Note
You are on the development (v2) branch. Check out v1 for the current release.
unenv provides polyfills to add Node.js compatibility for any JavaScript runtime, including browsers and edge workers.
The defineEnv
utility can generate a target environment configuration.
import { defineEnv } from "unenv"; const { env } = defineEnv({ nodeCompat: true, npmShims: true, resolve: true, overrides: {}, presets: [], }); const { alias, inject, external, polyfill } = env;
You can then integrate the env object with your build tool:
nodeCompat
: (default: true
)
alias
entries for Node.js builtins as <id>
and node:<id>
.inject
entries for Node.js globals global
, Buffer
, and process
.npmShims
: (default: false
)
alias
entries to replace npm packages like node-fetch
with lighter shims.resolve
: (default: false
) Resolve config values to absolute paths.overrides
: Additional overrides for env config.presets
: Additional presets (for example @cloudflare/unenv-preset
).You can also directly import unenv/
polyfills:
unenv
replaces Node.js built-in modules compatible with any runtime (view source).
// Magic proxy to replace any unknown API import MockProxy from "unenv/mock/proxy"; // You can also create named mocks const lib = MockProxy.__createMock__("lib", { /* overrides */ });
You can use the nightly release channel to try the latest changes in the main
branch via unenv-nightly
.
If directly using unenv
in your project:
{ "devDependencies": { "unenv": "npm:unenv-nightly" } }
If using unenv
via another tool (Nuxt or Nitro) in your project:
{ "resolutions": { "unenv": "npm:unenv-nightly" } }
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