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path: root/frontend/rollup.config.js
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import commonjs from '@rollup/plugin-commonjs';
import image from '@rollup/plugin-image';
import json from '@rollup/plugin-json';
import { nodeResolve } from '@rollup/plugin-node-resolve';
import replace from '@rollup/plugin-replace';
import typescript from '@rollup/plugin-typescript';
import { defineConfig } from 'rollup';
import del from 'rollup-plugin-delete';
import externalGlobals from 'rollup-plugin-external-globals';
import { visualizer } from 'rollup-plugin-visualizer';

const hiddenWarnings = ['THIS_IS_UNDEFINED', 'EVAL'];

export default defineConfig([
  // Main bundle
  {
    input: 'src/index.ts',
    plugins: [
      del({ targets: ['../backend/decky_loader/static/*', '!../backend/decky_loader/static/fallback.js'], force: true }),
      commonjs(),
      nodeResolve({
        browser: true,
      }),
      externalGlobals({
        react: 'SP_REACT',
        'react-dom': 'SP_REACTDOM',
        // hack to shut up react-markdown
        process: '{cwd: () => {}}',
        path: '{dirname: () => {}, join: () => {}, basename: () => {}, extname: () => {}}',
        url: '{fileURLToPath: (f) => f}',
      }),
      typescript(),
      json(),
      replace({
        preventAssignment: false,
        'process.env.NODE_ENV': JSON.stringify('production'),
      }),
      image(),
      visualizer(),
    ],
    preserveEntrySignatures: false,
    treeshake: {
      // Assume all external modules have imports with side effects (the default) while allowing decky libraries to treeshake
      pureExternalImports: true,
      preset: 'smallest'
    },
    output: {
      dir: '../backend/decky_loader/static',
      format: 'esm',
      chunkFileNames: (chunkInfo) => {
        return 'chunk-[hash].js';
      },
      sourcemap: true,
      sourcemapPathTransform: (relativeSourcePath) => relativeSourcePath.replace(/^\.\.\//, `decky://decky/loader/`),
    },
    onwarn: function (message, handleWarning) {
      if (hiddenWarnings.some((warning) => message.code === warning)) return;
      handleWarning(message);
    },
  },
  // Fallback
  {
    input: 'src/fallback.ts',
    plugins: [
      typescript()
    ],
    output: {
      file: '../backend/decky_loader/static/fallback.js',
      format: 'esm',
    }
  }
]);