51 lines
1.4 KiB
TypeScript
51 lines
1.4 KiB
TypeScript
// @noImplicitAny: true
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// @noImplicitThis: true
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interface I {
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n: number;
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explicitThis(this: this, m: number): number;
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}
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interface Unused {
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implicitNoThis(m: number): number;
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}
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class C implements I {
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n: number;
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explicitThis(this: this, m: number): number {
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return this.n + m;
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}
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implicitThis(m: number): number {
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return this.n + m;
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}
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explicitVoid(this: void, m: number): number {
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return m + 1;
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}
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}
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let c = new C();
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c.explicitVoid = c.explicitThis; // error, 'void' is missing everything
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let o = {
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n: 101,
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explicitThis: function (m: number) {
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return m + this.n.length; // error, 'length' does not exist on 'number'
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},
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implicitThis(m: number): number { return m; }
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};
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let i: I = o;
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let o2: I = {
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n: 1001,
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explicitThis: function (m) {
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return m + this.n.length; // error, this.n: number, no member 'length'
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},
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}
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let x = i.explicitThis;
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let n = x(12); // callee:void doesn't match this:I
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let u: Unused;
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let y = u.implicitNoThis;
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n = y(12); // ok, callee:void matches this:any
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c.explicitVoid = c.implicitThis // ok, implicitThis(this:any)
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o.implicitThis = c.implicitThis; // ok, implicitThis(this:any)
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o.implicitThis = c.explicitThis; // ok, implicitThis(this:any) is assignable to explicitThis(this: this)
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o.implicitThis = i.explicitThis;
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i.explicitThis = function(m) {
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return this.n.length; // error, this.n: number
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}
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