refactor: lexical (#1954)

packages/blocks-editor/src/Lexical/Shared/canUseDOM.ts

@@ -0,0 +1,12 @@
+/**
+ * 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.
+ *
+ */
+
+export const CAN_USE_DOM: boolean =
+  typeof window !== 'undefined' &&
+  typeof window.document !== 'undefined' &&
+  typeof window.document.createElement !== 'undefined';

packages/blocks-editor/src/Lexical/Shared/environment.ts

@@ -0,0 +1,46 @@
+/**
+ * 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.
+ *
+ */
+
+import {CAN_USE_DOM} from './canUseDOM';
+
+declare global {
+  interface Document {
+    documentMode?: string;
+  }
+
+  interface Window {
+    MSStream?: unknown;
+  }
+}
+
+const documentMode =
+  CAN_USE_DOM && 'documentMode' in document ? document.documentMode : null;
+
+export const IS_APPLE: boolean =
+  CAN_USE_DOM && /Mac|iPod|iPhone|iPad/.test(navigator.platform);
+
+export const IS_FIREFOX: boolean =
+  CAN_USE_DOM && /^(?!.*Seamonkey)(?=.*Firefox).*/i.test(navigator.userAgent);
+
+export const CAN_USE_BEFORE_INPUT: boolean =
+  CAN_USE_DOM && 'InputEvent' in window && !documentMode
+    ? 'getTargetRanges' in new window.InputEvent('input')
+    : false;
+
+export const IS_SAFARI: boolean =
+  CAN_USE_DOM && /Version\/[\d.]+.*Safari/.test(navigator.userAgent);
+
+export const IS_IOS: boolean =
+  CAN_USE_DOM &&
+  /iPad|iPhone|iPod/.test(navigator.userAgent) &&
+  !window.MSStream;
+
+// Keep these in case we need to use them in the future.
+// export const IS_WINDOWS: boolean = CAN_USE_DOM && /Win/.test(navigator.platform);
+// export const IS_CHROME: boolean = CAN_USE_DOM && /^(?=.*Chrome).*/i.test(navigator.userAgent);
+// export const canUseTextInputEvent: boolean = CAN_USE_DOM && 'TextEvent' in window && !documentMode;

packages/blocks-editor/src/Lexical/Shared/invariant.ts

@@ -0,0 +1,17 @@
+// invariant(condition, message) will refine types based on "condition", and
+// if "condition" is false will throw an error. This function is special-cased
+// in flow itself, so we can't name it anything else.
+export default function invariant(
+  cond?: boolean,
+  message?: string,
+  ...args: string[]
+): asserts cond {
+  if (cond) {
+    return;
+  }
+
+  throw new Error(
+    'Internal Lexical error: invariant() is meant to be replaced at compile ' +
+      'time. There is no runtime version.',
+  );
+}