@feugene/mu/src/to/toString.ts

Helpful TS utilities without dependencies

import isSymbol from '~/is/isSymbol'
import { reTrim } from '~/core/vars'

const symbolProto = Symbol ? Symbol.prototype : undefined,
  symbolToString = symbolProto ? symbolProto.toString : undefined
/**
 * Converts `value` to a string if it's not one. An empty string is returned
 * for `null` and `undefined` values. The sign of `-0` is preserved.
 */
export default function toString(value: any): string {
  if (Array.isArray(value)) {
    return value.toString()
  }

  if (isSymbol(value)) {
    return symbolToString ? symbolToString.call(value) : ''
  }

  switch (typeof value) {
    case 'string':
      return value.replace(reTrim, '')
    case 'number':
      return value.toString()
    case 'object':
      return value === null ? '' : JSON.stringify(value)
    case 'boolean':
      return value.toString()
  }

  if (!value) {
    return ''
  }

  const result = value + ''

  return result === '0' && 1 / value === -Infinity ? '-0' : result
}