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//// [thisTypeInObjectLiterals2.ts]
// In methods of an object literal with no contextual type, 'this' has the type
// of the object literal.
let obj1 = {
a: 1,
f() {
return this.a;
},
b: "hello",
c: {
g() {
this.g();
}
},
get d() {
return this.a;
},
get e() {
return this.b;
},
set e(value) {
this.b = value;
}
};
// In methods of an object literal with a contextual type, 'this' has the
// contextual type.
type Point = {
x: number;
y: number;
z?: number;
moveBy(dx: number, dy: number, dz?: number): void;
}
let p1: Point = {
x: 10,
y: 20,
moveBy(dx, dy, dz) {
this.x += dx;
this.y += dy;
if (this.z && dz) {
this.z += dz;
}
}
};
let p2: Point | null = {
x: 10,
y: 20,
moveBy(dx, dy, dz) {
this.x += dx;
this.y += dy;
if (this.z && dz) {
this.z += dz;
}
}
};
let p3: Point | undefined = {
x: 10,
y: 20,
moveBy(dx, dy, dz) {
this.x += dx;
this.y += dy;
if (this.z && dz) {
this.z += dz;
}
}
};
let p4: Point | null | undefined = {
x: 10,
y: 20,
moveBy(dx, dy, dz) {
this.x += dx;
this.y += dy;
if (this.z && dz) {
this.z += dz;
}
}
};
declare function f1(p: Point): void;
f1({
x: 10,
y: 20,
moveBy(dx, dy, dz) {
this.x += dx;
this.y += dy;
if (this.z && dz) {
this.z += dz;
}
}
});
declare function f2(p: Point | null | undefined): void;
f2({
x: 10,
y: 20,
moveBy(dx, dy, dz) {
this.x += dx;
this.y += dy;
if (this.z && dz) {
this.z += dz;
}
}
});
// In methods of an object literal with a contextual type that includes some
// ThisType<T>, 'this' is of type T.
type ObjectDescriptor<D, M> = {
data?: D;
methods?: M & ThisType<D & M>; // Type of 'this' in methods is D & M
}
declare function makeObject<D, M>(desc: ObjectDescriptor<D, M>): D & M;
let x1 = makeObject({
data: { x: 0, y: 0 },
methods: {
moveBy(dx: number, dy: number) {
this.x += dx; // Strongly typed this
this.y += dy; // Strongly typed this
}
}
});
// In methods contained in an object literal with a contextual type that includes
// some ThisType<T>, 'this' is of type T.
type ObjectDescriptor2<D, M> = ThisType<D & M> & {
data?: D;
methods?: M;
}
declare function makeObject2<D, M>(desc: ObjectDescriptor<D, M>): D & M;
let x2 = makeObject2({
data: { x: 0, y: 0 },
methods: {
moveBy(dx: number, dy: number) {
this.x += dx; // Strongly typed this
this.y += dy; // Strongly typed this
}
}
});
// Check pattern similar to Object.defineProperty and Object.defineProperties
type PropDesc<T> = {
value?: T;
get?(): T;
set?(value: T): void;
}
type PropDescMap<T> = {
[K in keyof T]: PropDesc<T[K]>;
}
declare function defineProp<T, K extends string, U>(obj: T, name: K, desc: PropDesc<U> & ThisType<T>): T & Record<K, U>;
declare function defineProps<T, U>(obj: T, descs: PropDescMap<U> & ThisType<T>): T & U;
let p10 = defineProp(p1, "foo", { value: 42 });
p10.foo = p10.foo + 1;
let p11 = defineProp(p1, "bar", {
get() {
return this.x;
},
set(value: number) {
this.x = value;
}
});
p11.bar = p11.bar + 1;
let p12 = defineProps(p1, {
foo: {
value: 42
},
bar: {
get(): number {
return this.x;
},
set(value: number) {
this.x = value;
}
}
});
p12.foo = p12.foo + 1;
p12.bar = p12.bar + 1;
// Proof of concept for typing of Vue.js
type Accessors<T> = { [K in keyof T]: (() => T[K]) | Computed<T[K]> };
type Dictionary<T> = { [x: string]: T }
type Computed<T> = {
get?(): T;
set?(value: T): void;
}
type VueOptions<D, M, P> = ThisType<D & M & P> & {
data?: D | (() => D);
methods?: M;
computed?: Accessors<P>;
}
declare const Vue: new <D, M, P>(options: VueOptions<D, M, P>) => D & M & P;
let vue = new Vue({
data: () => ({ x: 1, y: 2 }),
methods: {
f(x: string) {
return this.x;
}
},
computed: {
test(): number {
return this.x;
},
hello: {
get() {
return "hi";
},
set(value: string) {
}
}
}
});
vue;
vue.x;
vue.f("abc");
vue.test;
vue.hello;
//// [thisTypeInObjectLiterals2.js]
"use strict";
// In methods of an object literal with no contextual type, 'this' has the type
// of the object literal.
var obj1 = {
a: 1,
f: function () {
return this.a;
},
b: "hello",
c: {
g: function () {
this.g();
}
},
get d() {
return this.a;
},
get e() {
return this.b;
},
set e(value) {
this.b = value;
}
};
var p1 = {
x: 10,
y: 20,
moveBy: function (dx, dy, dz) {
this.x += dx;
this.y += dy;
if (this.z && dz) {
this.z += dz;
}
}
};
var p2 = {
x: 10,
y: 20,
moveBy: function (dx, dy, dz) {
this.x += dx;
this.y += dy;
if (this.z && dz) {
this.z += dz;
}
}
};
var p3 = {
x: 10,
y: 20,
moveBy: function (dx, dy, dz) {
this.x += dx;
this.y += dy;
if (this.z && dz) {
this.z += dz;
}
}
};
var p4 = {
x: 10,
y: 20,
moveBy: function (dx, dy, dz) {
this.x += dx;
this.y += dy;
if (this.z && dz) {
this.z += dz;
}
}
};
f1({
x: 10,
y: 20,
moveBy: function (dx, dy, dz) {
this.x += dx;
this.y += dy;
if (this.z && dz) {
this.z += dz;
}
}
});
f2({
x: 10,
y: 20,
moveBy: function (dx, dy, dz) {
this.x += dx;
this.y += dy;
if (this.z && dz) {
this.z += dz;
}
}
});
var x1 = makeObject({
data: { x: 0, y: 0 },
methods: {
moveBy: function (dx, dy) {
this.x += dx; // Strongly typed this
this.y += dy; // Strongly typed this
}
}
});
var x2 = makeObject2({
data: { x: 0, y: 0 },
methods: {
moveBy: function (dx, dy) {
this.x += dx; // Strongly typed this
this.y += dy; // Strongly typed this
}
}
});
var p10 = defineProp(p1, "foo", { value: 42 });
p10.foo = p10.foo + 1;
var p11 = defineProp(p1, "bar", {
get: function () {
return this.x;
},
set: function (value) {
this.x = value;
}
});
p11.bar = p11.bar + 1;
var p12 = defineProps(p1, {
foo: {
value: 42
},
bar: {
get: function () {
return this.x;
},
set: function (value) {
this.x = value;
}
}
});
p12.foo = p12.foo + 1;
p12.bar = p12.bar + 1;
var vue = new Vue({
data: function () { return ({ x: 1, y: 2 }); },
methods: {
f: function (x) {
return this.x;
}
},
computed: {
test: function () {
return this.x;
},
hello: {
get: function () {
return "hi";
},
set: function (value) {
}
}
}
});
vue;
vue.x;
vue.f("abc");
vue.test;
vue.hello;
//// [thisTypeInObjectLiterals2.d.ts]
declare let obj1: {
a: number;
f(): number;
b: string;
c: {
g(): void;
};
readonly d: number;
e: string;
};
declare type Point = {
x: number;
y: number;
z?: number;
moveBy(dx: number, dy: number, dz?: number): void;
};
declare let p1: Point;
declare let p2: Point | null;
declare let p3: Point | undefined;
declare let p4: Point | null | undefined;
declare function f1(p: Point): void;
declare function f2(p: Point | null | undefined): void;
declare type ObjectDescriptor<D, M> = {
data?: D;
methods?: M & ThisType<D & M>;
};
declare function makeObject<D, M>(desc: ObjectDescriptor<D, M>): D & M;
declare let x1: {
x: number;
y: number;
} & {
moveBy(dx: number, dy: number): void;
};
declare type ObjectDescriptor2<D, M> = ThisType<D & M> & {
data?: D;
methods?: M;
};
declare function makeObject2<D, M>(desc: ObjectDescriptor<D, M>): D & M;
declare let x2: {
x: number;
y: number;
} & {
moveBy(dx: number, dy: number): void;
};
declare type PropDesc<T> = {
value?: T;
get?(): T;
set?(value: T): void;
};
declare type PropDescMap<T> = {
[K in keyof T]: PropDesc<T[K]>;
};
declare function defineProp<T, K extends string, U>(obj: T, name: K, desc: PropDesc<U> & ThisType<T>): T & Record<K, U>;
declare function defineProps<T, U>(obj: T, descs: PropDescMap<U> & ThisType<T>): T & U;
declare let p10: Point & Record<"foo", number>;
declare let p11: Point & Record<"bar", number>;
declare let p12: Point & {
foo: number;
bar: number;
};
declare type Accessors<T> = {
[K in keyof T]: (() => T[K]) | Computed<T[K]>;
};
declare type Dictionary<T> = {
[x: string]: T;
};
declare type Computed<T> = {
get?(): T;
set?(value: T): void;
};
declare type VueOptions<D, M, P> = ThisType<D & M & P> & {
data?: D | (() => D);
methods?: M;
computed?: Accessors<P>;
};
declare const Vue: new <D, M, P>(options: VueOptions<D, M, P>) => D & M & P;
declare let vue: {
x: number;
y: number;
} & {
f(x: string): number;
} & {
test: number;
hello: string;
};
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