121 lines
5.7 KiB
Markdown
121 lines
5.7 KiB
Markdown
# eslint-visitor-keys
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[](https://www.npmjs.com/package/eslint-visitor-keys)
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[](http://www.npmtrends.com/eslint-visitor-keys)
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[](https://github.com/eslint/js/actions)
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Constants and utilities about visitor keys to traverse AST.
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## 💿 Installation
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Use [npm] to install.
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```bash
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$ npm install eslint-visitor-keys
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```
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### Requirements
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- [Node.js] `^18.18.0`, `^20.9.0`, or `>=21.1.0`
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## 📖 Usage
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To use in an ESM file:
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```js
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import * as evk from "eslint-visitor-keys"
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```
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To use in a CommonJS file:
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```js
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const evk = require("eslint-visitor-keys")
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```
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### evk.KEYS
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> type: `{ [type: string]: string[] | undefined }`
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Visitor keys. This keys are frozen.
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This is an object. Keys are the type of [ESTree] nodes. Their values are an array of property names which have child nodes.
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For example:
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```
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console.log(evk.KEYS.AssignmentExpression) // → ["left", "right"]
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```
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### evk.getKeys(node)
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> type: `(node: object) => string[]`
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Get the visitor keys of a given AST node.
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This is similar to `Object.keys(node)` of ES Standard, but some keys are excluded: `parent`, `leadingComments`, `trailingComments`, and names which start with `_`.
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This will be used to traverse unknown nodes.
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For example:
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```js
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const node = {
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type: "AssignmentExpression",
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left: { type: "Identifier", name: "foo" },
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right: { type: "Literal", value: 0 }
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}
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console.log(evk.getKeys(node)) // → ["type", "left", "right"]
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```
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### evk.unionWith(additionalKeys)
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> type: `(additionalKeys: object) => { [type: string]: string[] | undefined }`
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Make the union set with `evk.KEYS` and the given keys.
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- The order of keys is, `additionalKeys` is at first, then `evk.KEYS` is concatenated after that.
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- It removes duplicated keys as keeping the first one.
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For example:
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```js
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console.log(evk.unionWith({
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MethodDefinition: ["decorators"]
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})) // → { ..., MethodDefinition: ["decorators", "key", "value"], ... }
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```
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## 📰 Change log
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See [GitHub releases](https://github.com/eslint/js/releases).
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## 🍻 Contributing
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Welcome. See [ESLint contribution guidelines](https://eslint.org/docs/developer-guide/contributing/).
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### Development commands
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- `npm test` runs tests and measures code coverage.
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- `npm run lint` checks source codes with ESLint.
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- `npm run test:open-coverage` opens the code coverage report of the previous test with your default browser.
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[npm]: https://www.npmjs.com/
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[Node.js]: https://nodejs.org/
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[ESTree]: https://github.com/estree/estree
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<!-- NOTE: This section is autogenerated. Do not manually edit.-->
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<!--sponsorsstart-->
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## Sponsors
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The following companies, organizations, and individuals support ESLint's ongoing maintenance and development. [Become a Sponsor](https://eslint.org/donate)
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to get your logo on our READMEs and [website](https://eslint.org/sponsors).
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<h3>Platinum Sponsors</h3>
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<p><a href="https://automattic.com"><img src="https://images.opencollective.com/automattic/d0ef3e1/logo.png" alt="Automattic" height="128"></a> <a href="https://www.airbnb.com/"><img src="https://images.opencollective.com/airbnb/d327d66/logo.png" alt="Airbnb" height="128"></a></p><h3>Gold Sponsors</h3>
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<p><a href="https://trunk.io/"><img src="https://images.opencollective.com/trunkio/fb92d60/avatar.png" alt="trunk.io" height="96"></a></p><h3>Silver Sponsors</h3>
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<p><a href="https://www.jetbrains.com/"><img src="https://images.opencollective.com/jetbrains/fe76f99/logo.png" alt="JetBrains" height="64"></a> <a href="https://liftoff.io/"><img src="https://images.opencollective.com/liftoff/5c4fa84/logo.png" alt="Liftoff" height="64"></a> <a href="https://americanexpress.io"><img src="https://avatars.githubusercontent.com/u/3853301?v=4" alt="American Express" height="64"></a> <a href="https://www.workleap.com"><img src="https://avatars.githubusercontent.com/u/53535748?u=d1e55d7661d724bf2281c1bfd33cb8f99fe2465f&v=4" alt="Workleap" height="64"></a></p><h3>Bronze Sponsors</h3>
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<p><a href="https://www.wordhint.net/"><img src="https://images.opencollective.com/wordhint/be86813/avatar.png" alt="WordHint" height="32"></a> <a href="https://www.crosswordsolver.org/anagram-solver/"><img src="https://images.opencollective.com/anagram-solver/2666271/logo.png" alt="Anagram Solver" height="32"></a> <a href="https://icons8.com/"><img src="https://images.opencollective.com/icons8/7fa1641/logo.png" alt="Icons8" height="32"></a> <a href="https://discord.com"><img src="https://images.opencollective.com/discordapp/f9645d9/logo.png" alt="Discord" height="32"></a> <a href="https://www.gitbook.com"><img src="https://avatars.githubusercontent.com/u/7111340?v=4" alt="GitBook" height="32"></a> <a href="https://nx.dev"><img src="https://avatars.githubusercontent.com/u/23692104?v=4" alt="Nx" height="32"></a> <a href="https://herocoders.com"><img src="https://avatars.githubusercontent.com/u/37549774?v=4" alt="HeroCoders" height="32"></a></p>
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<h3>Technology Sponsors</h3>
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Technology sponsors allow us to use their products and services for free as part of a contribution to the open source ecosystem and our work.
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<p><a href="https://netlify.com"><img src="https://raw.githubusercontent.com/eslint/eslint.org/main/src/assets/images/techsponsors/netlify-icon.svg" alt="Netlify" height="32"></a> <a href="https://algolia.com"><img src="https://raw.githubusercontent.com/eslint/eslint.org/main/src/assets/images/techsponsors/algolia-icon.svg" alt="Algolia" height="32"></a> <a href="https://1password.com"><img src="https://raw.githubusercontent.com/eslint/eslint.org/main/src/assets/images/techsponsors/1password-icon.svg" alt="1Password" height="32"></a></p>
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<!--sponsorsend-->
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