graphql-scalars/dist/esnext/resolvers/ISBN.js

A collection of scalar types not included in base GraphQL.

import { GraphQLScalarType } from 'graphql/type/definition';
import { GraphQLError } from 'graphql/error';
import { Kind } from 'graphql/language';
const ISBN_REGEX_ARR = [
    /^(?:ISBN(?:-10)?:? *((?=\d{1,5}([ -]?)\d{1,7}\2?\d{1,6}\2?\d)(?:\d\2*){9}[\dX]))$/i,
    /^(?:ISBN(?:-13)?:? *(97(?:8|9)([ -]?)(?=\d{1,5}\2?\d{1,7}\2?\d{1,6}\2?\d)(?:\d\2*){9}\d))$/i
];
const validate = (value) => {
    if (typeof value !== 'string') {
        throw new TypeError(`Value is not string: ${value}`);
    }
    let valid = false;
    for (const regex of ISBN_REGEX_ARR) {
        if (regex.test(value)) {
            valid = true;
            break;
        }
    }
    if (!valid) {
        throw new TypeError(`Value is not a valid ISBN number: ${value}`);
    }
    return value;
};
export default 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);
    }
});
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