Revert "Remove Flow annotations and pragmas"

This reverts commit 4252244d06b225ab26a02d52c04f9940a3e4d6a2.

src/options.js

@@ -1,8 +1,15 @@
+/* @flow */
 // A second optional argument can be given to further configure
 // the parser process. These options are recognized:
 
-
-export const defaultOptions = {
+export const defaultOptions: {
+  sourceType: string,
+  allowReturnOutsideFunction: boolean,
+  allowImportExportEverywhere: boolean,
+  allowSuperOutsideMethod: boolean,
+  plugins: Array<string>,
+  strictMode: any
+} = {
   // Source type ("script" or "module") for different semantics
   sourceType: "script",
   // When enabled, a return at the top level is not considered an
@@ -21,7 +28,7 @@ export const defaultOptions = {
 
 // Interpret and default an options object
 
-export function getOptions(opts) {
+export function getOptions(opts?: Object): Object {
   let options = {};
   for (let key in defaultOptions) {
     options[key] = opts && key in opts ? opts[key] : defaultOptions[key];

src/parser/comments.js

@@ -1,3 +1,4 @@
+/* @flow */
 /* eslint max-len: 0 */
 
 /**
@@ -118,7 +119,7 @@ pp.processComment = function (node) {
       // result in an empty array, and if so, the array must be
       // deleted.
       node.leadingComments = this.state.leadingComments.slice(0, i);
-      if (node.leadingComments.length === 0) {
+      if ((node.leadingComments: Array<any>).length === 0) {
         node.leadingComments = null;
       }
 

src/parser/index.js

@@ -1,3 +1,4 @@
+/* @flow */
 
 import { reservedWords } from "../util/identifier";
 import { getOptions } from "../options";
@@ -6,7 +7,7 @@ import Tokenizer from "../tokenizer";
 export const plugins = {};
 
 export default class Parser extends Tokenizer {
-  constructor(options, input) {
+  constructor(options: Object, input: string) {
     options = getOptions(options);
     super(options, input);
 
@@ -22,15 +23,15 @@ export default class Parser extends Tokenizer {
     }
   }
 
-  hasPlugin(name) {
+  hasPlugin(name: string): boolean {
     return !!(this.plugins["*"] || this.plugins[name]);
   }
 
-  extend(name, f) {
+  extend(name: string, f: Function) {
     this[name] = f(this[name]);
   }
 
-  loadPlugins(plugins) {
+  loadPlugins(plugins: Array<string>): Object {
     let pluginMap = {};
 
     if (plugins.indexOf("flow") >= 0) {
@@ -51,7 +52,13 @@ export default class Parser extends Tokenizer {
     return pluginMap;
   }
 
-  parse() {
+  parse(): {
+    type: "File",
+    program: {
+      type: "Program",
+      body: Array<Object>
+    }
+  } {
     let file = this.startNode();
     let program = this.startNode();
     this.nextToken();

src/parser/util.js

@@ -1,3 +1,4 @@
+/* @flow */
 
 import { types as tt } from "../tokenizer/types";
 import Parser from "./index";

src/tokenizer/context.js

@@ -1,3 +1,4 @@
+/* @flow */
 
 // The algorithm used to determine whether a regexp can appear at a
 // given point in the program is loosely based on sweet.js' approach.
@@ -7,16 +8,27 @@ import { types as tt } from "./types";
 import { lineBreak } from "../util/whitespace";
 
 export class TokContext {
-  constructor(token, isExpr, preserveSpace, override) {
+  constructor(
+    token: string,
+    isExpr?: boolean,
+    preserveSpace?: boolean,
+    override?: Function,
+  ) {
     this.token = token;
     this.isExpr = !!isExpr;
     this.preserveSpace = !!preserveSpace;
     this.override = override;
   }
 
+  token: string;
+  isExpr: boolean;
+  preserveSpace: boolean;
+  override: ?Function;
 }
 
-export const types = {
+export const types: {
+  [key: string]: TokContext;
+} = {
   b_stat: new TokContext("{", false),
   b_expr: new TokContext("{", true),
   b_tmpl: new TokContext("${", true),

src/tokenizer/index.js

@@ -1,6 +1,7 @@
 /* eslint max-len: 0 */
 /* eslint indent: 0 */
 
+import type { TokenType } from "./types";
 import { isIdentifierStart, isIdentifierChar, isKeyword } from "../util/identifier";
 import { types as tt, keywords as keywordTypes } from "./types";
 import { types as ct } from "./context";
@@ -21,6 +22,11 @@ export class Token {
     this.loc = new SourceLocation(state.startLoc, state.endLoc);
   }
 
+  type: TokenType;
+  value: any;
+  start: number;
+  end: number;
+  loc: SourceLocation;
 }
 
 // ## Tokenizer

src/util/whitespace.js

@@ -1,3 +1,4 @@
+/* @flow */
 
 // Matches a whole line break (where CRLF is considered a single
 // line break). Used to count lines.
@@ -5,7 +6,7 @@
 export const lineBreak = /\r\n?|\n|\u2028|\u2029/;
 export const lineBreakG = new RegExp(lineBreak.source, "g");
 
-export function isNewLine(code) {
+export function isNewLine(code: number): boolean {
   return code === 10 || code === 13 || code === 0x2028 || code === 0x2029;
 }