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node_modules/@fluentui/react/monosize.config.mjs

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+// @ts-check
+
+import webpackBundler from 'monosize-bundler-webpack';
+
+import baseConfig from '../../monosize.config.mjs';
+
+/** @type {import('monosize').MonoSizeConfig} */
+const monosizeConfig = {
+  ...baseConfig,
+  bundler: webpackBundler(config => {
+    const normalizedTarget = /** @type {string[]}*/ (Array.isArray(config.target) ? config.target : [config.target]);
+    config.target = [
+      ...normalizedTarget,
+      /**
+       * As of webpack 5, you have to add the `es5` target for IE 11 compatibility.
+       * Otherwise it will output lambdas for smaller bundle size.
+       * @see https://webpack.js.org/migrate/5/#need-to-support-an-older-browser-like-ie-11
+       *
+       * NOTE: IE 11 compat is still needed? for fluentui/react (v8) ?
+       */
+      'es5',
+    ];
+
+    return config;
+  }),
+};
+
+export default monosizeConfig;