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jakub-g/es-modules-tooling-config.md

Last active March 2, 2021 21:22
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Configure popular tools to work with ES modules
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es-modules-tooling-config.md

Things to do before you start using ES modules and put "type": "module" in package.json

The correct behavior of all tools is to assume that .js files are in ES modules format. Hence you must convert existing .js files (including config files) to ESM format, or rename them to .cjs if you want to keep them intact.

eslint, prettier

You should rename .eslintrc.js/.prettierrc.js to .cjs extension, or make them a valid JSON with .json extension

doc: eslint prettier

mocha

.js and .mjs test files work out of the box as ESM; .cjs works as CJS

jasmine

Non-compliant: .js files do not work correctly. See https://gist.github.com/jakub-g/a5b17be90f42fe74d6f980e353e80143

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