check-esm

Javascript functions to check if the node.js file is a ES Module or a CJS/ JS Module or Script

INSTALL

npm install check-esm --save

USAGE

ESM Module : import { _isESCode } from "check-esm";

CommonJS Script/ Module : const checkEsm = require("check-esm");

isESCode("./path/to/file.mjs")

[Simple Medium blog for usage] (https://medium.com/@ganeshsurfs/exploring-node-js-and-js-checking-is-a-package-is-a-commonjs-script-module-or-a-esm-module-2847c456d93f)

Package APIs

There are other script APIs you may wish to explore that includes the following:

_checkModuleImports : Check if a module can be imported. Usage: _checkModuleImports(absPath)

_requiresObject : Check require.cache list in code - used in your code's process global context. Usage: _requiresObject()

_requireRegex : Check to see if there are require() syntax in code. Usage: _requireRegex(absPath)

_importRegex : Check to see if there are import() syntax in code. Usage: _importRegex(absPath)

_importESRegex : Check to see if there are import x from "" syntax in code. Usage: _importESRegex(absPath)

_importRegexExtended : Check to see if there are import() syntax in code. Usage: _importRegexExtended(absPath)

_isESMFileExtension : Check to see if the file has .mjs/ .cjs/ .js extension. Usage: _isESMFileExtension(absPath)

_isESMCodeBase : Check to see if the code is ESM Module. Usage: _isESMCodeBase(absPath)

_isCJSCodeBase : Check to see if the code is CommonJS Script or Module. Usage: _isCJSCodeBase(absPath)

_isModuleInPackageJson : Checks type key's value in package.json. Usage: _getPackageJsonRoot(startdirectory, options)

_isESCode : Multiple checks to check if the code is ESM Module (other than package.json type key's value check in package.json). Usage: _isModuleInPackageJson(absPath, packagejsonPath, returns)