add declare to class properties type annotations (#12257)

* add declare to class properties type annotations

* chore: use preset-flow

packages/babel-parser/src/parser/base.js

@@ -10,23 +10,23 @@ import type ProductionParameterHandler from "../util/production-parameter";
 
 export default class BaseParser {
   // Properties set by constructor in index.js
-  options: Options;
-  inModule: boolean;
-  scope: ScopeHandler<*>;
-  classScope: ClassScopeHandler;
-  prodParam: ProductionParameterHandler;
-  expressionScope: ExpressionScopeHandler;
-  plugins: PluginsMap;
-  filename: ?string;
+  declare options: Options;
+  declare inModule: boolean;
+  declare scope: ScopeHandler<*>;
+  declare classScope: ClassScopeHandler;
+  declare prodParam: ProductionParameterHandler;
+  declare expressionScope: ExpressionScopeHandler;
+  declare plugins: PluginsMap;
+  declare filename: ?string;
   sawUnambiguousESM: boolean = false;
   ambiguousScriptDifferentAst: boolean = false;
 
   // Initialized by Tokenizer
-  state: State;
+  declare state: State;
   // input and length are not in state as they are constant and we do
   // not want to ever copy them, which happens if state gets cloned
-  input: string;
-  length: number;
+  declare input: string;
+  declare length: number;
 
   hasPlugin(name: string): boolean {
     return this.plugins.has(name);

packages/babel-parser/src/tokenizer/index.js

@@ -101,11 +101,11 @@ export class Token {
     this.loc = new SourceLocation(state.startLoc, state.endLoc);
   }
 
-  type: TokenType;
-  value: any;
-  start: number;
-  end: number;
-  loc: SourceLocation;
+  declare type: TokenType;
+  declare value: any;
+  declare start: number;
+  declare end: number;
+  declare loc: SourceLocation;
 }
 
 // ## Tokenizer

packages/babel-parser/src/util/class-scope.js

@@ -23,7 +23,7 @@ type raiseFunction = (number, string, ...any) => void;
 
 export default class ClassScopeHandler {
   stack: Array<ClassScope> = [];
-  raise: raiseFunction;
+  declare raise: raiseFunction;
   undefinedPrivateNames: Map<string, number> = new Map();
 
   constructor(raise: raiseFunction) {

packages/babel-parser/src/util/scope.js

@@ -39,8 +39,8 @@ type raiseFunction = (number, string, ...any) => void;
 // current scope in order to detect duplicate variable names.
 export default class ScopeHandler<IScope: Scope = Scope> {
   scopeStack: Array<IScope> = [];
-  raise: raiseFunction;
-  inModule: boolean;
+  declare raise: raiseFunction;
+  declare inModule: boolean;
   undefinedExports: Map<string, number> = new Map();
   undefinedPrivateNames: Map<string, number> = new Map();