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// Parts copied from:
// https://github.com/rstacruz/cheatsheets/blob/cb4e03077f3753d5c23b6b2ac142dcf68ff20f9c/typescript.md
// License: MIT.
//
// Parts copied from:
// https://github.com/rmolinamir/typescript-cheatsheet/blob/865f16a68402b8473bb50e3b6587e17eb2a59e92/README.md
// License: ISC.
let isDone1: boolean
let isDone2: boolean = false
function add (a: number, b: number): number {
return a + b
}
function identity <T> (x: T): T {
return x
}
const g = 9.82
const div = <T extends number>(x: T): number => x/2/g;
let input
let len1: number = (input as string).length
let len2: number = (<string> input).length /* not allowed in JSX */
export interface User extends Object {
name: string,
readonly age?: number
[key: number]: Object[]
}
type Name = string | string[] & { smoosh: () => Array<any> }
function getUser(callback: (user?: User) => any) { callback() }
abstract class Greeter<T> implements User {
public name: string
[key: number]: Object[]
static instances = 0
protected greeting: T
constructor(
public x: number,
public y: number, message: T
) {
this.greeting = message
}
private someUselessValue!: number;
public printName = () => {
console.log(this.name);
}
}
const address: [string, number] = ["Street", 99];
enum Color {
Gray, // 0
Red, // 1
Green = 100, // 100
Blue, // 101
Yellow = 2 // 2
}
enum Options {
FIRST,
EXPLICIT = 1,
BOOLEAN = Options.FIRST | Options.EXPLICIT
}
// @ts-ignore
declare module "path" {
export function normalize(p: string): string;
export function join(...paths: any[]): string;
export var sep: string;
}
// Added a space in `K>>` as a workaround to this edge case:
// js-tokens: `K`, `>>`
// should be: `K`, `>`, `>`
type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K> >
type Fish = {swim: Function}
type Bird = Object
function isFish(pet: Fish | Bird): pet is Fish {
return (<Fish>pet).swim !== undefined;
}
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