tests/cases/conformance/types/tuple/contextualTypeWithTuple.ts(3,5): error TS2322: Type '[number, string, boolean]' is not assignable to type '[number, string]'. Types of property 'pop' are incompatible. Type '() => string | number | boolean' is not assignable to type '() => string | number'. Type 'string | number | boolean' is not assignable to type 'string | number'. Type 'boolean' is not assignable to type 'string | number'. Type 'boolean' is not assignable to type 'number'. tests/cases/conformance/types/tuple/contextualTypeWithTuple.ts(15,1): error TS2322: Type '[number, string, boolean]' is not assignable to type '[number, string]'. tests/cases/conformance/types/tuple/contextualTypeWithTuple.ts(18,1): error TS2322: Type '[{}, number]' is not assignable to type '[{ a: string; }, number]'. Types of property '0' are incompatible. Type '{}' is not assignable to type '{ a: string; }'. Property 'a' is missing in type '{}'. tests/cases/conformance/types/tuple/contextualTypeWithTuple.ts(19,1): error TS2322: Type '[number, string]' is not assignable to type '[number, string, boolean]'. Property '2' is missing in type '[number, string]'. tests/cases/conformance/types/tuple/contextualTypeWithTuple.ts(20,5): error TS2322: Type '[string, string, number]' is not assignable to type '[string, string]'. Types of property 'pop' are incompatible. Type '() => string | number' is not assignable to type '() => string'. Type 'string | number' is not assignable to type 'string'. Type 'number' is not assignable to type 'string'. tests/cases/conformance/types/tuple/contextualTypeWithTuple.ts(24,1): error TS2322: Type '[C, string | number]' is not assignable to type '[C, string | number, D]'. Property '2' is missing in type '[C, string | number]'. tests/cases/conformance/types/tuple/contextualTypeWithTuple.ts(25,1): error TS2322: Type '[number, string | number]' is not assignable to type '[number, string]'. Types of property '1' are incompatible. Type 'string | number' is not assignable to type 'string'. Type 'number' is not assignable to type 'string'. ==== tests/cases/conformance/types/tuple/contextualTypeWithTuple.ts (7 errors) ==== // no error var numStrTuple: [number, string] = [5, "hello"]; var numStrTuple2: [number, string] = [5, "foo", true]; ~~~~~~~~~~~~ !!! error TS2322: Type '[number, string, boolean]' is not assignable to type '[number, string]'. !!! error TS2322: Types of property 'pop' are incompatible. !!! error TS2322: Type '() => string | number | boolean' is not assignable to type '() => string | number'. !!! error TS2322: Type 'string | number | boolean' is not assignable to type 'string | number'. !!! error TS2322: Type 'boolean' is not assignable to type 'string | number'. !!! error TS2322: Type 'boolean' is not assignable to type 'number'. var numStrBoolTuple: [number, string, boolean] = [5, "foo", true]; var objNumTuple: [{ a: string }, number] = [{ a: "world" }, 5]; var strTupleTuple: [string, [number, {}]] = ["bar", [5, { x: 1, y: 1 }]]; class C { } class D { } var unionTuple: [C, string | number] = [new C(), "foo"]; var unionTuple1: [C, string | number] = [new C(), "foo"]; var unionTuple2: [C, string | number, D] = [new C(), "foo", new D()]; var unionTuple3: [number, string| number] = [10, "foo"]; numStrTuple = numStrTuple2; numStrTuple = numStrBoolTuple; ~~~~~~~~~~~ !!! error TS2322: Type '[number, string, boolean]' is not assignable to type '[number, string]'. // error objNumTuple = [ {}, 5]; ~~~~~~~~~~~ !!! error TS2322: Type '[{}, number]' is not assignable to type '[{ a: string; }, number]'. !!! error TS2322: Types of property '0' are incompatible. !!! error TS2322: Type '{}' is not assignable to type '{ a: string; }'. !!! error TS2322: Property 'a' is missing in type '{}'. numStrBoolTuple = numStrTuple; ~~~~~~~~~~~~~~~ !!! error TS2322: Type '[number, string]' is not assignable to type '[number, string, boolean]'. !!! error TS2322: Property '2' is missing in type '[number, string]'. var strStrTuple: [string, string] = ["foo", "bar", 5]; ~~~~~~~~~~~ !!! error TS2322: Type '[string, string, number]' is not assignable to type '[string, string]'. !!! error TS2322: Types of property 'pop' are incompatible. !!! error TS2322: Type '() => string | number' is not assignable to type '() => string'. !!! error TS2322: Type 'string | number' is not assignable to type 'string'. !!! error TS2322: Type 'number' is not assignable to type 'string'. unionTuple = unionTuple1; unionTuple = unionTuple2; unionTuple2 = unionTuple; ~~~~~~~~~~~ !!! error TS2322: Type '[C, string | number]' is not assignable to type '[C, string | number, D]'. !!! error TS2322: Property '2' is missing in type '[C, string | number]'. numStrTuple = unionTuple3; ~~~~~~~~~~~ !!! error TS2322: Type '[number, string | number]' is not assignable to type '[number, string]'. !!! error TS2322: Types of property '1' are incompatible. !!! error TS2322: Type 'string | number' is not assignable to type 'string'. !!! error TS2322: Type 'number' is not assignable to type 'string'.