `"foo"`.

#### Prop
Object - The JSXAttribute collected by AST parser.

<hr />

### eventHandlers

```js
console.log(eventHandlers);
/*
[
  'onCopy',
  'onCut',
  'onPaste',
  'onCompositionEnd',
  'onCompositionStart',
  'onCompositionUpdate',
  'onKeyDown',
  'onKeyPress',
  'onKeyUp',
  'onFocus',
  'onBlur',
  'onChange',
  'onInput',
  'onSubmit',
  'onClick',
  'onContextMenu',
  'onDblClick',
  'onDoubleClick',
  'onDrag',
  'onDragEnd',
  'onDragEnter',
  'onDragExit',
  'onDragLeave',
  'onDragOver',
  'onDragStart',
  'onDrop',
  'onMouseDown',
  'onMouseEnter',
  'onMouseLeave',
  'onMouseMove',
  'onMouseOut',
  'onMouseOver',
  'onMouseUp',
  'onSelect',
  'onTouchCancel',
  'onTouchEnd',
  'onTouchMove',
  'onTouchStart',
  'onScroll',
  'onWheel',
  'onAbort',
  'onCanPlay',
  'onCanPlayThrough',
  'onDurationChange',
  'onEmptied',
  'onEncrypted',
  'onEnded',
  'onError',
  'onLoadedData',
  'onLoadedMetadata',
  'onLoadStart',
  'onPause',
  'onPlay',
  'onPlaying',
  'onProgress',
  'onRateChange',
  'onSeeked',
  'onSeeking',
  'onStalled',
  'onSuspend',
  'onTimeUpdate',
  'onVolumeChange',
  'onWaiting',
  'onLoad',
  'onError',
  'onAnimationStart',
  'onAnimationEnd',
  'onAnimationIteration',
  'onTransitionEnd',
]
*/
```

Contains a flat list of common event handler props used in JSX to attach behaviors
to DOM events.

#### eventHandlersByType

The same list as `eventHandlers`, grouped into types.

```js
console.log(eventHandlersByType);
/*
{
  clipboard: [ 'onCopy', 'onCut', 'onPaste' ],
  composition: [ 'onCompositionEnd', 'onCompositionStart', 'onCompositionUpdate' ],
  keyboard: [ 'onKeyDown', 'onKeyPress', 'onKeyUp' ],
  focus: [ 'onFocus', 'onBlur' ],
  form: [ 'onChange', 'onInput', 'onSubmit' ],
  mouse: [ 'onClick', 'onContextMenu', 'onDblClick', 'onDoubleClick', 'onDrag', 'onDragEnd', 'onDragEnter', 'onDragExit', 'onDragLeave', 'onDragOver', 'onDragStart', 'onDrop', 'onMouseDown', 'onMouseEnter', 'onMouseLeave', 'onMouseMove', 'onMouseOut', 'onMouseOver', 'onMouseUp' ],
  selection: [ 'onSelect' ],
  touch: [ 'onTouchCancel', 'onTouchEnd', 'onTouchMove', 'onTouchStart' ],
  ui: [ 'onScroll' ],
  wheel: [ 'onWheel' ],
  media: [ 'onAbort', 'onCanPlay', 'onCanPlayThrough', 'onDurationChange', 'onEmptied', 'onEncrypted', 'onEnded', 'onError', 'onLoadedData', 'onLoadedMetadata', 'onLoadStart', 'onPause', 'onPlay', 'onPlaying', 'onProgress', 'onRateChange', 'onSeeked', 'onSeeking', 'onStalled', 'onSuspend', 'onTimeUpdate', 'onVolumeChange', 'onWaiting' ],
  image: [ 'onLoad', 'onError' ],
  animation: [ 'onAnimationStart', 'onAnimationEnd', 'onAnimationIteration' ],
  transition: [ 'onTransitionEnd' ],
}
*/
```


[1]: https://npmjs.org/package/jsx-ast-utils
[2]: https://versionbadg.es/jsx-eslint/jsx-ast-utils.svg
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[7]: https://david-dm.org/jsx-eslint/jsx-ast-utils/dev-status.svg
[8]: https://david-dm.org/jsx-eslint/jsx-ast-utils#info=devDependencies
[11]: https://nodei.co/npm/jsx-ast-utils.png?downloads=true&stars=true
[license-image]: https://img.shields.io/npm/l/jsx-ast-utils.svg
[license-url]: LICENSE
[downloads-image]: https://img.shields.io/npm/dm/jsx-ast-utils.svg
[downloads-url]: https://npm-stat.com/charts.html?package=jsx-ast-utils
[codecov-image]: https://codecov.io/gh/jsx-eslint/jsx-ast-utils/branch/main/graphs/badge.svg
[codecov-url]: https://app.codecov.io/gh/jsx-eslint/jsx-ast-utils/
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[actions-url]: https://github.com/jsx-eslint/jsx-ast-utils/actions

---
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