@saeris/graphql-scalars/dist-src/phoneNumber.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: ${value}`).matches(/^\+\d{11,15}$/i, `Value is not a valid phone number of the form +17895551234 (10-15 digits): ${value}`).validateSync(value);

export const PhoneNumberScalar = `scalar PhoneNumber`;
export const PhoneNumber = new GraphQLScalarType({
  name: `PhoneNumber`,
  description: `A field whose value conforms to the standard E.164 format as specified in: https://en.wikipedia.org/wiki/E.164. Basically this is +17895551234.`,

  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 phone numbers but got a: ${ast.kind}`);
    }

    return validate(ast.value);
  }

});