How can I conditionally apply a plugin in Vite depending on build type?

I am using Vite to build an Ionic React app, which has three versions:

• iOS
• Android
• PWA

I'm using vite-plugin-compression2 to gzip the PWA files.

Here's my vite.config.ts:

  plugins: [
    eslint(),
    compression({
      algorithm: 'gzip',
      exclude: [/\.(br)$ /, /\.(gz)$/],
    }),
    // Deleting the originals will break the PWA because index.html gets deleted.
    compression({
      algorithm: 'brotliCompress',
      exclude: [/\.(br)$ /, /\.(gz)$/],
      deleteOriginalAssets: false,
    }),

The problem is that this compression breaks my Android build, because Android's gradle attempts to compress the already compressed files, which gives a duplicate resources error and aborts the build.

So I want to apply the compression plugin for the PWA and iOS, but not for Android. How can I do that?

The Vite documentation describes conditional application of plugins for build/serve, but I need conditional application for two different ways to build.

I solved this by adding an environmental variable, VITE_BUILD_PWA.

// https://vitejs.dev/config/
export default ({ mode }) => {
  // Make Vite env vars available.
  // https://stackoverflow.com/a/66389044
  process.env = { ...process.env, ...loadEnv(mode, process.cwd()) };
  const isEnvBuildPwa = () => process.env.VITE_BUILD_PWA === 'true';

  return defineConfig({
    build: {
        // All the build config.
      },
    },
    plugins: [
      eslint(),
      isEnvBuildPwa() && compression({
        algorithm: 'gzip',
        exclude: [/\.(br)$ /, /\.(gz)$/],
      }),
      // Deleting the originals will break the PWA because index.html gets deleted.
      isEnvBuildPwa() && compression({
        algorithm: 'brotliCompress',
        exclude: [/\.(br)$ /, /\.(gz)$/],
        deleteOriginalAssets: false,
      }),
    ],
  });
};