@feugene/mu/src/internal/base/baseIsTypedArray.ts

Helpful TS utilities without dependencies

/** `Object#toString` result references. */
import { isObjectLike } from '~/is/isObject'
import isLength from '~/is/isLength'
import type { TagType } from './baseGetTag'
import baseGetTag from './baseGetTag'

const argumentsTag = '[object Arguments]',
  arrayTag = '[object Array]',
  boolTag = '[object Boolean]',
  dateTag = '[object Date]',
  errorTag = '[object Error]',
  funcTag = '[object Function]',
  mapTag = '[object Map]',
  numberTag = '[object Number]',
  objectTag = '[object Object]',
  regexpTag = '[object RegExp]',
  setTag = '[object Set]',
  stringTag = '[object String]',
  weakMapTag = '[object WeakMap]'

const arrayBufferTag = '[object ArrayBuffer]',
  dataViewTag = '[object DataView]',
  float32Tag = '[object Float32Array]',
  float64Tag = '[object Float64Array]',
  int8Tag = '[object Int8Array]',
  int16Tag = '[object Int16Array]',
  int32Tag = '[object Int32Array]',
  uint8Tag = '[object Uint8Array]',
  uint8ClampedTag = '[object Uint8ClampedArray]',
  uint16Tag = '[object Uint16Array]',
  uint32Tag = '[object Uint32Array]'

/** Used to identify `toStringTag` values of typed arrays. */
const typedArrayTags = <Record<TagType | string, boolean>>{}

typedArrayTags[float32Tag] =
  typedArrayTags[float64Tag] =
  typedArrayTags[int8Tag] =
  typedArrayTags[int16Tag] =
  typedArrayTags[int32Tag] =
  typedArrayTags[uint8Tag] =
  typedArrayTags[uint8ClampedTag] =
  typedArrayTags[uint16Tag] =
  typedArrayTags[uint32Tag] =
    true

typedArrayTags[argumentsTag] =
  typedArrayTags[arrayTag] =
  typedArrayTags[arrayBufferTag] =
  typedArrayTags[boolTag] =
  typedArrayTags[dataViewTag] =
  typedArrayTags[dateTag] =
  typedArrayTags[errorTag] =
  typedArrayTags[funcTag] =
  typedArrayTags[mapTag] =
  typedArrayTags[numberTag] =
  typedArrayTags[objectTag] =
  typedArrayTags[regexpTag] =
  typedArrayTags[setTag] =
  typedArrayTags[stringTag] =
  typedArrayTags[weakMapTag] =
    false

/**
 * The base implementation of `isTypedArray` without Node.js optimizations.
 *
 * @private
 */
export default function baseIsTypedArray(value: any): boolean {
  return isObjectLike(value) && isLength(value.length) && typedArrayTags[baseGetTag(value)]
}