@saeris/graphql-scalars/dist-src/isbn.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}`).test(`isbn`, `Value is not a valid ISBN number: ${value}`, val => {
  const isbn10 = /^(?:ISBN(?:-10)?:? *((?=\d{1,5}([ -]?)\d{1,7}\2?\d{1,6}\2?\d)(?:\d\2*){9}[\dX]))$/i;
  const isbn13 = /^(?:ISBN(?:-13)?:? *(97(?:8|9)([ -]?)(?=\d{1,5}\2?\d{1,7}\2?\d{1,6}\2?\d)(?:\d\2*){9}\d))$/i;
  return !(!isbn10.test(val) && !isbn13.test(val));
}).validateSync(value);

export const ISBNScalar = `scalar ISBN`;
export const ISBN = new GraphQLScalarType({
  name: `ISBN`,
  description: `A field whose value is a ISBN-10 or ISBN-13 number: https://en.wikipedia.org/wiki/International_Standard_Book_Number.`,

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

    return validate(ast.value);
  }

});