detect-es-version

Given a package name, filepath, or string of code, returns the ecma version. You can try out the web app version here!

Usage

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”, “react@16.13.1” to be pulled from npm.
• resolverOptions (Object): An options object to pass to enhanced-resolve. 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. 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. 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