flow-typer-js/dist/types/literals.js

Declarative static and runtime type checking with Flow

//      
import { validatorError } from '../error.js'
import { isBoolean, isNumber, isString } from '../is.js'
import { EMPTY_VALUE } from '../const.js'

                                                     

export const literalOf =
                   (primitive   )                   => {
    function literal (value       , _scope         = '')    {
      if (value === EMPTY_VALUE || (value === primitive)) return primitive
      throw validatorError(literal, value, _scope)
    }
    literal.type = () => {
      if (isBoolean(primitive)) return `${primitive ? 'true': 'false'}`
      else return `"${primitive}"`
    }
    return literal
  }