0.3.4 • Public • Published


@formatjs/swc-plugin-experimental is a port of babel-plugin-formatjs written in Rust, for the SWC's experimental plugin system. Transform can currently be performed via SWC's wasm-based plugin, and in the future also as a custom pass in Rust-side transform chains.

What does compatible exactly means?

This plugin attempts to mimic most of defined behavior of original plugin's test fixture. However, due to differences of plugin interfaces, as well as known limitations there are numbers of unsupported features with differences. You may able to check the list of github issues, as well as checking test fixtures.

Notably, any dynamic configuration options (overrideFn, onMsg...) are not supported, and few internal behaviors relying on static evaluation won't work.

NOTE: Package can have breaking changes without major semver bump

Given SWC's plugin interface itself is under experimental stage does not gaurantee semver-based major bump yet, this package also does not gaurantee semver compliant breaking changes yet. Please refer changelogs if you're encountering unexpected breaking behavior across versions.

Also, current implementation is largely unoptimized, and may have performance issues as initial focus was to pass existing test fixtures only.


Using SWC's wasm-based experimental plugin

First, install package via npm:

npm install --save-dev @formatjs/swc-plugin-experimental

Then add plugin into swc's configuration:

interface PluginOptions {
  pragma: string
  removeDefaultMessage: bool
  idInterpolationPattern?: string
  ast: bool
  extractSorceLocation: bool
  preserveWhitespace: bool
  additionalFunctionNames: Array<string>
  additionalComponentNames: Array<string>

jsc: {
  // ...
  experimental: {
    plugins: [
          // PluginOptions


npm i @formatjs/swc-plugin-experimental

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