SWC Plugin for ☄️ Effector

A plugin to enhance your ☄️ Effector experience, just like effector/babel-plugin, but Speedy.

Can be used for SSR, debugging and testing in SWC-powered projects, like NextJS or Vite's react-swc plugin. Strives to be compatible with the built-in effector/babel-plugin.

Important

SWC Plugins are currenlty unstable, and @swc/core does not follow semver in plugin compatibility. For more info, see versioning.

⚙️ Get Started

First, install a compatible tag of this package, and pin it:

$ npm install effector-swc-plugin@compatible-tag --save-exact
# or
$ yarn add effector-swc-plugin@compatible-tag --exact
# or
$ pnpm add effector-swc-plugin@compatible-tag --save-exact

Second, add this plugin into your SWC configuration (like .swcrc):

{
  "$schema": "https://json.schemastore.org/swcrc",
  "jsc": {
    "experimental": {
      "plugins": [["effector-swc-plugin", {}]]
    }
  }
}
// You must specify a configuration for a plugin, even if it's empty

Third, run your build tools and enjoy.

🛠️ Configuration

• addNames: boolean (default: true)

  Add name information when calling factories (like createStore or createDomain). Provides excellent debug or QoL information during development/testing, but its best to disable it when using minification.

• addLoc: boolean (default: false)

  Add loc (unit location) information to factories' calls. Useful for debugging and when using devtools, like effector-logger.

• debugSids: boolean (default: false)

  Add a file path and unit name to the end of generated SID. Useful for debugging SSR.

• forceScope: boolean | { hooks: boolean, reflect: boolean } (default: false)

  When enabled, injects forceScope: true into all hooks or @effector/reflect calls, depending on your configuration.

  When forceScope is enabled, it enforces that your app always uses Scope during render. If the Scope is missing, the app will throw an error. This setting completely replaces the requirement for /scope or /ssr imports.

  More about Scope enforcement in documentation.

  • forceScope.hooks: boolean (since v0.2.0)

    hooks: true enforces that all hooks from effector-react and effector-solid, like useUnit and useList, use Scope.

  • forceScope.reflect: boolean (since v0.2.0)

    For @effector/reflect users. If enabled, this option enforces all components created with reflect library also use Scope.

    Note: Only useful for @effector/reflect@>=9.0.0. Versions lower than 9.0.0 do not support forceScope.

  • forceScope: boolean - a shorthand to enable/disable all options

• factories: string[] (default: [])

  An array of module names or files to treat as factories. Only required for SSR.

  A number of community packages (patronum, @farfetched/code, etc.) are included by default, and do not require you to set them explicitly.

  If provided with a relative path (a path starting with ./), plugin will treat this as a local factory residing at a specified path relative to your .swcrc. These factories can be imported using relative imports in your code.

  If provided with other path, like a package name or a TypeScript alias, plugin will treat this as an exact import specifier which your code uses. You can not import this factory using a relative path.

  Relative import example:

  // file: /.swcrc
  ...
  "factories": ["./src/factory"]
  ...
  
  // file: /src/factory.ts
  import { createStore } from "effector";
  
  export const createBooleanStore = () => createStore(true);
  
  // file: /src/widget/user.ts
  import { createBooleanStore } from "../factory"
  
  const $boolean = createBooleanStore() /* Treated as a factory! */

• transformLegacyDomainMethods: boolean (default: true)

  When disabled, stops transforming Unit creators in Domains, like domain.event() or domain.createEffect().

  Transforming such calls relies heavily on guessing, and is known to affect/break code unrelated to Effector. An alternative approach to these methods is to use domain argument in regular methods:

  const domain = createDomain();
  
  // ↓ pass domain as an argument
  const foo = createEvent({ domain });

  Disabling this option will stop adding sids and other debug information into these unit creators. Before turning it off, ensure that your code does not use domain methods.

  Further reading: You Don't Need Domains.

Known differences with effector/babel-plugin

• No support for importName

  By default, the plugin supports effector (+ /compat), effector-root (+ /compat) and effector-logger. This should cover you in most of use cases. If you feel a need for this feature, please open an issue!

• No support for noDefaults

  This is currently only used by library developers, and may be implemented in the future. If you feel you need this feature, please open an issue!

• reactSsr replaced by forceScope

  reactSsr option is deprecated, as well as /scope imports. effector-react supports SSR by default since effector@23.

  If you want to enforce that Scope is never lost in your components, forceScope option in the plugin will do the trick.

Versioning

Because SWC plugins are unstable and experimental, breaking changes can happen in minor/patch releases of @swc/core or underlying swc_core Rust library.

This package will do its best and specify the correct @swc/core in its peerDependencies, so when you use the wrong version, it should say so.

To work around breaking changes, this package publishes different 'labels' for different corresponding @swc/core ranges. To choose an appropriate label, pick your @swc/core / NextJS version from the list.

Always pin your @swc/core and this plugin version for stable behavior.

Choosing the Right Plugin Version:

• Use @0.x.x (no label) for the latest @swc/core.
• Use @0.x.x-swc1.x.x for specific @swc/core versions.

Example:

Available Plugin Version	Compatible @swc/core Versions
@0.x.x-swc1.3.49	1.3.49 to 1.3.57
@0.x.x-swc1.3.58	1.3.58 to 1.3.61
@0.x.x-swc1.3.62 or @0.x.x	1.3.62

For NextJS users

See SWC Documentation "Selecting the version" for detailed info on plugin compatibility. Each NextJS version has a corresponding @swc/core version, which you need to know.

As soon as you know the @swc/core version, follow the rules above to install the plugin.