@saeris/graphql-scalars/dist-src/emailAddress.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}`).email(`Value is not a valid email address: ${value}`).validateSync(value);

export const EmailAddressScalar = `scalar EmailAddress`;
export const EmailAddress = new GraphQLScalarType({
  name: `EmailAddress`,
  description: `A field whose value conforms to the standard internet email address format as specified in RFC822: https://www.w3.org/Protocols/rfc822/.`,

  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 email addresses but got a: ${ast.kind}`);
    }

    return validate(ast.value);
  }

});