Gathering detailed insights and metrics for esm
@esbuild-kit/esm-loader
Node.js loader for compiling TypeScript modules to ESM
is-file-esm
Determines whether a Node file is a Module (`import`) or a Script (`require`)
@humanwhocodes/module-importer
Universal module importer for Node.js
mdast-util-mdxjs-esm
mdast extension to parse and serialize MDX.js ESM (import/exports)
npm install esmTypescript
Module System
Min. Node Version
Node Version
NPM Version
97.2
Supply Chain
88.7
Quality
75.9
Maintenance
100
Vulnerability
100
License
JavaScript (99.87%)
WebAssembly (0.08%)
TypeScript (0.05%)
Total Downloads
566,936,878
Last Day
197,281
Last Week
1,196,959
Last Month
9,742,253
Last Year
133,581,579
5,275 Stars
6,378 Commits
147 Forks
57 Watching
1 Branches
29 Contributors
Minified
Minified + Gzipped
Latest Version
3.2.25
Package Id
esm@3.2.25
Size
89.29 kB
NPM Version
6.9.0
Node Version
12.2.0
Publised On
17 May 2019
Cumulative downloads
Total Downloads
Last day
-11%
197,281
Compared to previous day
Last week
-43.5%
1,196,959
Compared to previous week
Last month
-16.2%
9,742,253
Compared to previous month
Last year
12.1%
133,581,579
Compared to previous year
No dependencies detected.
The brilliantly simple, babel-less, bundle-less ECMAScript module loader.
esmis the world’s most advanced ECMAScript module loader. This fast, production ready, zero dependency loader is all you need to support ECMAScript modules in Node 6+. See the release post and video for details!
New projects
Run npm init esm or yarn create esm.
:bulb: Use the -y flag to answer “yes” to all prompts.
Existing projects
Run npm i esm or yarn add esm.
There are two ways to enable esm.
Enable esm for packages:
Use esm to load the main ES module and export it as CommonJS.
index.js
1// Set options as a parameter, environment variable, or rc file. 2require = require("esm")(module/*, options*/) 3module.exports = require("./main.js")
main.js
1// ESM syntax is supported. 2export {}
:bulb: These files are automagically created with npm init esm or yarn create esm.
Enable esm for local runs:
1node -r esm main.js
:bulb: Omit the filename to enable esm in the REPL.
:clap: By default, :100: percent CJS interoperability is enabled so you can get stuff done.
:lock: .mjs files are limited to basic functionality without support for esm options.
Out of the box esm just works, no configuration necessary, and supports:
import/exportimport.metaimportstdin, --eval, --print flags--check flag (Node 10+)Specify options with one of the following:
"esm" field in package.json.esmrc.js, .esmrc.cjs, or .esmrc.mjs file.esmrc or .esmrc.json fileESM_OPTIONS environment variableESM_DISABLE_CACHE environment variable{ | |||||||||||||||||||||||
"cjs":true | A boolean or object for toggling CJS features in ESM. Features
| ||||||||||||||||||||||
"mainFields":["main"] | An array of fields checked when importing a package. | ||||||||||||||||||||||
"mode":"auto" | A string mode:
| ||||||||||||||||||||||
"await":false | A boolean for top-level | ||||||||||||||||||||||
"force":false | A boolean to apply these options to all module loads. | ||||||||||||||||||||||
"wasm":false | A boolean for WebAssembly module support. (Node 8+) | ||||||||||||||||||||||
} | |||||||||||||||||||||||
{ | |
"cache":true | A boolean for toggling cache creation or a cache directory path. |
"sourceMap":false | A boolean for including inline source maps. |
} | |
For bundlers like browserify+esmify,
parcel-bundler, and webpack
add a "module" field to package.json pointing to the main ES module.
1"main": "index.js", 2"module": "main.js"
:bulb: This is automagically done with npm init esm or yarn create esm.
esm for wallaby.js following their
integration example.Load esm before loaders/monitors like
@babel/register,
newrelic,
sqreen, and
ts-node.
Load esm for jasmine using the
"helpers"
field in jasmine.json:
1"helpers": [ 2 "node_modules/esm" 3]
Load esm with “node-args" options of:
pm2: --node-args="-r esm"Load esm with “require” options of
ava,
mocha,
nodemon,
nyc,
qunit,
tape, and
webpack.
:bulb: Builtin require cannot sideload .mjs files. However, .js files
can be sideloaded or .mjs files may be loaded with dynamic import.
Stable Version
1
0/10
Summary
Regular Expression Denial of Service
Affected Versions
< 3.1.0
Patched Versions
3.1.0
Reason
license file detected
Details
Reason
binaries present in source code
Details
Reason
Found 4/30 approved changesets -- score normalized to 1
Reason
project is archived
Details
Reason
no effort to earn an OpenSSF best practices badge detected
Reason
security policy file not detected
Details
Reason
project is not fuzzed
Details
Reason
branch protection not enabled on development/release branches
Details
Reason
SAST tool is not run on all commits -- score normalized to 0
Details
Reason
102 existing vulnerabilities detected
Details
Score
Last Scanned on 2025-01-06
The Open Source Security Foundation is a cross-industry collaboration to improve the security of open source software (OSS). The Scorecard provides security health metrics for open source projects.
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