Back out "fallback to handle plugins as commonjs if dynamic import fails"

Summary:
Original commit changeset: edef9999ad44

Original Phabricator Diff: D50081726

Reviewed By: passy, lblasa

Differential Revision: D50168200

fbshipit-source-id: ba96101bc63409af8ec81857efa81e5aeeb0e3cb

desktop/flipper-ui-browser/src/initializeRenderHost.tsx

@@ -185,48 +185,11 @@ export function initializeRenderHost(
       // Typescript transpiles dynamic import calls to `require` in the browser bundle
       // We want to explicilty use dynamic import here
       const importStr = `import('/${staticPath}?ts=${Date.now()}')`;
-      const nonEsmPluginSymbol = Symbol.for('nonEsmPlugin');
       const source = await flipperServer.exec('plugin-source', path);
       // eslint-disable-next-line no-eval
-      const importRes = await eval(importStr).catch((e: unknown) => {
-        if (
-          e instanceof ReferenceError &&
-          e.message.includes('module is not defined')
-        ) {
-          return nonEsmPluginSymbol;
-        } else {
-          throw e;
-        }
-      });
+      const importRes = await eval(importStr);
 
-      if (importRes !== nonEsmPluginSymbol) {
-        return {plugin: importRes, css: source.css};
-      }
-      // handle commonjs plugin
-      else {
-        console.log(
-          '[browser-ui][requirePlugin] handle plugin js as CJS',
-          // only log path inside of flipper project
-          path.split('/desktop/', 2).pop(),
-        );
-        let js = source.js;
-        // append source url (to make sure a file entry shows up in the debugger)
-        js += `\n//# sourceURL=file://${path}`;
-        if (isProduction()) {
-          // and source map url (to get source code if available)
-          js += `\n//# sourceMappingURL=file://${path}.map`;
-        }
-
-        // Plugins are compiled as typical CJS modules, referring to the global
-        // 'module', which we'll make available by loading the source into a closure that captures 'module'.
-        // Note that we use 'eval', and not 'new Function', because the latter will cause the source maps
-        // to be off by two lines (as the function declaration uses two lines in the generated source)
-        // eslint-disable-next-line no-eval
-        const cjsLoader = eval('(module) => {' + js + '\n}');
-        const theModule = {exports: {}};
-        cjsLoader(theModule);
-        return {plugin: theModule.exports, css: source.css};
-      }
+      return {plugin: importRes, css: source.css};
     },
     getStaticResourceUrl(path): string {
       // the 'static' folder is mounted as static middleware in Express at the root