vite.config.ts

import { defineConfig } from 'vite';
import react from '@vitejs/plugin-react';
import { resolve } from 'path';
import dts from 'vite-plugin-dts';

// Use DEBUG=1 to generate sourcemaps and disable minification for debugging
const isDebug = process.env.DEBUG === '1';

export default defineConfig({
  plugins: [
    react(),
    dts({
      include: ['src'],
      outDir: 'dist/types',
      rollupTypes: false,
    }),
  ],
  optimizeDeps: {
    esbuildOptions: {
      // Avoid downleveling class fields in maplibre-gl worker bundle (prevents __publicField errors).
      target: 'es2022',
    },
  },
  resolve: {
    alias: {
      '@': resolve(__dirname, 'src'),
    },
  },
  build: {
    lib: {
      entry: {
        index: resolve(__dirname, 'src/index.ts'),
        react: resolve(__dirname, 'src/react.ts'),
      },
      name: 'MapLibreGLComponents',
      formats: ['es', 'cjs'],
      fileName: (format, entryName) => {
        const ext = format === 'es' ? 'mjs' : 'cjs';
        return `${entryName}.${ext}`;
      },
    },
    rollupOptions: {
      // External packages that should not be bundled
      // shpjs and @duckdb/duckdb-wasm are optional dependencies loaded at runtime
      // @deck.gl/*, @luma.gl/*, @loaders.gl/*, @math.gl/*, @probe.gl/*, three,
      // @dvt3d/*, @developmentseed/deck.gl-*, and @carbonplan/* are peer dependencies
      // to avoid double initialization of luma.gl when consumers also use these packages
      external: [
        'react',
        'react-dom',
        'maplibre-gl',
        'shpjs',
        '@duckdb/duckdb-wasm',
        'jspdf',
        /^@deck\.gl\//,
        /^@luma\.gl\//,
        /^@loaders\.gl\//,
        /^@math\.gl\//,
        /^@probe\.gl\//,
        'three',
        /^@dvt3d\//,
        /^@developmentseed\//,
        /^@carbonplan\//,
      ],
      onwarn(warning, defaultHandler) {
        // Suppress "spawn" not exported warning from @loaders.gl/worker-utils
        // (it imports Node.js child_process which doesn't exist in browser builds)
        if (warning.code === 'MISSING_EXPORT' && warning.message.includes('"spawn"')) return;
        defaultHandler(warning);
      },
      output: {
        globals: {
          react: 'React',
          'react-dom': 'ReactDOM',
          'maplibre-gl': 'maplibregl',
        },
        assetFileNames: (assetInfo) => {
          if (assetInfo.name === 'style.css') return 'maplibre-gl-components.css';
          return assetInfo.name || '';
        },
      },
    },
    cssCodeSplit: false,
    // Production: no sourcemaps, minified for smaller package size
    // Debug: sourcemaps enabled, no minification for easier debugging
    // Use `DEBUG=1 npm run build` to generate debuggable artifacts
    sourcemap: isDebug,
    minify: isDebug ? false : 'esbuild',
  },
});