graphql-scalars/dist/esnext/RegularExpression.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';
export default class RegularExpression extends GraphQLScalarType {
    constructor(name, regex, options = {}) {
        const REGEX = new RegExp(regex);
        const errorMessage = options.errorMessage
            ? options.errorMessage
            : (r, v) => `Value does not match the regular expression ${r}: ${v}`;
        super({
            name,
            description: `A field whose value matches the provided regular expression ${regex}.`,
            serialize(value) {
                if (typeof value !== 'string') {
                    throw new TypeError(`Value is not string: ${value}`);
                }
                if (!REGEX.test(value)) {
                    throw new TypeError(errorMessage(regex, value));
                }
                return value;
            },
            parseValue(value) {
                if (typeof value !== 'string') {
                    throw new TypeError(`Value is not string: ${value}`);
                }
                if (!REGEX.test(value)) {
                    throw new TypeError(errorMessage(regex, value));
                }
                return value;
            },
            parseLiteral(ast) {
                if (ast.kind !== Kind.STRING) {
                    throw new GraphQLError(`Can only validate strings as regular expressions but got a: ${ast.kind}`);
                }
                if (!REGEX.test(ast.value)) {
                    throw new TypeError(errorMessage(regex, ast.value));
                }
                return ast.value;
            },
        });
    }
}
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