Option to load only specific plugins in dev mode

Summary: Currently we load all the plugins even if they are not required in dev mode, e.g. when you are developing a specific plugin. This diff adds an env var and command-line option to specify exact list of plugins to load. This makes dev mode startup faster and consume less memory.

Reviewed By: passy

Differential Revision: D24394146

fbshipit-source-id: 42a78c1ffb2632e657c2411e34e9c80fff18df3a

desktop/plugin-lib/src/getSourcePlugins.ts

@@ -29,7 +29,21 @@ export async function getSourcePlugins(): Promise<PluginDetails[]> {
       entryPoints[key] = p[key];
     });
   }
-  return Object.values(entryPoints);
+  const allPlugins = Object.values(entryPoints);
+  if (process.env.FLIPPER_ENABLED_PLUGINS) {
+    const pluginNames = new Set<string>(
+      process.env.FLIPPER_ENABLED_PLUGINS.split(',').map((x) =>
+        x.toLowerCase(),
+      ),
+    );
+    return allPlugins.filter(
+      (x) =>
+        pluginNames.has(x.name) ||
+        pluginNames.has(x.id) ||
+        pluginNames.has(x.name.replace('flipper-plugin-', '')),
+    );
+  }
+  return allPlugins;
 }
 async function entryPointForPluginFolder(
   pluginsDir: string,