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    worked for me, but just for knowing types!!, custom types have to use instanceof Commented May 17, 2019 at 16:38
  • 4
    You'll need to import util to access these functions (e.g., import { isString } from 'util'; Commented Aug 16, 2019 at 23:47
  • 5
    Depricated now , use if (typeof value === 'string') instead Commented Apr 30, 2020 at 11:20