Error [ERR_REQUIRE_ESM]: How to use es6 modules in node 12?

Question

From https://2ality.com/2019/04/nodejs-esm-impl.html Node 12 should support es6 modules; however, I just keep getting the error:

Question: How do I make a MVP of using es6 modules in node 12?

package.json

{   "name": "dynamic-es6-mod",   "version": "1.0.0",   "description": "",   "main": "src/index.mjs",   "scripts": {     "test": "echo \"Error: no test specified\" && exit 1",     "start": "node src/index.mjs"   },   "keywords": [],   "author": "",   "license": "ISC",   "dependencies": {     "globby": "^10.0.1"   } } 

$ node -v $ 12.6.0 $ npm run start   internal/modules/cjs/loader.js:821   throw new ERR_REQUIRE_ESM(filename); Error [ERR_REQUIRE_ESM]: Must use import to load ES Module: /Users/dev/dynamic-es6-mod/src/index.mjs     at Object.Module._extensions..mjs (internal/modules/cjs/loader.js:821:9)     at Module.load (internal/modules/cjs/loader.js:643:32)     at Function.Module._load (internal/modules/cjs/loader.js:556:12)     at Function.Module.runMain (internal/modules/cjs/loader.js:839:10)     at internal/main/run_main_module.js:17:11 

Answer 1

All you have to do is adding the flag --experimental-modules that supports the new es6 import/export statement also the order is important as the following.

    "start": "node --experimental-modules src/index.mjs " 

Answer 2

In Node 14 I solved it with workaround.

source of workaround: https://github.com/eslint/eslint/issues/12319#issuecomment-535799024

short summary:

1. your root level package.json doesn't support ESM
2. subdirectory does - in src directory place package.json with { "type": "module" }

PS: ESLint team can't solve it easily right now, just because of core design... :(