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rollup.config.js

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+import inject from '@rollup/plugin-inject';
+import { fileURLToPath } from 'node:url';
+import typescript from 'rollup-plugin-typescript2';
+
+/**
+ * @typedef {import('rollup').OutputOptions} OutputOptions
+ * @typedef {import('rollup').RollupOptions} RollupOptions
+ */
+
+/**
+ * @returns {RollupOptions['plugins']!}
+ */
+const commonPlugins = () => [
+  typescript(),
+  inject(
+    Object.fromEntries(
+      ['fetch', 'Request', 'Response', 'WebSocket', 'XMLHttpRequest'].map(
+        (name) => [
+          name,
+          [fileURLToPath(new URL('./src/snapshot.ts', import.meta.url)), name],
+        ]
+      )
+    )
+  ),
+];
+
+/**
+ * @type {RollupOptions[]}
+ */
+const configs = [
+  // import
+  {
+    input: 'src/index.ts',
+    output: {
+      file: `dist/index.js`,
+      format: 'esm',
+      sourcemap: true,
+      exports: 'named',
+    },
+    plugins: commonPlugins(),
+  },
+  // require
+  {
+    input: 'src/index.ts',
+    output: {
+      file: `dist/bare.cjs`,
+      format: 'umd',
+      name: 'bare',
+      sourcemap: true,
+      exports: 'auto',
+    },
+    plugins: commonPlugins(),
+  },
+];
+
+export default configs;