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Anders Hejlsberg
parent
ae1add7210
commit
c4bad64438
@ -1,43 +1,50 @@
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tests/cases/conformance/types/typeRelationships/typeInference/unionTypeInference.ts(13,5): error TS2403: Subsequent variable declarations must have the same type. Variable 'a3' must be of type 'number', but here has type 'string | number'.
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tests/cases/conformance/types/typeRelationships/typeInference/unionTypeInference.ts(31,5): error TS2403: Subsequent variable declarations must have the same type. Variable 'c2' must be of type 'string', but here has type 'never'.
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tests/cases/conformance/types/typeRelationships/typeInference/unionTypeInference.ts(13,24): error TS2345: Argument of type '1' is not assignable to parameter of type 'string'.
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tests/cases/conformance/types/typeRelationships/typeInference/unionTypeInference.ts(31,13): error TS2345: Argument of type '42' is not assignable to parameter of type 'never'.
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==== tests/cases/conformance/types/typeRelationships/typeInference/unionTypeInference.ts (2 errors) ====
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// Verify that inferences made *to* a type parameter in a union type are secondary
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// to inferences made directly to that type parameter
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declare const b: boolean;
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declare const s: string;
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declare const sn: string | number;
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function f<T>(x: T, y: string|T): T {
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return x;
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}
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declare function f1<T>(x: T, y: string | T): T;
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var a1: number;
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var a1 = f(1, 2);
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var a2: number;
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var a2 = f(1, "hello");
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var a3: number;
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var a3 = f(1, a1 || "hello");
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~~
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!!! error TS2403: Subsequent variable declarations must have the same type. Variable 'a3' must be of type 'number', but here has type 'string | number'.
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!!! related TS6203 tests/cases/conformance/types/typeRelationships/typeInference/unionTypeInference.ts:12:5: 'a3' was also declared here.
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var a4: any;
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var a4 = f(undefined, "abc");
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const a1 = f1(1, 2); // 1 | 2
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const a2 = f1(1, "hello"); // 1
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const a3 = f1(1, sn); // number
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const a4 = f1(undefined, "abc"); // undefined
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const a5 = f1("foo", "bar"); // "foo"
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const a6 = f1(true, false); // boolean
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const a7 = f1("hello", 1); // Error
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~
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!!! error TS2345: Argument of type '1' is not assignable to parameter of type 'string'.
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function g<T>(value: [string, T]): T {
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return value[1];
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}
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declare function f2<T>(value: [string, T]): T;
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var b1: boolean;
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var b1 = g(["string", true]);
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var b1 = f2(["string", true]); // boolean
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function h<T>(x: string|boolean|T): T {
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return typeof x === "string" || typeof x === "boolean" ? undefined : x;
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}
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declare function f3<T>(x: string | false | T): T;
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var c1: number;
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var c1 = h(5);
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var c2: string;
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var c2 = h("abc");
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~~
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!!! error TS2403: Subsequent variable declarations must have the same type. Variable 'c2' must be of type 'string', but here has type 'never'.
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!!! related TS6203 tests/cases/conformance/types/typeRelationships/typeInference/unionTypeInference.ts:30:5: 'c2' was also declared here.
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const c1 = f3(5); // 5
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const c2 = f3(sn); // number
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const c3 = f3(true); // true
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const c4 = f3(b); // true
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const c5 = f3("abc"); // never
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declare function f4<T>(x: string & T): T;
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var d1 = f4("abc");
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var d2 = f4(s);
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var d3 = f4(42); // Error
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~~
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!!! error TS2345: Argument of type '42' is not assignable to parameter of type 'never'.
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// Repros from #32434
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declare function foo<T>(x: T | Promise<T>): void;
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declare let x: false | Promise<true>;
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foo(x);
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declare function bar<T>(x: T, y: string | T): T;
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const y = bar(1, 2);
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@ -1,60 +1,63 @@
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//// [unionTypeInference.ts]
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// Verify that inferences made *to* a type parameter in a union type are secondary
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// to inferences made directly to that type parameter
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declare const b: boolean;
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declare const s: string;
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declare const sn: string | number;
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function f<T>(x: T, y: string|T): T {
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return x;
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}
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declare function f1<T>(x: T, y: string | T): T;
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var a1: number;
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var a1 = f(1, 2);
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var a2: number;
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var a2 = f(1, "hello");
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var a3: number;
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var a3 = f(1, a1 || "hello");
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var a4: any;
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var a4 = f(undefined, "abc");
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const a1 = f1(1, 2); // 1 | 2
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const a2 = f1(1, "hello"); // 1
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const a3 = f1(1, sn); // number
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const a4 = f1(undefined, "abc"); // undefined
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const a5 = f1("foo", "bar"); // "foo"
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const a6 = f1(true, false); // boolean
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const a7 = f1("hello", 1); // Error
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function g<T>(value: [string, T]): T {
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return value[1];
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}
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declare function f2<T>(value: [string, T]): T;
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var b1: boolean;
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var b1 = g(["string", true]);
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var b1 = f2(["string", true]); // boolean
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function h<T>(x: string|boolean|T): T {
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return typeof x === "string" || typeof x === "boolean" ? undefined : x;
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}
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declare function f3<T>(x: string | false | T): T;
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var c1: number;
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var c1 = h(5);
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var c2: string;
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var c2 = h("abc");
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const c1 = f3(5); // 5
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const c2 = f3(sn); // number
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const c3 = f3(true); // true
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const c4 = f3(b); // true
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const c5 = f3("abc"); // never
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declare function f4<T>(x: string & T): T;
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var d1 = f4("abc");
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var d2 = f4(s);
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var d3 = f4(42); // Error
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// Repros from #32434
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declare function foo<T>(x: T | Promise<T>): void;
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declare let x: false | Promise<true>;
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foo(x);
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declare function bar<T>(x: T, y: string | T): T;
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const y = bar(1, 2);
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//// [unionTypeInference.js]
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// Verify that inferences made *to* a type parameter in a union type are secondary
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// to inferences made directly to that type parameter
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function f(x, y) {
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return x;
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}
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var a1;
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var a1 = f(1, 2);
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var a2;
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var a2 = f(1, "hello");
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var a3;
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var a3 = f(1, a1 || "hello");
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var a4;
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var a4 = f(undefined, "abc");
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function g(value) {
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return value[1];
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}
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var b1;
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var b1 = g(["string", true]);
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function h(x) {
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return typeof x === "string" || typeof x === "boolean" ? undefined : x;
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}
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var c1;
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var c1 = h(5);
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var c2;
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var c2 = h("abc");
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"use strict";
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var a1 = f1(1, 2); // 1 | 2
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var a2 = f1(1, "hello"); // 1
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var a3 = f1(1, sn); // number
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var a4 = f1(undefined, "abc"); // undefined
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var a5 = f1("foo", "bar"); // "foo"
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var a6 = f1(true, false); // boolean
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var a7 = f1("hello", 1); // Error
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var b1 = f2(["string", true]); // boolean
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var c1 = f3(5); // 5
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var c2 = f3(sn); // number
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var c3 = f3(true); // true
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var c4 = f3(b); // true
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var c5 = f3("abc"); // never
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var d1 = f4("abc");
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var d2 = f4(s);
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var d3 = f4(42); // Error
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foo(x);
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var y = bar(1, 2);
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@ -1,94 +1,140 @@
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=== tests/cases/conformance/types/typeRelationships/typeInference/unionTypeInference.ts ===
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// Verify that inferences made *to* a type parameter in a union type are secondary
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// to inferences made directly to that type parameter
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declare const b: boolean;
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>b : Symbol(b, Decl(unionTypeInference.ts, 0, 13))
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function f<T>(x: T, y: string|T): T {
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>f : Symbol(f, Decl(unionTypeInference.ts, 0, 0))
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>T : Symbol(T, Decl(unionTypeInference.ts, 3, 11))
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>x : Symbol(x, Decl(unionTypeInference.ts, 3, 14))
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>T : Symbol(T, Decl(unionTypeInference.ts, 3, 11))
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>y : Symbol(y, Decl(unionTypeInference.ts, 3, 19))
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>T : Symbol(T, Decl(unionTypeInference.ts, 3, 11))
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>T : Symbol(T, Decl(unionTypeInference.ts, 3, 11))
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declare const s: string;
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>s : Symbol(s, Decl(unionTypeInference.ts, 1, 13))
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return x;
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>x : Symbol(x, Decl(unionTypeInference.ts, 3, 14))
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}
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declare const sn: string | number;
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>sn : Symbol(sn, Decl(unionTypeInference.ts, 2, 13))
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var a1: number;
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>a1 : Symbol(a1, Decl(unionTypeInference.ts, 7, 3), Decl(unionTypeInference.ts, 8, 3))
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declare function f1<T>(x: T, y: string | T): T;
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>f1 : Symbol(f1, Decl(unionTypeInference.ts, 2, 34))
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>T : Symbol(T, Decl(unionTypeInference.ts, 4, 20))
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>x : Symbol(x, Decl(unionTypeInference.ts, 4, 23))
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>T : Symbol(T, Decl(unionTypeInference.ts, 4, 20))
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>y : Symbol(y, Decl(unionTypeInference.ts, 4, 28))
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>T : Symbol(T, Decl(unionTypeInference.ts, 4, 20))
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>T : Symbol(T, Decl(unionTypeInference.ts, 4, 20))
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var a1 = f(1, 2);
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>a1 : Symbol(a1, Decl(unionTypeInference.ts, 7, 3), Decl(unionTypeInference.ts, 8, 3))
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>f : Symbol(f, Decl(unionTypeInference.ts, 0, 0))
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const a1 = f1(1, 2); // 1 | 2
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>a1 : Symbol(a1, Decl(unionTypeInference.ts, 6, 5))
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>f1 : Symbol(f1, Decl(unionTypeInference.ts, 2, 34))
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var a2: number;
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>a2 : Symbol(a2, Decl(unionTypeInference.ts, 9, 3), Decl(unionTypeInference.ts, 10, 3))
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const a2 = f1(1, "hello"); // 1
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>a2 : Symbol(a2, Decl(unionTypeInference.ts, 7, 5))
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>f1 : Symbol(f1, Decl(unionTypeInference.ts, 2, 34))
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var a2 = f(1, "hello");
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>a2 : Symbol(a2, Decl(unionTypeInference.ts, 9, 3), Decl(unionTypeInference.ts, 10, 3))
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>f : Symbol(f, Decl(unionTypeInference.ts, 0, 0))
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const a3 = f1(1, sn); // number
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>a3 : Symbol(a3, Decl(unionTypeInference.ts, 8, 5))
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>f1 : Symbol(f1, Decl(unionTypeInference.ts, 2, 34))
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>sn : Symbol(sn, Decl(unionTypeInference.ts, 2, 13))
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var a3: number;
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>a3 : Symbol(a3, Decl(unionTypeInference.ts, 11, 3), Decl(unionTypeInference.ts, 12, 3))
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var a3 = f(1, a1 || "hello");
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>a3 : Symbol(a3, Decl(unionTypeInference.ts, 11, 3), Decl(unionTypeInference.ts, 12, 3))
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>f : Symbol(f, Decl(unionTypeInference.ts, 0, 0))
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>a1 : Symbol(a1, Decl(unionTypeInference.ts, 7, 3), Decl(unionTypeInference.ts, 8, 3))
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var a4: any;
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>a4 : Symbol(a4, Decl(unionTypeInference.ts, 13, 3), Decl(unionTypeInference.ts, 14, 3))
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var a4 = f(undefined, "abc");
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>a4 : Symbol(a4, Decl(unionTypeInference.ts, 13, 3), Decl(unionTypeInference.ts, 14, 3))
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>f : Symbol(f, Decl(unionTypeInference.ts, 0, 0))
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const a4 = f1(undefined, "abc"); // undefined
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>a4 : Symbol(a4, Decl(unionTypeInference.ts, 9, 5))
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>f1 : Symbol(f1, Decl(unionTypeInference.ts, 2, 34))
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>undefined : Symbol(undefined)
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function g<T>(value: [string, T]): T {
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>g : Symbol(g, Decl(unionTypeInference.ts, 14, 29))
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>T : Symbol(T, Decl(unionTypeInference.ts, 16, 11))
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>value : Symbol(value, Decl(unionTypeInference.ts, 16, 14))
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>T : Symbol(T, Decl(unionTypeInference.ts, 16, 11))
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>T : Symbol(T, Decl(unionTypeInference.ts, 16, 11))
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const a5 = f1("foo", "bar"); // "foo"
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>a5 : Symbol(a5, Decl(unionTypeInference.ts, 10, 5))
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>f1 : Symbol(f1, Decl(unionTypeInference.ts, 2, 34))
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return value[1];
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>value : Symbol(value, Decl(unionTypeInference.ts, 16, 14))
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>1 : Symbol(1)
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}
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const a6 = f1(true, false); // boolean
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>a6 : Symbol(a6, Decl(unionTypeInference.ts, 11, 5))
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>f1 : Symbol(f1, Decl(unionTypeInference.ts, 2, 34))
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var b1: boolean;
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>b1 : Symbol(b1, Decl(unionTypeInference.ts, 20, 3), Decl(unionTypeInference.ts, 21, 3))
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const a7 = f1("hello", 1); // Error
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>a7 : Symbol(a7, Decl(unionTypeInference.ts, 12, 5))
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>f1 : Symbol(f1, Decl(unionTypeInference.ts, 2, 34))
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var b1 = g(["string", true]);
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>b1 : Symbol(b1, Decl(unionTypeInference.ts, 20, 3), Decl(unionTypeInference.ts, 21, 3))
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>g : Symbol(g, Decl(unionTypeInference.ts, 14, 29))
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declare function f2<T>(value: [string, T]): T;
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>f2 : Symbol(f2, Decl(unionTypeInference.ts, 12, 26))
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>T : Symbol(T, Decl(unionTypeInference.ts, 14, 20))
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>value : Symbol(value, Decl(unionTypeInference.ts, 14, 23))
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>T : Symbol(T, Decl(unionTypeInference.ts, 14, 20))
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>T : Symbol(T, Decl(unionTypeInference.ts, 14, 20))
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function h<T>(x: string|boolean|T): T {
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>h : Symbol(h, Decl(unionTypeInference.ts, 21, 29))
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>T : Symbol(T, Decl(unionTypeInference.ts, 23, 11))
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>x : Symbol(x, Decl(unionTypeInference.ts, 23, 14))
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>T : Symbol(T, Decl(unionTypeInference.ts, 23, 11))
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>T : Symbol(T, Decl(unionTypeInference.ts, 23, 11))
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var b1 = f2(["string", true]); // boolean
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>b1 : Symbol(b1, Decl(unionTypeInference.ts, 16, 3))
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>f2 : Symbol(f2, Decl(unionTypeInference.ts, 12, 26))
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return typeof x === "string" || typeof x === "boolean" ? undefined : x;
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>x : Symbol(x, Decl(unionTypeInference.ts, 23, 14))
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>x : Symbol(x, Decl(unionTypeInference.ts, 23, 14))
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>undefined : Symbol(undefined)
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>x : Symbol(x, Decl(unionTypeInference.ts, 23, 14))
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}
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declare function f3<T>(x: string | false | T): T;
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>f3 : Symbol(f3, Decl(unionTypeInference.ts, 16, 30))
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>T : Symbol(T, Decl(unionTypeInference.ts, 18, 20))
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>x : Symbol(x, Decl(unionTypeInference.ts, 18, 23))
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>T : Symbol(T, Decl(unionTypeInference.ts, 18, 20))
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>T : Symbol(T, Decl(unionTypeInference.ts, 18, 20))
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var c1: number;
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>c1 : Symbol(c1, Decl(unionTypeInference.ts, 27, 3), Decl(unionTypeInference.ts, 28, 3))
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const c1 = f3(5); // 5
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>c1 : Symbol(c1, Decl(unionTypeInference.ts, 20, 5))
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>f3 : Symbol(f3, Decl(unionTypeInference.ts, 16, 30))
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var c1 = h(5);
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>c1 : Symbol(c1, Decl(unionTypeInference.ts, 27, 3), Decl(unionTypeInference.ts, 28, 3))
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>h : Symbol(h, Decl(unionTypeInference.ts, 21, 29))
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const c2 = f3(sn); // number
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>c2 : Symbol(c2, Decl(unionTypeInference.ts, 21, 5))
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>f3 : Symbol(f3, Decl(unionTypeInference.ts, 16, 30))
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>sn : Symbol(sn, Decl(unionTypeInference.ts, 2, 13))
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var c2: string;
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>c2 : Symbol(c2, Decl(unionTypeInference.ts, 29, 3), Decl(unionTypeInference.ts, 30, 3))
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const c3 = f3(true); // true
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>c3 : Symbol(c3, Decl(unionTypeInference.ts, 22, 5))
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>f3 : Symbol(f3, Decl(unionTypeInference.ts, 16, 30))
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var c2 = h("abc");
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>c2 : Symbol(c2, Decl(unionTypeInference.ts, 29, 3), Decl(unionTypeInference.ts, 30, 3))
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>h : Symbol(h, Decl(unionTypeInference.ts, 21, 29))
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const c4 = f3(b); // true
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>c4 : Symbol(c4, Decl(unionTypeInference.ts, 23, 5))
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>f3 : Symbol(f3, Decl(unionTypeInference.ts, 16, 30))
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>b : Symbol(b, Decl(unionTypeInference.ts, 0, 13))
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const c5 = f3("abc"); // never
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>c5 : Symbol(c5, Decl(unionTypeInference.ts, 24, 5))
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>f3 : Symbol(f3, Decl(unionTypeInference.ts, 16, 30))
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declare function f4<T>(x: string & T): T;
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>f4 : Symbol(f4, Decl(unionTypeInference.ts, 24, 21))
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>T : Symbol(T, Decl(unionTypeInference.ts, 26, 20))
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>x : Symbol(x, Decl(unionTypeInference.ts, 26, 23))
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>T : Symbol(T, Decl(unionTypeInference.ts, 26, 20))
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>T : Symbol(T, Decl(unionTypeInference.ts, 26, 20))
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var d1 = f4("abc");
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>d1 : Symbol(d1, Decl(unionTypeInference.ts, 28, 3))
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>f4 : Symbol(f4, Decl(unionTypeInference.ts, 24, 21))
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|
||||
var d2 = f4(s);
|
||||
>d2 : Symbol(d2, Decl(unionTypeInference.ts, 29, 3))
|
||||
>f4 : Symbol(f4, Decl(unionTypeInference.ts, 24, 21))
|
||||
>s : Symbol(s, Decl(unionTypeInference.ts, 1, 13))
|
||||
|
||||
var d3 = f4(42); // Error
|
||||
>d3 : Symbol(d3, Decl(unionTypeInference.ts, 30, 3))
|
||||
>f4 : Symbol(f4, Decl(unionTypeInference.ts, 24, 21))
|
||||
|
||||
// Repros from #32434
|
||||
|
||||
declare function foo<T>(x: T | Promise<T>): void;
|
||||
>foo : Symbol(foo, Decl(unionTypeInference.ts, 30, 16))
|
||||
>T : Symbol(T, Decl(unionTypeInference.ts, 34, 21))
|
||||
>x : Symbol(x, Decl(unionTypeInference.ts, 34, 24))
|
||||
>T : Symbol(T, Decl(unionTypeInference.ts, 34, 21))
|
||||
>Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --))
|
||||
>T : Symbol(T, Decl(unionTypeInference.ts, 34, 21))
|
||||
|
||||
declare let x: false | Promise<true>;
|
||||
>x : Symbol(x, Decl(unionTypeInference.ts, 35, 11))
|
||||
>Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --))
|
||||
|
||||
foo(x);
|
||||
>foo : Symbol(foo, Decl(unionTypeInference.ts, 30, 16))
|
||||
>x : Symbol(x, Decl(unionTypeInference.ts, 35, 11))
|
||||
|
||||
declare function bar<T>(x: T, y: string | T): T;
|
||||
>bar : Symbol(bar, Decl(unionTypeInference.ts, 36, 7))
|
||||
>T : Symbol(T, Decl(unionTypeInference.ts, 38, 21))
|
||||
>x : Symbol(x, Decl(unionTypeInference.ts, 38, 24))
|
||||
>T : Symbol(T, Decl(unionTypeInference.ts, 38, 21))
|
||||
>y : Symbol(y, Decl(unionTypeInference.ts, 38, 29))
|
||||
>T : Symbol(T, Decl(unionTypeInference.ts, 38, 21))
|
||||
>T : Symbol(T, Decl(unionTypeInference.ts, 38, 21))
|
||||
|
||||
const y = bar(1, 2);
|
||||
>y : Symbol(y, Decl(unionTypeInference.ts, 39, 5))
|
||||
>bar : Symbol(bar, Decl(unionTypeInference.ts, 36, 7))
|
||||
|
||||
|
||||
@ -1,113 +1,161 @@
|
||||
=== tests/cases/conformance/types/typeRelationships/typeInference/unionTypeInference.ts ===
|
||||
// Verify that inferences made *to* a type parameter in a union type are secondary
|
||||
// to inferences made directly to that type parameter
|
||||
declare const b: boolean;
|
||||
>b : boolean
|
||||
|
||||
function f<T>(x: T, y: string|T): T {
|
||||
>f : <T>(x: T, y: string | T) => T
|
||||
declare const s: string;
|
||||
>s : string
|
||||
|
||||
declare const sn: string | number;
|
||||
>sn : string | number
|
||||
|
||||
declare function f1<T>(x: T, y: string | T): T;
|
||||
>f1 : <T>(x: T, y: string | T) => T
|
||||
>x : T
|
||||
>y : string | T
|
||||
|
||||
return x;
|
||||
>x : T
|
||||
}
|
||||
|
||||
var a1: number;
|
||||
>a1 : number
|
||||
|
||||
var a1 = f(1, 2);
|
||||
>a1 : number
|
||||
>f(1, 2) : 1 | 2
|
||||
>f : <T>(x: T, y: string | T) => T
|
||||
const a1 = f1(1, 2); // 1 | 2
|
||||
>a1 : 1 | 2
|
||||
>f1(1, 2) : 1 | 2
|
||||
>f1 : <T>(x: T, y: string | T) => T
|
||||
>1 : 1
|
||||
>2 : 2
|
||||
|
||||
var a2: number;
|
||||
>a2 : number
|
||||
|
||||
var a2 = f(1, "hello");
|
||||
>a2 : number
|
||||
>f(1, "hello") : 1
|
||||
>f : <T>(x: T, y: string | T) => T
|
||||
const a2 = f1(1, "hello"); // 1
|
||||
>a2 : 1
|
||||
>f1(1, "hello") : 1
|
||||
>f1 : <T>(x: T, y: string | T) => T
|
||||
>1 : 1
|
||||
>"hello" : "hello"
|
||||
|
||||
var a3: number;
|
||||
const a3 = f1(1, sn); // number
|
||||
>a3 : number
|
||||
|
||||
var a3 = f(1, a1 || "hello");
|
||||
>a3 : number
|
||||
>f(1, a1 || "hello") : number | "hello"
|
||||
>f : <T>(x: T, y: string | T) => T
|
||||
>f1(1, sn) : number
|
||||
>f1 : <T>(x: T, y: string | T) => T
|
||||
>1 : 1
|
||||
>a1 || "hello" : number | "hello"
|
||||
>a1 : number
|
||||
>"hello" : "hello"
|
||||
>sn : string | number
|
||||
|
||||
var a4: any;
|
||||
>a4 : any
|
||||
|
||||
var a4 = f(undefined, "abc");
|
||||
>a4 : any
|
||||
>f(undefined, "abc") : any
|
||||
>f : <T>(x: T, y: string | T) => T
|
||||
const a4 = f1(undefined, "abc"); // undefined
|
||||
>a4 : undefined
|
||||
>f1(undefined, "abc") : undefined
|
||||
>f1 : <T>(x: T, y: string | T) => T
|
||||
>undefined : undefined
|
||||
>"abc" : "abc"
|
||||
|
||||
function g<T>(value: [string, T]): T {
|
||||
>g : <T>(value: [string, T]) => T
|
||||
>value : [string, T]
|
||||
const a5 = f1("foo", "bar"); // "foo"
|
||||
>a5 : "foo"
|
||||
>f1("foo", "bar") : "foo"
|
||||
>f1 : <T>(x: T, y: string | T) => T
|
||||
>"foo" : "foo"
|
||||
>"bar" : "bar"
|
||||
|
||||
return value[1];
|
||||
>value[1] : T
|
||||
>value : [string, T]
|
||||
const a6 = f1(true, false); // boolean
|
||||
>a6 : boolean
|
||||
>f1(true, false) : boolean
|
||||
>f1 : <T>(x: T, y: string | T) => T
|
||||
>true : true
|
||||
>false : false
|
||||
|
||||
const a7 = f1("hello", 1); // Error
|
||||
>a7 : any
|
||||
>f1("hello", 1) : any
|
||||
>f1 : <T>(x: T, y: string | T) => T
|
||||
>"hello" : "hello"
|
||||
>1 : 1
|
||||
}
|
||||
|
||||
var b1: boolean;
|
||||
>b1 : boolean
|
||||
declare function f2<T>(value: [string, T]): T;
|
||||
>f2 : <T>(value: [string, T]) => T
|
||||
>value : [string, T]
|
||||
|
||||
var b1 = g(["string", true]);
|
||||
var b1 = f2(["string", true]); // boolean
|
||||
>b1 : boolean
|
||||
>g(["string", true]) : boolean
|
||||
>g : <T>(value: [string, T]) => T
|
||||
>f2(["string", true]) : boolean
|
||||
>f2 : <T>(value: [string, T]) => T
|
||||
>["string", true] : [string, true]
|
||||
>"string" : "string"
|
||||
>true : true
|
||||
|
||||
function h<T>(x: string|boolean|T): T {
|
||||
>h : <T>(x: string | boolean | T) => T
|
||||
>x : string | boolean | T
|
||||
declare function f3<T>(x: string | false | T): T;
|
||||
>f3 : <T>(x: string | false | T) => T
|
||||
>x : string | false | T
|
||||
>false : false
|
||||
|
||||
return typeof x === "string" || typeof x === "boolean" ? undefined : x;
|
||||
>typeof x === "string" || typeof x === "boolean" ? undefined : x : T
|
||||
>typeof x === "string" || typeof x === "boolean" : boolean
|
||||
>typeof x === "string" : boolean
|
||||
>typeof x : "string" | "number" | "bigint" | "boolean" | "symbol" | "undefined" | "object" | "function"
|
||||
>x : string | boolean | T
|
||||
>"string" : "string"
|
||||
>typeof x === "boolean" : boolean
|
||||
>typeof x : "string" | "number" | "bigint" | "boolean" | "symbol" | "undefined" | "object" | "function"
|
||||
>x : boolean | T
|
||||
>"boolean" : "boolean"
|
||||
>undefined : undefined
|
||||
>x : T
|
||||
}
|
||||
|
||||
var c1: number;
|
||||
>c1 : number
|
||||
|
||||
var c1 = h(5);
|
||||
>c1 : number
|
||||
>h(5) : 5
|
||||
>h : <T>(x: string | boolean | T) => T
|
||||
const c1 = f3(5); // 5
|
||||
>c1 : 5
|
||||
>f3(5) : 5
|
||||
>f3 : <T>(x: string | false | T) => T
|
||||
>5 : 5
|
||||
|
||||
var c2: string;
|
||||
>c2 : string
|
||||
const c2 = f3(sn); // number
|
||||
>c2 : number
|
||||
>f3(sn) : number
|
||||
>f3 : <T>(x: string | false | T) => T
|
||||
>sn : string | number
|
||||
|
||||
var c2 = h("abc");
|
||||
>c2 : string
|
||||
>h("abc") : never
|
||||
>h : <T>(x: string | boolean | T) => T
|
||||
const c3 = f3(true); // true
|
||||
>c3 : true
|
||||
>f3(true) : true
|
||||
>f3 : <T>(x: string | false | T) => T
|
||||
>true : true
|
||||
|
||||
const c4 = f3(b); // true
|
||||
>c4 : true
|
||||
>f3(b) : true
|
||||
>f3 : <T>(x: string | false | T) => T
|
||||
>b : boolean
|
||||
|
||||
const c5 = f3("abc"); // never
|
||||
>c5 : never
|
||||
>f3("abc") : never
|
||||
>f3 : <T>(x: string | false | T) => T
|
||||
>"abc" : "abc"
|
||||
|
||||
declare function f4<T>(x: string & T): T;
|
||||
>f4 : <T>(x: string & T) => T
|
||||
>x : string & T
|
||||
|
||||
var d1 = f4("abc");
|
||||
>d1 : string
|
||||
>f4("abc") : "abc"
|
||||
>f4 : <T>(x: string & T) => T
|
||||
>"abc" : "abc"
|
||||
|
||||
var d2 = f4(s);
|
||||
>d2 : unknown
|
||||
>f4(s) : unknown
|
||||
>f4 : <T>(x: string & T) => T
|
||||
>s : string
|
||||
|
||||
var d3 = f4(42); // Error
|
||||
>d3 : any
|
||||
>f4(42) : any
|
||||
>f4 : <T>(x: string & T) => T
|
||||
>42 : 42
|
||||
|
||||
// Repros from #32434
|
||||
|
||||
declare function foo<T>(x: T | Promise<T>): void;
|
||||
>foo : <T>(x: T | Promise<T>) => void
|
||||
>x : T | Promise<T>
|
||||
|
||||
declare let x: false | Promise<true>;
|
||||
>x : false | Promise<true>
|
||||
>false : false
|
||||
>true : true
|
||||
|
||||
foo(x);
|
||||
>foo(x) : void
|
||||
>foo : <T>(x: T | Promise<T>) => void
|
||||
>x : false | Promise<true>
|
||||
|
||||
declare function bar<T>(x: T, y: string | T): T;
|
||||
>bar : <T>(x: T, y: string | T) => T
|
||||
>x : T
|
||||
>y : string | T
|
||||
|
||||
const y = bar(1, 2);
|
||||
>y : 1 | 2
|
||||
>bar(1, 2) : 1 | 2
|
||||
>bar : <T>(x: T, y: string | T) => T
|
||||
>1 : 1
|
||||
>2 : 2
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user