In ES6, imports are live read-only views on exported-values. As a result, when you do import a from “somemodule”;, you cannot assign to a no matter how you declare a in the module. However, since imported variables are live views, they do change according to the “raw” exported variable in exports. Consider the following code … Read more
ES6 modules are always in strict mode. To quote the relevant part of the spec: 10.2.1 Strict Mode Code An ECMAScript Script syntactic unit may be processed using either unrestricted or strict mode syntax and semantics. Code is interpreted as strict mode code in the following situations: Global code is strict mode code if it … Read more
As of Node.js 10.12 there’s an alternative that doesn’t require creating multiple files and handles special characters in filenames across platforms: import { dirname } from ‘path’; import { fileURLToPath } from ‘url’; const __dirname = dirname(fileURLToPath(import.meta.url));
Node.js 13.2.0 & Above Node.js 13.2.0 now supports ES Modules without a flag 🎉. However, the implementation is still marked as experimental so use in production with caution. To enable ECMAScript module (ESM) support in 13.2.0, add the following to your package.json: { “type”: “module” } All .js, .mjs (or files without an extension) will … Read more
It’s a named export vs a default export. export const is a named export that exports a const declaration or declarations. To emphasize: what matters here is the export keyword as const is used to declare a const declaration or declarations. export may also be applied to other declarations such as class or function declarations. … Read more
I don’t think this is possible, but afaik the resolution of module names is up to module loaders so there might a loader implementation that does support this. Until then, you could use an intermediate “module file” at lib/things/index.js that just contains export * from ‘ThingA’; export * from ‘ThingB’; export * from ‘ThingC’; and … Read more
Node.js has included experimental support for ES6 support. Read more about here: https://nodejs.org/docs/latest-v13.x/api/esm.html#esm_enabling. TLDR; Node.js >= v13 It’s very simple in Node.js 13 and above. You need to either: Save the file with .mjs extension, or Add { “type”: “module” } in the nearest package.json. You only need to do one of the above to … Read more
defaultMember already is an alias – it doesn’t need to be the name of the exported function/thing. Just do import alias from ‘my-module’; Alternatively you can do import {default as alias} from ‘my-module’; but that’s rather esoteric.