2024-02-17 19:55:56 +01:00
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---
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title: esm
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2024-03-17 19:19:56 +01:00
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jargon: true
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2024-02-17 19:55:56 +01:00
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---
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**esm** stands for **ECMAScript Modules** and is the official module system of
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the JavaScript language, supported both in the browser, and on the server.
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While ESM is the official standard, before it existed people would typically use CJS outside the browser, as it was popularized by NodeJS.
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Some libraries still are not available in ESM, but FreeSewing has been ESM-only since version 3.
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ESM uses the **import** keyword to import modules:
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```js
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import fs from 'fs'
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```
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