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ESM
A fast, global content delivery network for ES Modules. All modules in NPM are transformed to ESM by esbuild .
Import from URL
import React from 'https://esm.sh/react'
Specify version
import React from 'https://esm.sh/react@17.0.2'
Submodule
import { renderToString } from 'https://esm.sh/react-dom/server'
or import non-module(js) files:
import 'https://esm.sh/tailwindcss/dist/tailwind.min.css'
Specify ESM target
import React from 'https://esm.sh/react?target=es2020'
Avaiable target
: es2015 - es2020, esnext, and deno
Development mode
import React from 'https://esm.sh/react?dev'
Specify external deps
import React from 'https://esm.sh/react@16.14.0'
import useSWR from 'https://esm.sh/swr?deps=react@16.14.0'
Package CSS
import Daygrid from 'https://esm.sh/@fullcalendar/daygrid'
<link rel="styelsheet" href="https://esm.sh/@fullcalendar/daygrid?css">
Deno compatibility
esm.sh will replace the node internal modules (fs, os, etc) with deno.land/std/node
to support some packages working in Deno, like postcss
:
import postcss from 'https://esm.sh/postcss'
import autoprefixer from 'https://esm.sh/autoprefixer'
console.log((await postcss([ autoprefixer ]).process(`
backdrop-filter: blur(5px);
user-select: none;
`).async()).css)
X-Typescript-Types
By default, esm.sh will response a custom HTTP header of X-TypeScript-Types
when the types(dts) defined, that is useful for deno types check (link).
You can pass the no-check
query to disable the X-TypeScript-Types
header if some types are incorrect:
import unescape from 'https://esm.sh/lodash/unescape?no-check'
Network of esm.sh
- Main server in HK
- Global CDN by Cloudflare
- China CDN by Aliyun (using mmdb_china_ip_list to split traffic)
Self-Hosting
You will need Go 1.16+ to compile the server, and ensure supervisor installed on your host machine.
The server runtime will install the latest nodejs (14+ LTS) automatically.
$ git clone https://github.com/postui/esm.sh
$ cd esm.sh
$ sh ./scripts/deploy.sh