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tests/cases/conformance/types/thisType/looseThisTypeInFunctions.ts(21,1): error TS2322: Type '(this: C, m: number) => number' is not assignable to type '(this: void, m: number) => number'.
The 'this' types of each signature are incompatible.
Type 'void' is not assignable to type 'C'.
tests/cases/conformance/types/thisType/looseThisTypeInFunctions.ts(33,28): error TS2339: Property 'length' does not exist on type 'number'.
tests/cases/conformance/types/thisType/looseThisTypeInFunctions.ts(37,9): error TS2684: The 'this' context of type 'void' is not assignable to method's 'this' of type 'I'.
tests/cases/conformance/types/thisType/looseThisTypeInFunctions.ts(46,20): error TS2339: Property 'length' does not exist on type 'number'.
==== tests/cases/conformance/types/thisType/looseThisTypeInFunctions.ts (4 errors) ====
interface I {
n: number;
explicitThis(this: this, m: number): number;
}
interface Unused {
implicitNoThis(m: number): number;
}
class C implements I {
n: number;
explicitThis(this: this, m: number): number {
return this.n + m;
}
implicitThis(m: number): number {
return this.n + m;
}
explicitVoid(this: void, m: number): number {
return m + 1;
}
}
let c = new C();
c.explicitVoid = c.explicitThis; // error, 'void' is missing everything
~~~~~~~~~~~~~~
!!! error TS2322: Type '(this: C, m: number) => number' is not assignable to type '(this: void, m: number) => number'.
!!! error TS2322: The 'this' types of each signature are incompatible.
!!! error TS2322: Type 'void' is not assignable to type 'C'.
let o = {
n: 101,
explicitThis: function (m: number) {
return m + this.n.length; // error, 'length' does not exist on 'number'
},
implicitThis(m: number): number { return m; }
};
let i: I = o;
let o2: I = {
n: 1001,
explicitThis: function (m) {
return m + this.n.length; // error, this.n: number, no member 'length'
~~~~~~
!!! error TS2339: Property 'length' does not exist on type 'number'.
},
}
let x = i.explicitThis;
let n = x(12); // callee:void doesn't match this:I
~~~~~
!!! error TS2684: The 'this' context of type 'void' is not assignable to method's 'this' of type 'I'.
let u: Unused;
let y = u.implicitNoThis;
n = y(12); // ok, callee:void matches this:any
c.explicitVoid = c.implicitThis // ok, implicitThis(this:any)
o.implicitThis = c.implicitThis; // ok, implicitThis(this:any)
o.implicitThis = c.explicitThis; // ok, implicitThis(this:any) is assignable to explicitThis(this: this)
o.implicitThis = i.explicitThis;
i.explicitThis = function(m) {
return this.n.length; // error, this.n: number
~~~~~~
!!! error TS2339: Property 'length' does not exist on type 'number'.
}
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