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Forked from wmakeev/NullableKeys.md
Created January 12, 2021 09:57
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[TypeScript Tips] #typescript #tips #cheatsheet
Raw
function-wrapper.md

Function wrapper

function spreadsheetErrorHandler<T extends (...args: any[]) => any>(
  func: T
): T {
  return <T>function (...args: any[]) {
    try {
      return func(...args)
    } catch (err) {
      if (
        err instanceof SpreadsheetHelper.SpreadsheetHelperError &&
        err.range
      ) {
        throw new CellValueError(err.message, err.range)
      }

      throw err
    }
  }
}
Raw
select-keys-by-type.md

Select keys by type

type StringOrNumber = string | number

interface A {
  a: string
  b: number
  c: string[]
  d: Date
}

type SelectKeys<T, V> = { [K in keyof T]: T[K] extends V ? K : never }[keyof T];

type keys = SelectKeys<A, StringOrNumber> // type keys = "a" | "b"
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