@jokio/graphql/src/modules/scalars/datetime/date/index.ts

High level, pre-configured, GraphQL Server

// @flow
/**
 * Copyright (c) 2017, Dirk-Jan Rutten
 * All rights reserved.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 */

import { GraphQLScalarType } from 'graphql';
import { GraphQLScalarTypeConfig } from "graphql";// eslint-disable-line
import { Kind } from 'graphql/language'
import { validateDate, validateJSDate, serializeDate, parseDate } from '../utils'

/**
 * An RFC 3339 compliant date scalar.
 *
 * Input:
 *    This scalar takes an RFC 3339 date string as input and
 *    parses it to a javascript Date.
 *
 * Output:
 *    This scalar serializes javascript Dates and
 *    RFC 3339 date strings to RFC 3339 date strings.
 */
const config: GraphQLScalarTypeConfig<Date, string> = {
	name: 'Date',
	description: 'A date string, such as 2007-12-03, compliant with the `full-date` ' +
	'format outlined in section 5.6 of the RFC 3339 profile of the ' +
	'ISO 8601 standard for representation of dates and times using ' +
	'the Gregorian calendar.',
	serialize(value: any): any {
		if (value instanceof Date) {
			if (validateJSDate(value)) {
				return serializeDate(value)
			}
			throw new TypeError('Date cannot represent an invalid Date instance')
		} else if (typeof value === 'string' || value instanceof String) {
			if (validateDate(value)) {
				return value
			}
			throw new TypeError(
				`Date cannot represent an invalid date-string ${value}.`
			)
		} else {
			throw new TypeError(
				'Date cannot represent a non string, or non Date type ' +
				JSON.stringify(value)
			)
		}
	},
	parseValue(value) {
		if (!(typeof value === 'string' || value instanceof String)) {
			throw new TypeError(
				`Date cannot represent non string type ${JSON.stringify(value)}`
			)
		}

		if (validateDate(value)) {
			return parseDate(value)
		}
		throw new TypeError(
			`Date cannot represent an invalid date-string ${value}.`
		)
	},
	parseLiteral(ast) {
		if (ast.kind === Kind.STRING) {
			if (validateDate(ast.value)) {
				return parseDate(ast.value)
			}
		}
		return null
	}
}

export default new GraphQLScalarType(config)