Split flipper-plugin package

Summary:
flipper-server-companion depends on flipper-plugin. flipper-plugin includes dependencies that run only in a browser. Splitting flipper-plugin into core and browser packages helps to avoid including browser-only dependencies into flipper-server bundle.
As a result, bundle size could be cut in half. Subsequently, RSS usage drops as there is twice as less code to process for V8.

Note: it currently breaks external flipper-data-source package. It will be restored in subsequent diffs

Reviewed By: lblasa

Differential Revision: D38658285

fbshipit-source-id: 751b11fa9f3a2d938ce166687b8310ba8b059dee

desktop/flipper-plugin-core/src/plugin/MenuEntry.tsx

@@ -0,0 +1,59 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+export type MenuEntry = BuiltInMenuEntry | CustomMenuEntry;
+export type DefaultKeyboardAction = keyof typeof buildInMenuEntries;
+
+export type NormalizedMenuEntry = {
+  label: string;
+  accelerator?: string;
+  handler: () => void;
+  action: string;
+};
+
+export type CustomMenuEntry = {
+  label: string;
+  accelerator?: string;
+  handler: () => void;
+};
+
+export type BuiltInMenuEntry = {
+  action: keyof typeof buildInMenuEntries;
+  handler: () => void;
+};
+
+export const buildInMenuEntries = {
+  clear: {
+    label: 'Clear',
+    accelerator: 'CmdOrCtrl+K',
+    action: 'clear',
+  },
+  goToBottom: {
+    label: 'Go To Bottom',
+    accelerator: 'CmdOrCtrl+B',
+    action: 'goToBottom',
+  },
+  createPaste: {
+    label: 'Create Paste',
+    action: 'createPaste',
+  },
+} as const;
+
+export function normalizeMenuEntry(entry: MenuEntry): NormalizedMenuEntry;
+export function normalizeMenuEntry(entry: any): NormalizedMenuEntry {
+  const builtInEntry: NormalizedMenuEntry | undefined = (
+    buildInMenuEntries as any
+  )[entry.action];
+  return builtInEntry
+    ? {...builtInEntry, ...entry}
+    : {
+        ...entry,
+        action: entry.action || entry.label,
+      };
+}