ESM changes

[niksy]

• "type": "module" in package.json nodejs/node@b1094db
  • Don’t do this for now, see: https://medium.com/@nodejs/announcing-a-new-experimental-modules-1be8d2d6c2ff#576c
• https://2ality.com/2019/10/hybrid-npm-packages.html
• https://2ality.com/2019/04/nodejs-esm-impl.html
• https://twitter.com/ehmicky/status/1199777158828380163?s=12
• https://twitter.com/rauschma/status/1204601989537128450?s=12
• https://twitter.com/webreflection/status/1235537753690890240?s=12
• https://medium.com/@WebReflection/a-nodejs-dual-module-deep-dive-8f94ff56210e
• https://twitter.com/_developit/status/1263174528974364675?s=12
• https://github.com/addaleax/gen-esm-wrapper
• https://github.com/WICG/import-maps
• https://twitter.com/mikeal/status/1275524387765026816?s=12
• https://twitter.com/getify/status/1275522013084483596?s=12
• https://dev.to/mikeal_2/native-esm-in-node-js-w-require-fallbacks-and-support-for-all-front-end-compilers-2ded
• https://dev.to/mikeal_2/native-esm-in-node-js-w-require-fallbacks-and-support-for-all-front-end-compilers-2ded
• https://redfin.engineering/node-modules-at-war-why-commonjs-and-es-modules-cant-get-along-9617135eeca1
• Package/ESM compatibility linter (completed 💚) sindresorhus/project-ideas#116
• Node and browser builds with ES Modules

---

Use .mjs extension for ES Modules

• https://medium.com/@giltayar/native-es-modules-in-nodejs-status-and-future-directions-part-i-ee5ea3001f71#ba6b
• Use .mjs extension for module main output developit/microbundle#165
• ESLint, Rollup, Karma, WebdriverIO, gulpfile

---

Additional information:

• Respect "exports" field in "package.json" webpack/webpack#9509
• Support "exports" field in package.json rollup/plugins#208
• https://nodejs.org/api/esm.html
• https://nodejs.org/api/modules.html

[niksy]

https://dev.to/mikeal_2/native-esm-in-node-js-w-require-fallbacks-and-support-for-all-front-end-compilers-2ded
https://redfin.engineering/node-modules-at-war-why-commonjs-and-es-modules-cant-get-along-9617135eeca1
sindresorhus/project-ideas#116
webpack/webpack#4674 (comment)
https://github.com/multiformats/js-multiformats/blob/master/package.json
https://nodejs.org/api/packages.html#packages_package_entry_points
https://nodejs.org/api/packages.html#packages_dual_commonjs_es_module_packages
https://medium.com/@WebReflection/a-nodejs-dual-module-deep-dive-8f94ff56210e
https://twitter.com/webreflection/status/1235537753690890240?s=12
https://2ality.com/2019/10/hybrid-npm-packages.html

cjs and esm folder, type field

--experimental-modules

{
	"type": "module",
	"main": "./index.cjs.js",
	"module": "./index.esm.js",
	"exports": {
		".": {
			"import": "./index.esm.js",
			"require": "./index.cjs.js",
			"browser": "./index.browser.esm.js",
			"default": "./index.cjs.js",
		},
		"./throttle.js": {
			"import": "./throttle.esm.js",
			"require": "./throttle.cjs.js",
			"browser": "./throttle.browser.esm.js",
			"default": "./throttle.cjs.js",
		},
		"./debounce.js": {
			"import": "./debounce.esm.js",
			"require": "./debounce.cjs.js",
			"browser": "./debounce.browser.esm.js",
			"default": "./debounce.cjs.js",
		}
	},
	"browser": {
		"./index.esm.js": "./index.browser.esm.js",
		"./throttle.esm.js": "./throttle.browser.esm.js",
		"./debounce.esm.js": "./debounce.browser.esm.js"
	}
}