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JsonFreemanJsonFreeman
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Merge pull request microsoft#3902 from Microsoft/tupleTypesAny
Don't fall back to any when typing tuples
2 parents 33794b7 + 27c339a commit fbe60c9

18 files changed

+89
-5
lines changed

‎src/compiler/checker.ts

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@@ -2274,10 +2274,6 @@ namespace ts {
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// fact an iterable or array (depending on target language).
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let elementType = checkIteratedTypeOrElementType(parentType, pattern, /*allowStringInput*/ false);
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if (!declaration.dotDotDotToken) {
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if (isTypeAny(elementType)) {
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return elementType;
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}
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// Use specific property type when parent is a tuple or numeric index type when parent is an array
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let propName = "" + indexOf(pattern.elements, declaration);
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type = isTupleLikeType(parentType)

‎tests/baselines/reference/arityAndOrderCompatibility01.errors.txt

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@@ -1,6 +1,7 @@
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tests/cases/conformance/types/tuple/arityAndOrderCompatibility01.ts(13,12): error TS2493: Tuple type '[string, number]' with length '2' cannot be assigned to tuple with length '3'.
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tests/cases/conformance/types/tuple/arityAndOrderCompatibility01.ts(14,12): error TS2460: Type 'StrNum' has no property '2'.
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tests/cases/conformance/types/tuple/arityAndOrderCompatibility01.ts(15,5): error TS2461: Type '{ 0: string; 1: number; }' is not an array type.
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tests/cases/conformance/types/tuple/arityAndOrderCompatibility01.ts(15,12): error TS2460: Type '{ 0: string; 1: number; }' has no property '2'.
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tests/cases/conformance/types/tuple/arityAndOrderCompatibility01.ts(16,5): error TS2322: Type '[string, number]' is not assignable to type '[number, number, number]'.
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Types of property '0' are incompatible.
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Type 'string' is not assignable to type 'number'.
@@ -46,7 +47,7 @@ tests/cases/conformance/types/tuple/arityAndOrderCompatibility01.ts(30,5): error
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Type 'string' is not assignable to type 'number'.
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==== tests/cases/conformance/types/tuple/arityAndOrderCompatibility01.ts (18 errors) ====
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==== tests/cases/conformance/types/tuple/arityAndOrderCompatibility01.ts (19 errors) ====
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interface StrNum extends Array<string|number> {
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0: string;
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1: number;
@@ -68,6 +69,8 @@ tests/cases/conformance/types/tuple/arityAndOrderCompatibility01.ts(30,5): error
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var [g, h, i] = z;
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~~~~~~~~~
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!!! error TS2461: Type '{ 0: string; 1: number; }' is not an array type.
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~
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!!! error TS2460: Type '{ 0: string; 1: number; }' has no property '2'.
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var j1: [number, number, number] = x;
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~~
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!!! error TS2322: Type '[string, number]' is not assignable to type '[number, number, number]'.

‎tests/baselines/reference/tupleElementTypes1.js

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//// [tupleElementTypes1.ts]
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var [a, b]: [number, any] = [undefined, undefined];
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//// [tupleElementTypes1.js]
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var _a = [undefined, undefined], a = _a[0], b = _a[1];

‎tests/baselines/reference/tupleElementTypes1.symbols

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=== tests/cases/conformance/types/tuple/tupleElementTypes1.ts ===
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var [a, b]: [number, any] = [undefined, undefined];
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>a : Symbol(a, Decl(tupleElementTypes1.ts, 0, 5))
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>b : Symbol(b, Decl(tupleElementTypes1.ts, 0, 7))
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>undefined : Symbol(undefined)
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>undefined : Symbol(undefined)
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‎tests/baselines/reference/tupleElementTypes1.types

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=== tests/cases/conformance/types/tuple/tupleElementTypes1.ts ===
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var [a, b]: [number, any] = [undefined, undefined];
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>a : number
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>b : any
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>[undefined, undefined] : [undefined, undefined]
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>undefined : undefined
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>undefined : undefined
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‎tests/baselines/reference/tupleElementTypes2.js

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//// [tupleElementTypes2.ts]
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function f([a, b]: [number, any]) { }
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//// [tupleElementTypes2.js]
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function f(_a) {
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var a = _a[0], b = _a[1];
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}

‎tests/baselines/reference/tupleElementTypes2.symbols

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=== tests/cases/conformance/types/tuple/tupleElementTypes2.ts ===
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function f([a, b]: [number, any]) { }
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>f : Symbol(f, Decl(tupleElementTypes2.ts, 0, 0))
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>a : Symbol(a, Decl(tupleElementTypes2.ts, 0, 12))
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>b : Symbol(b, Decl(tupleElementTypes2.ts, 0, 14))
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‎tests/baselines/reference/tupleElementTypes2.types

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=== tests/cases/conformance/types/tuple/tupleElementTypes2.ts ===
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function f([a, b]: [number, any]) { }
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>f : ([a, b]: [number, any]) => void
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>a : number
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>b : any
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‎tests/baselines/reference/tupleElementTypes3.js

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//// [tupleElementTypes3.ts]
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var [a, b] = [0, undefined];
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//// [tupleElementTypes3.js]
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var _a = [0, undefined], a = _a[0], b = _a[1];

‎tests/baselines/reference/tupleElementTypes3.symbols

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=== tests/cases/conformance/types/tuple/tupleElementTypes3.ts ===
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var [a, b] = [0, undefined];
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>a : Symbol(a, Decl(tupleElementTypes3.ts, 0, 5))
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>b : Symbol(b, Decl(tupleElementTypes3.ts, 0, 7))
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>undefined : Symbol(undefined)
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‎tests/baselines/reference/tupleElementTypes3.types

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=== tests/cases/conformance/types/tuple/tupleElementTypes3.ts ===
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var [a, b] = [0, undefined];
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>a : number
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>b : any
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>[0, undefined] : [number, undefined]
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>0 : number
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>undefined : undefined
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‎tests/baselines/reference/tupleElementTypes4.js

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//// [tupleElementTypes4.ts]
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function f([a, b] = [0, undefined]) { }
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//// [tupleElementTypes4.js]
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function f(_a) {
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var _b = _a === void 0 ? [0, undefined] : _a, a = _b[0], b = _b[1];
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}

‎tests/baselines/reference/tupleElementTypes4.symbols

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=== tests/cases/conformance/types/tuple/tupleElementTypes4.ts ===
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function f([a, b] = [0, undefined]) { }
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>f : Symbol(f, Decl(tupleElementTypes4.ts, 0, 0))
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>a : Symbol(a, Decl(tupleElementTypes4.ts, 0, 12))
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>b : Symbol(b, Decl(tupleElementTypes4.ts, 0, 14))
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>undefined : Symbol(undefined)
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‎tests/baselines/reference/tupleElementTypes4.types

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=== tests/cases/conformance/types/tuple/tupleElementTypes4.ts ===
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function f([a, b] = [0, undefined]) { }
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>f : ([a, b]?: [number, any]) => void
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>a : number
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>b : any
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>[0, undefined] : [number, undefined]
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>0 : number
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>undefined : undefined
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‎tests/cases/conformance/types/tuple/tupleElementTypes1.ts

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var [a, b]: [number, any] = [undefined, undefined];

‎tests/cases/conformance/types/tuple/tupleElementTypes2.ts

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function f([a, b]: [number, any]) { }

‎tests/cases/conformance/types/tuple/tupleElementTypes3.ts

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var [a, b] = [0, undefined];

‎tests/cases/conformance/types/tuple/tupleElementTypes4.ts

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function f([a, b] = [0, undefined]) { }

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