1.3.13 • Published 4 years ago
xmiot-form v1.3.13
兜底原则: 在参数传递过程中,对于某个参数的缺失需要在最终使用其参数的函数中进行兜底(默认值)
typescript infer使用技巧
type ElementOf<T> = T extends Array<infer E> ? E : never
type TTuple = [string, number];
type ToUnion = ElementOf<TTuple>;
typescript extends
再类型中extends表示是否能赋值
T extends U ? X : Y 表示如果T能赋值给U则类型为X,否则Y
作为*泛型参数*时,如果T是union类型,则会被被分解进行比对:
type NonNullable<T> = T extends null | undefined ? never : T;
type NonNullable<'1' | '2'>
会被分解为
'1' extends null | undefined ? never : T | '2' extends null | undefined ? never : T
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