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nmsn opened this issue Dec 7, 2022 · 2 comments
Open

ConstructorParameters<Type> #12

nmsn opened this issue Dec 7, 2022 · 2 comments

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@nmsn
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nmsn commented Dec 7, 2022

Constructs a tuple or array type from the types of a constructor function type. It produces a tuple type with all the parameter types (or the type never if Type is not a function).

type T0 = ConstructorParameters<ErrorConstructor>;
// type T0 = [message?: string]

type T1 = ConstructorParameters<FunctionConstructor>;
// type T1 = string[]

type T2 = ConstructorParameters<RegExpConstructor>;
// type T2 = [pattern: string | RegExp, flags?: string]

type T3 = ConstructorParameters<any>;
// type T3 = unknown[]

type T4 = ConstructorParameters<Function>;
// Type 'Function' does not satisfy the constraint 'abstract new (...args: any) => any'.
// Type 'Function' provides no match for the signature 'new (...args: any): any'.
// type T4 = never
@nmsn
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nmsn commented Dec 7, 2022

/**
 * Obtain the parameters of a constructor function type in a tuple
 */
type ConstructorParameters<T extends abstract new (...args: any) => any> = T extends abstract new (...args: infer P) => any ? P : never;

@nmsn
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nmsn commented Dec 7, 2022

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