Use if (import.meta.url === `file://${process.argv[1]}`) { // module was not imported but called directly } See the MDN docs on import.meta for details. Update Sep 27, 2021 Perhaps more robust, but involving an extra import (via Rich Harris) import { pathToFileURL } from ‘url’ if (import.meta.url === pathToFileURL(process.argv[1]).href) { // module was not imported but … Read more
From Node.js version 17.5.0 onward, importing a JSON file is possible using Import Assertions: import packageFile from “../../package.json” assert { type: “json” }; const { name, version } = packageFile; assert { type: “json” } is mandatory Destructuring such as { name, version } is not possible in the import declaration directly The contents of … Read more
If you don’t wish to use any bundling tools, you will need to provide a path to the lodash folder within node_modules, relative to the JavaScript file that you have the import statement in. If you do not wish to use a bundler, it would also be worthwhile importing from the specific file, the function … Read more
Would it depend on the version of javascript? No, it depends on the behavior of JavaScript runtime, that is, the thing that executes your script. In a browser with support for ES Modules (ESM), no extensions will be added to the URL that you import – if your file for example has .js extension, you … Read more
Here are the differences I have noted from various articles. If you want more details, read a complete article on the internet: Modules are singleton. They will be loaded and executed only once. Modules can use import and export. Modules are always executed in strict mode. All objects (class, const, function, let, or var) are … Read more
Firstly I would like to state the difference between the commonJS and commonJS2 CommonJS doesn’t support the use of module.exports = function() {} which is used by node.js and many other commonJS implementations. Webpack2 employs the concept of the bundling the library code and for the widespread use of it and to make it compatible … Read more
If you use proposal-export-default-from Babel plugin (which is a part of stage-1 preset), you’ll be able to re-export default using the following code: export default from “./App.js” For more information see the ECMAScript proposal. Another way (without this plugin) is: export { default as App } from “./App.js” The above is a very common practice … Read more
From Next.js 12, support for ES Modules is now enabled by default, as long as the ESM library has “type”: “module” in its package.json. Using next-transpile-modules to transpile ESM libraries is no longer required. Before Next.js 12 Since ky is exported as ESM you can transpile it with next-transpile-modules in next.config.js. // next.config.js const withTM … Read more
They’re just not implemented yet. Node 6.0.0 uses a version of V8 with most of ES6 features completed. Unfortunately modules isn’t one of those completed features. node –v8-options | grep harmony in progress harmony flags are not fully implemented and usually are not working: –es_staging (enable test-worthy harmony features (for internal use only)) –harmony (enable … Read more
You have to re-import or re-require your module. Check the doc or this issue for more information: https://github.com/facebook/jest/issues/3236 https://facebook.github.io/jest/docs/en/jest-object.html#jestresetmodules describe(‘MyModule’, () => { beforeEach(() => { jest.resetModules() }); describe(‘init’, () => { const myModule = require(‘./MyModule’); it(‘not throws exception when called’, () => { expect(() => myModule.init()).not.toThrow(); }); }) describe(‘do’, () => { const myModule … Read more