Lexical: Imported core lexical libs

Imported at 0.17.1, Modified to work in-app.
Added & configured test dependancies.
Tests need to be altered to avoid using non-included deps including
react dependancies.

resources/js/wysiwyg/lexical/core/LexicalConstants.ts

@@ -0,0 +1,145 @@
+/**
+ * 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 type {ElementFormatType} from './nodes/LexicalElementNode';
+import type {
+  TextDetailType,
+  TextFormatType,
+  TextModeType,
+} from './nodes/LexicalTextNode';
+
+import {
+  IS_APPLE_WEBKIT,
+  IS_FIREFOX,
+  IS_IOS,
+  IS_SAFARI,
+} from 'lexical/shared/environment';
+
+// DOM
+export const DOM_ELEMENT_TYPE = 1;
+export const DOM_TEXT_TYPE = 3;
+
+// Reconciling
+export const NO_DIRTY_NODES = 0;
+export const HAS_DIRTY_NODES = 1;
+export const FULL_RECONCILE = 2;
+
+// Text node modes
+export const IS_NORMAL = 0;
+export const IS_TOKEN = 1;
+export const IS_SEGMENTED = 2;
+// IS_INERT = 3
+
+// Text node formatting
+export const IS_BOLD = 1;
+export const IS_ITALIC = 1 << 1;
+export const IS_STRIKETHROUGH = 1 << 2;
+export const IS_UNDERLINE = 1 << 3;
+export const IS_CODE = 1 << 4;
+export const IS_SUBSCRIPT = 1 << 5;
+export const IS_SUPERSCRIPT = 1 << 6;
+export const IS_HIGHLIGHT = 1 << 7;
+
+export const IS_ALL_FORMATTING =
+  IS_BOLD |
+  IS_ITALIC |
+  IS_STRIKETHROUGH |
+  IS_UNDERLINE |
+  IS_CODE |
+  IS_SUBSCRIPT |
+  IS_SUPERSCRIPT |
+  IS_HIGHLIGHT;
+
+// Text node details
+export const IS_DIRECTIONLESS = 1;
+export const IS_UNMERGEABLE = 1 << 1;
+
+// Element node formatting
+export const IS_ALIGN_LEFT = 1;
+export const IS_ALIGN_CENTER = 2;
+export const IS_ALIGN_RIGHT = 3;
+export const IS_ALIGN_JUSTIFY = 4;
+export const IS_ALIGN_START = 5;
+export const IS_ALIGN_END = 6;
+
+// Reconciliation
+export const NON_BREAKING_SPACE = '\u00A0';
+const ZERO_WIDTH_SPACE = '\u200b';
+
+// For iOS/Safari we use a non breaking space, otherwise the cursor appears
+// overlapping the composed text.
+export const COMPOSITION_SUFFIX: string =
+  IS_SAFARI || IS_IOS || IS_APPLE_WEBKIT
+    ? NON_BREAKING_SPACE
+    : ZERO_WIDTH_SPACE;
+export const DOUBLE_LINE_BREAK = '\n\n';
+
+// For FF, we need to use a non-breaking space, or it gets composition
+// in a stuck state.
+export const COMPOSITION_START_CHAR: string = IS_FIREFOX
+  ? NON_BREAKING_SPACE
+  : COMPOSITION_SUFFIX;
+const RTL = '\u0591-\u07FF\uFB1D-\uFDFD\uFE70-\uFEFC';
+const LTR =
+  'A-Za-z\u00C0-\u00D6\u00D8-\u00F6' +
+  '\u00F8-\u02B8\u0300-\u0590\u0800-\u1FFF\u200E\u2C00-\uFB1C' +
+  '\uFE00-\uFE6F\uFEFD-\uFFFF';
+
+// eslint-disable-next-line no-misleading-character-class
+export const RTL_REGEX = new RegExp('^[^' + LTR + ']*[' + RTL + ']');
+// eslint-disable-next-line no-misleading-character-class
+export const LTR_REGEX = new RegExp('^[^' + RTL + ']*[' + LTR + ']');
+
+export const TEXT_TYPE_TO_FORMAT: Record<TextFormatType | string, number> = {
+  bold: IS_BOLD,
+  code: IS_CODE,
+  highlight: IS_HIGHLIGHT,
+  italic: IS_ITALIC,
+  strikethrough: IS_STRIKETHROUGH,
+  subscript: IS_SUBSCRIPT,
+  superscript: IS_SUPERSCRIPT,
+  underline: IS_UNDERLINE,
+};
+
+export const DETAIL_TYPE_TO_DETAIL: Record<TextDetailType | string, number> = {
+  directionless: IS_DIRECTIONLESS,
+  unmergeable: IS_UNMERGEABLE,
+};
+
+export const ELEMENT_TYPE_TO_FORMAT: Record<
+  Exclude<ElementFormatType, ''>,
+  number
+> = {
+  center: IS_ALIGN_CENTER,
+  end: IS_ALIGN_END,
+  justify: IS_ALIGN_JUSTIFY,
+  left: IS_ALIGN_LEFT,
+  right: IS_ALIGN_RIGHT,
+  start: IS_ALIGN_START,
+};
+
+export const ELEMENT_FORMAT_TO_TYPE: Record<number, ElementFormatType> = {
+  [IS_ALIGN_CENTER]: 'center',
+  [IS_ALIGN_END]: 'end',
+  [IS_ALIGN_JUSTIFY]: 'justify',
+  [IS_ALIGN_LEFT]: 'left',
+  [IS_ALIGN_RIGHT]: 'right',
+  [IS_ALIGN_START]: 'start',
+};
+
+export const TEXT_MODE_TO_TYPE: Record<TextModeType, 0 | 1 | 2> = {
+  normal: IS_NORMAL,
+  segmented: IS_SEGMENTED,
+  token: IS_TOKEN,
+};
+
+export const TEXT_TYPE_TO_MODE: Record<number, TextModeType> = {
+  [IS_NORMAL]: 'normal',
+  [IS_SEGMENTED]: 'segmented',
+  [IS_TOKEN]: 'token',
+};