@saeris/graphql-scalars/dist-src/hexadecimal.js

A collection of scalar types using Joi for validation

import { GraphQLScalarType, GraphQLError, Kind } from "graphql";
import { string as yupString } from "yup";

const validate = value => yupString().strict(true).typeError(`Value is not string: ${value}`).matches(/^[a-f0-9]+$/i, `Value is not a valid hexadecimal value: ${value}`).validateSync(value);

export const HexadecimalScalar = `scalar Hexadecimal`;
export const Hexadecimal = new GraphQLScalarType({
  name: `Hexadecimal`,
  description: `A field whose value is a hexadecimal: https://en.wikipedia.org/wiki/Hexadecimal.`,

  serialize(value) {
    return validate(value);
  },

  parseValue(value) {
    return validate(value);
  },

  parseLiteral(ast) {
    if (ast.kind !== Kind.STRING) {
      throw new GraphQLError(`Can only validate strings as a hexadecimal but got a: ${ast.kind}`);
    }

    return validate(ast.value);
  }

});