Flow: add missing variables and functions

- EditorThemeClasses
- BaseSelection
- NodeSelection
- RangeSelection

packages/lexical/flow/Lexical.js.flow

@@ -262,6 +262,7 @@ export type EditorThemeClasses = {
     ulDepth?: Array<EditorThemeClassName>,
     ol?: EditorThemeClassName,
     olDepth?: Array<EditorThemeClassName>,
+    checklist?: EditorThemeClassName,
     listitem?: EditorThemeClassName,
     listitemChecked?: EditorThemeClassName,
     listitemUnchecked?: EditorThemeClassName,
@@ -451,13 +452,16 @@ declare export function $isBlockElementNode(
 ): node is ElementNode;
 
 export interface BaseSelection {
-  clone(): BaseSelection;
   dirty: boolean;
+  clone(): BaseSelection;
   extract(): Array<LexicalNode>;
   getNodes(): Array<LexicalNode>;
+  getStartEndPoints(): null | [PointType, PointType];
   getTextContent(): string;
   insertRawText(text: string): void;
   is(selection: null | BaseSelection): boolean;
+  isBackward(): boolean;
+  isCollapsed(): boolean;
   insertText(text: string): void;
   insertNodes(nodes: Array<LexicalNode>): void;
   getCachedNodes(): null | Array<LexicalNode>;
@@ -469,6 +473,8 @@ declare export class NodeSelection implements BaseSelection {
   dirty: boolean;
   constructor(objects: Set<NodeKey>): void;
   is(selection: null | BaseSelection): boolean;
+  isBackward(): boolean;
+  isCollapsed(): boolean;
   add(key: NodeKey): void;
   delete(key: NodeKey): void;
   clear(): void;
@@ -478,6 +484,7 @@ declare export class NodeSelection implements BaseSelection {
   insertRawText(): void;
   insertText(): void;
   getNodes(): Array<LexicalNode>;
+  getStartEndPoints(): null;
   getTextContent(): string;
   insertNodes(nodes: Array<LexicalNode>): void;
   getCachedNodes(): null | Array<LexicalNode>;
@@ -493,6 +500,7 @@ declare export class RangeSelection implements BaseSelection {
   focus: PointType;
   dirty: boolean;
   format: number;
+  style: string;
   constructor(anchor: PointType, focus: PointType, format: number): void;
   is(selection: null | BaseSelection): boolean;
   isBackward(): boolean;
@@ -530,6 +538,8 @@ declare export class RangeSelection implements BaseSelection {
   insertNodes(nodes: Array<LexicalNode>): void;
   getCachedNodes(): null | Array<LexicalNode>;
   setCachedNodes(nodes: null | Array<LexicalNode>): void;
+  forwardDeletion(anchor: PointType, anchorNode: ElementNode | TextNode, isBackward: boolean): boolean;
+  getStartEndPoints(): null | [PointType, PointType];
 }
 export type TextPoint = TextPointType;
 type TextPointType = {