20 lines
1.2 KiB
Plaintext
20 lines
1.2 KiB
Plaintext
tests/cases/compiler/promiseChaining1.ts(7,50): error TS2345: Argument of type '(x: S) => string' is not assignable to parameter of type '(x: S) => Function'.
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Type 'string' is not assignable to type 'Function'.
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Property 'apply' is missing in type 'String'.
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==== tests/cases/compiler/promiseChaining1.ts (1 errors) ====
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// same example but with constraints on each type parameter
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class Chain2<T extends { length: number }> {
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constructor(public value: T) { }
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then<S extends Function>(cb: (x: T) => S): Chain2<S> {
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var result = cb(this.value);
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// should get a fresh type parameter which each then call
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var z = this.then(x => result)/*S*/.then(x => "abc")/*Function*/.then(x => x.length)/*number*/; // Should error on "abc" because it is not a Function
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~~~~~~~~~~
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!!! error TS2345: Argument of type '(x: S) => string' is not assignable to parameter of type '(x: S) => Function'.
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!!! error TS2345: Type 'string' is not assignable to type 'Function'.
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!!! error TS2345: Property 'apply' is missing in type 'String'.
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return new Chain2(result);
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}
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} |