20 lines
713 B
TypeScript
20 lines
713 B
TypeScript
module Underscore {
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export interface Iterator<T, U> {
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(value: T, index: any, list: any): U;
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}
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export interface Static {
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all<T>(list: T[], iterator?: Iterator<T, boolean>, context?: any): boolean;
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identity<T>(value: T): T;
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}
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}
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declare var _: Underscore.Static;
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// No error, Call signatures of types '<T>(value: T) => T' and 'Underscore.Iterator<{}, boolean>' are compatible when instantiated with any.
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// Ideally, we would not have a generic signature here, because it should be instantiated with {} during inferential typing
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_.all([true, 1, null, 'yes'], _.identity);
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// Ok, because fixing makes us infer boolean for T
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_.all([true], _.identity);
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