The `get-package-type` npm package is designed to determine the type of a Node.js package. It can identify if a package is a CommonJS or an ECMAScript module by analyzing the package's configuration and structure. This is particularly useful in environments where understanding the module type is necessary for compatibility or transformation purposes.

What are get-package-type's main functionalities?

Determine package type

This feature allows you to determine whether a given package is a CommonJS or ECMAScript module. The function `getPackageType` takes the path to the package as an argument and returns a promise that resolves with the type of the package.

const getPackageType = require('get-package-type');

async function checkPackageType() {
  const type = await getPackageType('/path/to/package');
  console.log(`Package type: ${type}`); // 'commonjs' or 'module'
}

checkPackageType();

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get-package-type

Determine the package.json#type which applies to a location.

Usage

const getPackageType = require('get-package-type');

(async () => {
  console.log(await getPackageType('file.js'));
  console.log(getPackageType.sync('file.js'));
})();

This function does not validate the value found in package.json#type. Any truthy value found will be returned. Non-truthy values will be reported as commonjs.

The argument must be a filename.

// This never looks at `dir1/`, first attempts to load `./package.json`.
const type1 = await getPackageType('dir1/');

// This attempts to load `dir1/package.json`.
const type2 = await getPackageType('dir1/index.cjs');

The extension of the filename does not effect the result. The primary use case for this module is to determine if myapp.config.js should be loaded with require or import.

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Last updated on 19 May 2020

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