__dirname 没有定义在 Node.js 10 实验？

Question

I am using Node.js 10.0.0 & my index.mjs looks like:

import path from "path";

console.log(__dirname);

In my terminal, I run

node --experimental-modules index.mjs

And I get the following error:

(node:3750) ExperimentalWarning: The ESM module loader is experimental.
ReferenceError: __dirname is not defined
at file:///MyFolderPath/node-10/index.mjs:3:21
at ModuleJob.run (internal/modules/esm/module_job.js:106:14)

Answer 1

ESM is not node-specific, and node-specific "globals" (such as __dirname and module) will not work. import.meta is expected to provide a suitable replacement.

Source: GitHub issue .

Answer 2

ES6 modules don't define __dirname . You can define it yourself using code like this below. This assumes a filesystem context, not a browser.

import path from 'path';
const __dirname = path.dirname(new URL(import.meta.url).pathname);

See import.meta in the node reference and MDN for specifics.