Revert "Remove flow"

This reverts commit 2827ff6.

packages/babel-cli/src/babel-doctor/index.js

@@ -36,7 +36,7 @@ while (nodeModulesDirectories.length) {
   let loc = nodeModulesDirectories.shift();
   if (!fs.existsSync(loc)) continue;
 
-  let packagesNames = fs.readdirSync(loc);
+  let packagesNames: Array<string> = fs.readdirSync(loc);
 
   for (let packageName of packagesNames) {
     if (packageName[0] === ".") continue;

packages/babel-core/src/api/browser.js

@@ -4,11 +4,11 @@
 import { transform } from "./node";
 export * from "./node";
 
-export function run(code, opts = {}) {
+export function run(code: string, opts: Object = {}): any {
   return new Function(transform(code, opts).code)();
 }
 
-export function load(url, callback, opts = {}, hold) {
+export function load(url: string, callback: Function, opts: Object = {}, hold?: boolean) {
   opts.filename = opts.filename || url;
 
   let xhr = global.ActiveXObject ? new global.ActiveXObject("Microsoft.XMLHTTP") : new global.XMLHttpRequest();
@@ -32,7 +32,7 @@ export function load(url, callback, opts = {}, hold) {
 }
 
 function runScripts() {
-  let scripts = [];
+  let scripts: Array<Array<any> | Object> = [];
   let types   = ["text/ecmascript-6", "text/6to5", "text/babel", "module"];
   let index   = 0;
 
@@ -53,7 +53,7 @@ function runScripts() {
    * Load, transform, and execute all scripts.
    */
 
-  function run(script, i) {
+  function run(script: Object, i: number) {
     let opts = {};
 
     if (script.src) {

packages/babel-core/src/api/node.js

@@ -42,7 +42,7 @@ export let transformFromAst = pipeline.transformFromAst.bind(pipeline);
 
 //
 
-export function transformFile(filename, opts, callback) {
+export function transformFile(filename: string, opts?: Object, callback: Function) {
   if (isFunction(opts)) {
     callback = opts;
     opts = {};
@@ -69,7 +69,7 @@ export function transformFile(filename, opts, callback) {
   });
 }
 
-export function transformFileSync(filename, opts = {}) {
+export function transformFileSync(filename: string, opts?: Object = {}): string {
   opts.filename = filename;
   return transform(fs.readFileSync(filename, "utf8"), opts);
 }

packages/babel-core/src/helpers/resolve.js

@@ -3,7 +3,7 @@ import path from "path";
 
 let relativeModules = {};
 
-export default function (loc, relative = process.cwd()) {
+export default function (loc: string, relative: string = process.cwd()): ?string {
   // we're in the browser, probably
   if (typeof Module === "object") return null;
 

packages/babel-core/src/store.js

@@ -4,11 +4,13 @@ export default class Store extends Map {
     this.dynamicData = {};
   }
 
+  dynamicData: Object;
+
   setDynamic(key, fn) {
     this.dynamicData[key] = fn;
   }
 
-  get(key) {
+  get(key: string): any {
     if (this.has(key)) {
       return super.get(key);
     } else {

packages/babel-core/src/tools/build-external-helpers.js

@@ -82,7 +82,10 @@ function buildHelpers(body, namespace, whitelist) {
     ));
   });
 }
-export default function (whitelist, outputType = "global") {
+export default function (
+  whitelist?: Array<string>,
+  outputType: "global" | "umd" | "var" = "global",
+) {
   let namespace = t.identifier("babelHelpers");
 
   let builder = function (body) {

packages/babel-core/src/transformation/file/logger.js

@@ -1,3 +1,4 @@
+import type File from "./index";
 import buildDebug from "debug/node";
 
 let verboseDebug = buildDebug("babel:verbose");
@@ -6,26 +7,29 @@ let generalDebug = buildDebug("babel");
 let seenDeprecatedMessages = [];
 
 export default class Logger {
-  constructor(file, filename) {
+  constructor(file: File, filename: string) {
     this.filename = filename;
     this.file     = file;
   }
 
-  _buildMessage(msg) {
+  filename: string;
+  file: File;
+
+  _buildMessage(msg: string): string {
     let parts = `[BABEL] ${this.filename}`;
     if (msg) parts += `: ${msg}`;
     return parts;
   }
 
-  warn(msg) {
+  warn(msg: string) {
     console.warn(this._buildMessage(msg));
   }
 
-  error(msg, Constructor = Error) {
+  error(msg: string, Constructor: typeof Error = Error): Error {
     throw new Constructor(this._buildMessage(msg));
   }
 
-  deprecate(msg) {
+  deprecate(msg: string) {
     if (this.file.opts && this.file.opts.suppressDeprecationMessages) return;
 
     msg = this._buildMessage(msg);
@@ -39,15 +43,15 @@ export default class Logger {
     console.error(msg);
   }
 
-  verbose(msg) {
+  verbose(msg: string) {
     if (verboseDebug.enabled) verboseDebug(this._buildMessage(msg));
   }
 
-  debug(msg) {
+  debug(msg: string) {
     if (generalDebug.enabled) generalDebug(this._buildMessage(msg));
   }
 
-  deopt(node, msg) {
+  deopt(node: Object, msg: string) {
     this.debug(msg);
   }
 }

packages/babel-core/src/transformation/file/metadata.js

@@ -21,7 +21,7 @@ export let ImportDeclaration = {
       specifiers
     });
 
-    for (let specifier of path.get("specifiers")) {
+    for (let specifier of (path.get("specifiers"): Array<Object>)) {
       let local = specifier.node.local.name;
 
       if (specifier.isImportDefaultSpecifier()) {
@@ -77,7 +77,7 @@ export function ExportDeclaration(path, file) {
   }
 
   if (path.isExportNamedDeclaration() && node.specifiers) {
-    for (let specifier of node.specifiers) {
+    for (let specifier of (node.specifiers: Array<Object>)) {
       let exported = specifier.exported.name;
       exports.exported.push(exported);
 

packages/babel-core/src/transformation/file/options/option-manager.js

@@ -1,6 +1,7 @@
 /* eslint max-len: 0 */
 
 import * as context from "../../../api/node";
+import type Logger from "../logger";
 import Plugin from "../../plugin";
 import * as messages from "babel-messages";
 import { normaliseOptions } from "./index";
@@ -32,19 +33,49 @@ function exists(filename) {
   }
 }
 
+type PluginObject = {
+  pre?: Function;
+  post?: Function;
+  manipulateOptions?: Function;
+
+  visitor: ?{
+    [key: string]: Function | {
+      enter?: Function | Array<Function>;
+      exit?: Function | Array<Function>;
+    }
+  };
+};
+
+type MergeOptions = {
+  options?: Object,
+  extending?: Object,
+  alias: string,
+  loc?: string,
+  dirname?: string
+};
+
 export default class OptionManager {
-  constructor(log) {
+  constructor(log?: Logger) {
     this.resolvedConfigs = [];
     this.options = OptionManager.createBareOptions();
     this.log = log;
   }
 
+  resolvedConfigs: Array<string>;
+  options: Object;
+  log: ?Logger;
+
+  static memoisedPlugins: Array<{
+    container: Function;
+    plugin: Plugin;
+  }>;
+
   static memoisePluginContainer(fn, loc, i, alias) {
-    for (let cache of OptionManager.memoisedPlugins) {
+    for (let cache of (OptionManager.memoisedPlugins: Array<Object>)) {
       if (cache.container === fn) return cache.plugin;
     }
 
-    let obj;
+    let obj: ?PluginObject;
 
     if (typeof fn === "function") {
       obj = fn(context);
@@ -125,7 +156,7 @@ export default class OptionManager {
     });
   }
 
-  addConfig(loc, key, json = json5) {
+  addConfig(loc: string, key?: string, json = json5): boolean {
     if (this.resolvedConfigs.indexOf(loc) >= 0) {
       return false;
     }
@@ -167,7 +198,7 @@ export default class OptionManager {
     alias,
     loc,
     dirname
-  }) {
+  }: MergeOptions) {
     alias = alias || "foreign";
     if (!rawOpts) return;
 
@@ -272,7 +303,7 @@ export default class OptionManager {
    * Merges all presets into the main options in case we are not in the
    * "pass per preset" mode. Otherwise, options are calculated per preset.
    */
-  mergePresets(presets, dirname) {
+  mergePresets(presets: Array<string | Object>, dirname: string) {
     this.resolvePresets(presets, dirname, (presetOpts, presetLoc) => {
       this.mergeOptions({
         options: presetOpts,
@@ -287,7 +318,7 @@ export default class OptionManager {
    * Resolves presets options which can be either direct object data,
    * or a module name to require.
    */
-  resolvePresets(presets, dirname, onResolve) {
+  resolvePresets(presets: Array<string | Object>, dirname: string, onResolve?) {
     return presets.map((val) => {
       if (typeof val === "string") {
         let presetLoc = resolve(`babel-preset-${val}`, dirname) || resolve(val, dirname);
@@ -376,7 +407,7 @@ export default class OptionManager {
     }
   }
 
-  init(opts = {}) {
+  init(opts: Object = {}): Object {
     let filename = opts.filename;
 
     // resolve all .babelrc files

packages/babel-core/src/transformation/plugin-pass.js

@@ -1,14 +1,20 @@
+import type Plugin from "./plugin";
 import Store from "../store";
 import traverse from "babel-traverse";
+import File from "./file";
 
 export default class PluginPass extends Store {
-  constructor(file, plugin, options = {}) {
+  constructor(file: File, plugin: Plugin, options: Object = {}) {
     super();
     this.plugin = plugin;
     this.file   = file;
     this.opts   = options;
   }
 
+  plugin: Plugin;
+  file: File;
+  opts: Object;
+
   transform() {
     let file = this.file;
     file.log.debug(`Start transformer ${this.key}`);

packages/babel-generator/src/index.js

@@ -34,6 +34,33 @@ export class CodeGenerator extends Printer {
     this.map        = new SourceMap(position, opts, code);
   }
 
+  format: {
+    shouldPrintComment: (comment: string) => boolean;
+    retainLines: boolean;
+    comments: boolean;
+    auxiliaryCommentBefore: string;
+    auxiliaryCommentAfter: string;
+    compact: boolean | "auto";
+    minified: boolean;
+    quotes: "single" | "double";
+    concise: boolean;
+    indent: {
+      adjustMultilineComment: boolean;
+      style: string;
+      base: number;
+    }
+  };
+
+  auxiliaryCommentBefore: string;
+  auxiliaryCommentAfter: string;
+  whitespace: Whitespace;
+  position: Position;
+  map: SourceMap;
+  comments: Array<Object>;
+  tokens: Array<Object>;
+  opts: Object;
+  ast: Object;
+
   /**
    * Normalize generator options, setting defaults.
    *
@@ -134,7 +161,7 @@ export class CodeGenerator extends Printer {
   }
 }
 
-export default function (ast, opts, code) {
+export default function (ast: Object, opts: Object, code: string): Object {
   let gen = new CodeGenerator(ast, opts, code);
   return gen.generate();
 }

packages/babel-generator/src/printer.js

@@ -120,7 +120,7 @@ export default class Printer extends Buffer {
     printMethod.call(this, node, parent);
   }
 
-  printJoin(nodes, parent, opts = {}) {
+  printJoin(nodes: ?Array, parent: Object, opts = {}) {
     if (!nodes || !nodes.length) return;
 
     let len = nodes.length;
@@ -310,7 +310,7 @@ export default class Printer extends Buffer {
     this.newline(this.whitespace.getNewlinesAfter(comment));
   }
 
-  printComments(comments) {
+  printComments(comments?: Array<Object>) {
     if (!comments || !comments.length) return;
 
     for (let comment of comments) {

packages/babel-generator/src/whitespace.js

@@ -82,10 +82,10 @@ export default class Whitespace {
    * Find a token between start and end.
    */
 
-  _findToken(test, start, end) {
+  _findToken(test: Function, start: number, end: number): number {
     if (start >= end) return -1;
     const middle = (start + end) >>> 1;
-    const match = test(this.tokens[middle]);
+    const match: number = test(this.tokens[middle]);
     if (match < 0) {
       return this._findToken(test, middle + 1, end);
     } else if (match > 0) {

packages/babel-helper-bindify-decorators/src/index.js

@@ -1,6 +1,7 @@
+import type { NodePath } from "babel-traverse";
 import * as t from "babel-types";
 
-export default function bindifyDecorators(decorators) {
+export default function bindifyDecorators(decorators: Array<NodePath>): Array<NodePath> {
   for (let decoratorPath of decorators) {
     let decorator = decoratorPath.node;
     let expression = decorator.expression;