Gowhich

var fs = require("fs");

import fs = require("fs");

var someLib = require('someLib');

define(..., ['someLib'], function(someLib) {

});

import moment = require("moment");
console.log(moment.format());

console.log(moment.format());

(function (root, factory) {
    if (typeof define === "function" && define.amd) {
        define(["libName"], factory);
    } else if (typeof module === "object" && module.exports) {
        module.exports = factory(require("libName"));
    } else {
        root.returnExports = factory(root.libName);
    }
}(this, function (b) {

var x = require("foo");
// Note: calling 'x' as a function
var y = x(42);

var x = require("bar");
// Note: using 'new' operator on the imported variable
var y = new x("hello");

function createGreeting(s) {
    return "Hello, " + s;
}

window.createGreeting = function(s) {
    return "Hello, " + s;
}

/**
 * @constructor
 * @param {number} data
 */
function C(data) {
  this.size = 0;
  this.initialize(data); // Should error, initializer expects a string
}
/**
 * @param {string} s
 */
C.prototype.initialize = function (s) {
  this.size = s.length
}

var c = new C(0);
var result = C(1); // C should only be called with new

/**
 * @this {HTMLElement}
 * @param {*} e
 */
function callbackForLater(e) {
    this.clientHeight = parseInt(e) // should be fine!
}

/**
 * @template T
 * @extends {Set<T>}
 */
class SortableSet extends Set {
  // ...
}

/** @enum {number} */
const JSDocState = {
  BeginningOfLine: 0,
  SawAsterisk: 1,
  SavingComments: 2,
}

/** @enum {function(number): number} */
const Math = {
  add1: n => n + 1,
  id: n => -n,
  sub1: n => n - 1,
}

var someObj = {
  /**
   * @param {string} param1 - Docs on property assignments work
   */
  x: function(param1){}
};

/**
 * As do docs on variable assignments
 * @return {Window}
 */
let someFunc = function(){};

/**
 * And class methods
 * @param {string} greeting The greeting to use
 */
Foo.prototype.sayHi = (greeting) => console.log("Hi!");

/**
 * And arrow functions expressions
 * @param {number} x - A multiplier
 */
let myArrow = x => x * x;

/**
 * Which means it works for stateless function components in JSX too
 * @param {{a: string, b: number}} test - Some param
 */
var sfc = (test) => <div>{test.a.charAt(0)}</div>;

/**
 * A parameter can be a class constructor, using Closure syntax.
 *
 * @param {{new(...args: any[]): object}} C - The class to register
 */
function registerClass(C) {}

/**
 * @param {...string} p1 - A 'rest' arg (array) of strings. (treated as 'any')
 */
function fn10(p1){}

/**
 * @param {...string} p1 - A 'rest' arg (array) of strings. (treated as 'any')
 */
function fn9(p1) {
  return p1.join();
}

function aNormalFunction() {

}
/**
 * @type {aNormalFunction}
 */
var wrong;
/**
 * Use 'typeof' instead:
 * @type {typeof aNormalFunction}
 */
var right;

/**
 * @type {{ a: string, b: number= }}
 */
var wrong;
/**
 * Use postfix question on the property name instead:
 * @type {{ a: string, b?: number }}
 */
var right;

/**
 * @type {?number}
 * With strictNullChecks: true -- number | null
 * With strictNullChecks: off  -- number
 */
var nullable;

/**
 * @type {!number}
 * Just has type number
 */
var normal;

// Parameters may be declared in a variety of syntactic forms
/**
 * @param {string}  p1 - A string param.
 * @param {string=} p2 - An optional param (Closure syntax)
 * @param {string} [p3] - Another optional param (JSDoc syntax).
 * @param {string} [p4="test"] - An optional param with a default value
 * @return {string} This is the result
 */
function stringsStringStrings(p1, p2, p3, p4){
  // TODO
}

/**
 * @return {PromiseLike<string>}
 */
function ps(){}

/**
 * @returns {{ a: string, b: number }} - May use '@returns' as well as '@return'
 */
function ab(){}

/**
 * @typedef {Object} SpecialType - creates a new type named 'SpecialType'
 * @property {string} prop1 - a string property of SpecialType
 * @property {number} prop2 - a number property of SpecialType
 * @property {number=} prop3 - an optional number property of SpecialType
 * @prop {number} [prop4] - an optional number property of SpecialType
 * @prop {number} [prop5=42] - an optional number property of SpecialType with default
 */
/** @type {SpecialType} */
var specialTypeObject;

/**
 * @typedef {object} SpecialType1 - creates a new type named 'SpecialType'
 * @property {string} prop1 - a string property of SpecialType
 * @property {number} prop2 - a number property of SpecialType
 * @property {number=} prop3 - an optional number property of SpecialType
 */
/** @type {SpecialType1} */
var specialTypeObject1;

/**
 * @param {Object} options - The shape is the same as SpecialType above
 * @param {string} options.prop1
 * @param {number} options.prop2
 * @param {number=} options.prop3
 * @param {number} [options.prop4]
 * @param {number} [options.prop5=42]
 */
function special(options) {
  return (options.prop4 || 1001) + options.prop5;
}

/**
 * @callback Predicate
 * @param {string} data
 * @param {number} [index]
 * @returns {boolean}
 */
/** @type {Predicate} */
const ok = s => !(s.length % 2);

/** @typedef {{ prop1: string, prop2: string, prop3?: number }} SpecialType */
/** @typedef {(data: string, index?: number) => boolean} Predicate */

/**
 * @template T
 * @param {T} p1 - A generic parameter that flows through to the return type
 * @return {T}
 */
function id(x){ return x }

/**
 * @template T,U,V
 * @template W,X
 */

/**
 * @template {string} K - K must be a string or string literal
 * @template {{ serious(): string }} Seriousalizable - must have a serious method
 * @param {K} key
 * @param {Seriousalizable} object
 */
function seriousalize(key, object) {
  // ????
}

/**
 * @type {string}
 */
var s;

/** @type {Window} */
var win;

/** @type {PromiseLike<string>} */
var promisedString;

// You can specify an HTML Element with DOM properties
/** @type {HTMLElement} */
var myElement = document.querySelector(selector);
element.dataset.myData = '';

/**
 * @type {(string | boolean)}
 */
var sb;

/**
 * @type {string | boolean}
 */
var sb;

/** @type {number[]} */
var ns;
/** @type {Array.<number>} */
var nds;
/** @type {Array<number>} */
var nas;

/** @type {{ a: string, b: number }} */
var var9;

/**
 * A map-like object that maps arbitrary `string` properties to `number`s.
 *
 * @type {Object.<string, number>}
 */
var stringToNumber;

/** @type {Object.<number, object>} */
var arrayLike;

/** @type {function(string, boolean): number} Closure syntax */
var sbn;
/** @type {(s: string, b: boolean) => number} Typescript syntax */
var sbn2;

/** @type {Function} */
var fn7;
/** @type {function} */
var fn6;

/**
 * @type {*} - can be 'any' type
 */
var star;
/**
 * @type {?} - unknown type (same as 'any')
 */
var question;

/**
 * @type {number | string}
 */
var numberOrString = Math.random() < 0.5 ? "hello" : 100;
var typeAssertedNumber = /** @type {number} */ (numberOrString)

/**
 * @param p { import("./a").Pet }
 */
function walk(p) {
    console.log(`Walking ${p.name}...`);
}

/**
 * @typedef Pet { import("./a").Pet }
 */

/**
 * @type {Pet}
 */
var myPet;
myPet.name;

/**
 * @type {typeof import("./a").x }
 */
var x = require("./a").x;

var obj = { a: 1 };
obj.b = 2;  // Allowed

/** @type {{a: number}} */
var obj = { a: 1 };
obj.b = 2;  // Error, type {a: number} does not have property b

function Foo(i = null) {
    if (!i) i = 1;
    var j = undefined;
    j = 2;
    this.l = [];
}
var foo = new Foo();
foo.l.push(foo.i);
foo.l.push("end");

function bar(a, b) {
    console.log(a + " " + b);
}

bar(1);       // OK, second argument considered optional
bar(1, 2);
bar(1, 2, 3); // Error, too many arguments

/**
 * @param {string} [somebody] - Somebody's name.
 */
function sayHello(somebody) {
    if (!somebody) {
        somebody = 'John Doe';
    }
    console.log('Hello ' + somebody);
}

sayHello();

/** @param {...number} args */
function sum(/* numbers */) {
    var total = 0
    for (var i = 0; i < arguments.length; i++) {
      total += arguments[i]
    }
    return total
}

import { Component } from "react";

class MyComponent extends Component {
    render() {
        this.props.b; // Allowed, since this.props is of type any
    }
}

import { Component } from "react";

/**
 * @augments {Component<{a: number}, State>}
 */
class MyComponent extends Component {
    render() {
        this.props.b; // Error: b does not exist on {a:number}
    }
}

/** @type{Array} */
var x = [];

x.push(1);        // OK
x.push("string"); // OK, x is of type Array<any>

/** @type{Array.<number>} */
var y = [];

y.push(1);        // OK
y.push("string"); // Error, string is not assignable to number

var p = new Promise((resolve, reject) => { reject() });

p; // Promise<any>;

// Disposable Mixin
class Disposable {
    isDisposed: boolean;
    dispose() {
        this.isDisposed = true;
    }

}

// Activatable Mixin
class Activatable {
    isActive: boolean;
    activate() {
        this.isActive = true;
    }
    deactivate() {
        this.isActive = false;
    }
}

class SmartObject implements Disposable, Activatable {
    constructor() {
        setInterval(() => console.log(this.isActive + " : " + this.isDisposed), 500);
    }

    interact() {
        this.activate();
    }

    // Disposable
    isDisposed: boolean = false;
    dispose: () => void;
    // Activatable
    isActive: boolean = false;
    activate: () => void;
    deactivate: () => void;
}
applyMixins(SmartObject, [Disposable, Activatable]);

let smartObj = new SmartObject();
setTimeout(() => smartObj.interact(), 1000);

////////////////////////////////////////
// In your runtime library somewhere
////////////////////////////////////////

function applyMixins(derivedCtor: any, baseCtors: any[]) {
    baseCtors.forEach(baseCtor => {
        Object.getOwnPropertyNames(baseCtor.prototype).forEach(name => {
            derivedCtor.prototype[name] = baseCtor.prototype[name];
        });
    });
}

class SmartObject implements Disposable, Activatable {

// Disposable
isDisposed: boolean = false;
dispose: () => void;
// Activatable
isActive: boolean = false;
activate: () => void;
deactivate: () => void;

applyMixins(SmartObject, [Disposable, Activatable]);

function applyMixins(derivedCtor: any, baseCtors: any[]) {
    baseCtors.forEach(baseCtor => {
        Object.getOwnPropertyNames(baseCtor.prototype).forEach(name => {
            derivedCtor.prototype[name] = baseCtor.prototype[name];
        });
    });
}

class Point {
    private _x: number;
    private _y: number;
    constructor(x: number, y: number) {
        this._x = x;
        this._y = y;
    }

    @configurable(false)
    get x() { return this._x; }

    @configurable(false)
    get y() { return this._y; }
}

function configurable(value: boolean) {
    return function (target: any, propertyKey: string, descriptor: PropertyDescriptor) {
        descriptor.configurable = value;
    };
}

class Greeter {
    @format("Hello, %s")
    greeting: string;

    constructor(message: string) {
        this.greeting = message;
    }
    greet() {
        let formatString = getFormat(this, "greeting");
        return formatString.replace("%s", this.greeting);
    }
}

class Greeter {
    greeting: string;

    constructor(message: string) {
        this.greeting = message;
    }

    @validate
    greet(@required name: string) {
        return "Hello " + name + ", " + this.greeting;
    }
}

import "reflect-metadata";

const requiredMetadataKey = Symbol("required");

function required(target: Object, propertyKey: string | symbol, parameterIndex: number) {
    let existingRequiredParameters: number[] = Reflect.getOwnMetadata(requiredMetadataKey, target, propertyKey) || [];
    existingRequiredParameters.push(parameterIndex);
    Reflect.defineMetadata(requiredMetadataKey, existingRequiredParameters, target, propertyKey);
}

function validate(target: any, propertyName: string, descriptor: TypedPropertyDescriptor<Function>) {
    let method = descriptor.value;
    descriptor.value = function () {
        let requiredParameters: number[] = Reflect.getOwnMetadata(requiredMetadataKey, target, propertyName);
        if (requiredParameters) {
            for (let parameterIndex of requiredParameters) {
                if (parameterIndex >= arguments.length || arguments[parameterIndex] === undefined) {
                    throw new Error("Missing required argument.");
                }
            }
        }

        return method.apply(this, arguments);
    }
}

import "reflect-metadata";

class Point {
    x: number;
    y: number;
}

class Line {
    private _p0: Point;
    private _p1: Point;

    @validate
    set p0(value: Point) { this._p0 = value; }
    get p0() { return this._p0; }

    @validate
    set p1(value: Point) { this._p1 = value; }
    get p1() { return this._p1; }
}

function validate<T>(target: any, propertyKey: string, descriptor: TypedPropertyDescriptor<T>) {
    let set = descriptor.set;
    descriptor.set = function (value: T) {
        let type = Reflect.getMetadata("design:type", target, propertyKey);
        if (!(value instanceof type)) {
            throw new TypeError("Invalid type.");
        }
        set(value);
    }
}

class Line {
    private _p0: Point;
    private _p1: Point;

    @validate
    @Reflect.metadata("design:type", Point)
    set p0(value: Point) { this._p0 = value; }
    get p0() { return this._p0; }

    @validate
    @Reflect.metadata("design:type", Point)
    set p1(value: Point) { this._p1 = value; }
    get p1() { return this._p1; }
}