Typescript踩坑笔记

[AndreGeng]

1. 如何获取enum的键值

   const enum DurationUnit {
   y = 'y',
   mo = 'mo',
   w = 'w',
   d = 'd',
   h = 'h',
   m = 'm',
   s = 's',
   ms = 'ms',
   }
   export type DurationUnitKey = keyof typeof DurationUnit;

   解释见keyof Enum

2. Argument of type 'string' is not assignable to parameter of type 'never'.

   ['1', '2'].reduce((acc, item) => {
   acc.push(item);
   return acc;
   }, [])

   空数组被推断出的type为never, 这里把空数组类型强转为string[]. [] as string[]