TypeScript utilities for dealing with array length. Of course, type predicates inside.
Useful for codebase with noUncheckedIndexedAccess turned on.
npm i -D ts-array-length
Returns true if arr.length === len.
// const arr: string[]
if (hasLength(arr, 1)) {
// arr: readonly [string]
const str: string = arr[0];
}Returns true if arr.length >= len.
// const arr: string[]
if (hasMinLength(arr, 1)) {
// arr: readonly [string, ...string[]]
const str: string = arr[0];
}Returns true if arr.length >= 1.
// const arr: string[]
if (isNonEmpty(arr)) {
// arr: readonly [string, ...string[]]
const str: string = arr[0];
}Tuple type whose element type is T and has exact length N.
// readonly [string, string, string]
type SSS = ReadonlyArrayExactLength<string, 3>;Tuple type whose element type is T and has at least N elements.
// readonly [string, string, string, ...string[]]
type SSS = ReadonlyArrayMinLength<string, 3>;MIT