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node_modules/ts-invariant/rollup.config.js

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+import typescriptPlugin from 'rollup-plugin-typescript2';
+import typescript from 'typescript';
+
+const globals = {
+  __proto__: null,
+  tslib: "tslib",
+};
+
+function external(id) {
+  return id in globals;
+}
+
+export default [{
+  input: "src/invariant.ts",
+  external,
+  output: {
+    file: "lib/invariant.esm.js",
+    format: "esm",
+    sourcemap: true,
+    globals,
+  },
+  plugins: [
+    typescriptPlugin({
+      typescript,
+      tsconfig: "./tsconfig.rollup.json",
+    }),
+  ],
+}, {
+  input: "lib/invariant.esm.js",
+  external,
+  output: {
+    // Intentionally overwrite the invariant.js file written by tsc:
+    file: "lib/invariant.js",
+    format: "cjs",
+    exports: "named",
+    sourcemap: true,
+    name: "ts-invariant",
+    globals,
+  },
+}];