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build(web): run the React Compiler on worker threads #727

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Merged
badcuban merged 1 commit into from
Oct 31, 2026
Merged

build(web): run the React Compiler on worker threads #727

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20 changes: 18 additions & 2 deletions apps/web/vite.config.ts
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
import { fileURLToPath } from "node:url";
import tailwindcss from "@tailwindcss/vite";
import react, { reactCompilerPreset } from "@vitejs/plugin-react";
import babel from "@rolldown/plugin-babel";
import babel, { type RolldownBabelPreset } from "@rolldown/plugin-babel";
import { tanstackRouter } from "@tanstack/router-plugin/vite";
import { resolveGitReleaseVersion } from "@threadlines/shared/gitVersion";
import { defineProject, type TestProjectInlineConfiguration } from "vite-plus/test/config";
Expand Down Expand Up @@ -128,6 +128,19 @@ const unitTestProject = {
},
} satisfies TestProjectInlineConfiguration;

/**
* plugin-react's React Compiler preset with its Babel half (a function that
* names the compiler plugin) called here, so the preset is plain data that
* plugin-babel can send to its worker threads. Its filters and hooks stay in
* this process.
*/
function reactCompilerWorkerPreset(): RolldownBabelPreset {
const compiler = reactCompilerPreset();
return typeof compiler.preset === "function"
? { ...compiler, preset: compiler.preset() }
: compiler;
}

export function createWebPlugins(options?: {
readonly routerAutoCodeSplitting?: boolean;
}): PluginOption[] {
Expand All @@ -145,7 +158,10 @@ export function createWebPlugins(options?: {
// whereas the previous version of the plugin parsed all files with a .ts extension.
// This caused our packages/ directory to fail to parse, as they are not relative to the CWD.
parserOpts: { plugins: ["typescript", "jsx"] },
presets: [reactCompilerPreset()],
presets: [reactCompilerWorkerPreset()],
// Babel (the React Compiler) is most of a build's time; run it on up
// to four worker threads.
parallel: true,
exclude: [
// The plugin's default, which an explicit exclude replaces.
/[/\\]node_modules[/\\]|^\0rolldown\/runtime\.js$/,
Expand Down