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btoo/array-element-type.ts

Last active August 14, 2019 19:32
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infer the type of an element in an array from the array's type
Raw
array-element-type.ts
type ArrayElement<ArrayType> =
ArrayType extends (infer ElementType)[] ? ElementType :
ArrayType extends ReadonlyArray<infer ElementType> ? ElementType :
never;
type Flatten<T> = T extends Array<infer U> ? U : T;
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