https://github.com/GoogleChromeLabs/detect-es-version

https://github.com/GoogleChromeLabs/detect-es-version

Last synced: about 1 month ago
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• Host: GitHub
• URL: https://github.com/GoogleChromeLabs/detect-es-version
• Owner: GoogleChromeLabs
• License: apache-2.0
• Created: 2020-08-04T17:34:26.000Z (almost 4 years ago)
• Default Branch: master
• Last Pushed: 2023-10-16T19:16:52.000Z (8 months ago)
• Last Synced: 2024-04-22T00:52:40.298Z (2 months ago)
• Language: JavaScript
• Size: 3.03 MB
• Stars: 76
• Watchers: 9
• Forks: 5
• Open Issues: 25
• Metadata Files:
  • Readme: README.md
  • Contributing: CONTRIBUTING.md
  • License: LICENSE

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README

        
# `detect-es-version`



  



Given a package name, filepath, or string of code, returns the [ecma version](https://developer.mozilla.org/en-US/docs/Glossary/ECMAScript). You can try out the web app version [here](https://detect-es-version.glitch.me/)!

## Usage

```javascript

const { getEcmaVersion } = require('detect-es-version');

const ecmaVersion = getEcmaVersion('const foo = 123;');

console.log(ecmaVersion); // prints 2015

```

## API

### getPackageEcmaVersion(packageString, resolverOptions)

- `packageString` (`String`): A string representing a package. e.g. “react”, “[email protected]” to be pulled from npm.

- `resolverOptions` (`Object`): An options object to pass to [enhanced-resolve](https://github.com/webpack/enhanced-resolve#resolver-options). This can be used to control which entry points are analyzed.

- Returns (`Number`): The ecma version of the package. e.g. 2017.

### getLocalPackageEcmaVersion(packagePath, resolverOptions)

- `packagePath` (`String`): An absolute path to a package’s directory. The directory must contain an index file or package.json.

- `resolverOptions` (`Object`): An options object to pass to [enhanced-resolve](https://github.com/webpack/enhanced-resolve#resolver-options). This can be used to control which entry points are analyzed.

- Returns (`Number`): The ecma version of the package. e.g. 2017.

### getEntryPointEcmaVersion(entryPoint, resolverOptions)

- `entryPoint` (`String`): An absolute path to an entry point.

- `resolverOptions` (`Object`): An options object to pass to [enhanced-resolve](https://github.com/webpack/enhanced-resolve#resolver-options). This can be used to control which entry points are analyzed.

- Returns (`Number`): The ecma version of the package. e.g. 2017.

### getEcmaVersion(content)

- `code` (`String`|`Object`): The source code or AST to inspect

- Returns (`Number`): The ecma version of the source code or AST. e.g. 2017.

### isEcmaVersionModern(ecmaVersion)

- `ecmaVersion` (`Number`): A number representing an ECMA version. e.g.  5, 2015, or 2016

- Returns (`Boolean`): True if the ECMA version is considered modern; False otherwise