29ca93ba48
* Classes can extend JS constructor functions Now ES6 classes can extend ES5 constructor functions, although only those written in a JS file. Note that the static side assignability is checked. I need to write tests to make sure that instance side assignability is checked too. I haven't tested generic constructor functions yet either. * Test static+instance assignability errors+generics Note that generics do not work. * Cleanup from PR comments * Even more cleanup * Update case of function name
94 lines
1.8 KiB
TypeScript
94 lines
1.8 KiB
TypeScript
// @noEmit: true
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// @allowJs: true
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// @checkJs: true
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// @Filename: first.js
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/**
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* @constructor
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* @param {number} numberOxen
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*/
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function Wagon(numberOxen) {
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this.numberOxen = numberOxen
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}
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/** @param {Wagon[]=} wagons */
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Wagon.circle = function (wagons) {
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return wagons ? wagons.length : 3.14;
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}
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/** @param {*[]=} supplies - *[]= is my favourite type */
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Wagon.prototype.load = function (supplies) {
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}
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// ok
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class Sql extends Wagon {
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constructor() {
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super(); // error: not enough arguments
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this.foonly = 12
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}
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/**
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* @param {Array.<string>} files
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* @param {"csv" | "json" | "xmlolololol"} format
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* This is not assignable, so should have a type error
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*/
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load(files, format) {
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if (format === "xmlolololol") {
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throw new Error("please do not use XML. It was a joke.");
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}
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}
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}
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var db = new Sql();
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db.numberOxen = db.foonly
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// error, can't extend a TS constructor function
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class Drakkhen extends Dragon {
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}
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// @Filename: second.ts
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/**
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* @constructor
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*/
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function Dragon(numberEaten: number) {
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this.numberEaten = numberEaten
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}
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// error!
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class Firedrake extends Dragon {
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constructor() {
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super();
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}
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}
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// ok
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class Conestoga extends Wagon {
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constructor(public drunkOO: true) {
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// error: wrong type
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super('nope');
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}
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// should error since others is not optional
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static circle(others: (typeof Wagon)[]) {
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return others.length
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}
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}
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var c = new Conestoga(true);
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c.drunkOO
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c.numberOxen
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// @Filename: generic.js
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/**
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* @template T
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* @param {T} flavour
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*/
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function Soup(flavour) {
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this.flavour = flavour
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}
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/** @extends {Soup<{ claim: "ignorant" | "malicious" }>} */
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class Chowder extends Soup {
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log() {
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return this.flavour
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}
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}
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var soup = new Soup(1);
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soup.flavour
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var chowder = new Chowder();
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chowder.flavour.claim
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