graphql-scalars/dist/esnext/resolvers/DateTime.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 new GraphQLScalarType({
    name: 'DateTime',
    description: 'Use JavaScript Date object for date/time fields.',
    serialize(value) {
        let v = value;
        if (!(v instanceof Date) && typeof v !== 'string' && typeof v !== 'number') {
            throw new TypeError(`Value is not an instance of Date, Date string or number: ${JSON.stringify(v)}`);
        }
        if (typeof v === 'string') {
            v = new Date();
            v.setTime(Date.parse(value));
        }
        else if (typeof v === 'number') {
            v = new Date(v);
        }
        // eslint-disable-next-line no-restricted-globals
        if (Number.isNaN(v.getTime())) {
            throw new TypeError(`Value is not a valid Date: ${JSON.stringify(v)}`);
        }
        return v.toJSON();
    },
    parseValue(value) {
        const date = new Date(value);
        // eslint-disable-next-line no-restricted-globals
        if (Number.isNaN(date.getTime())) {
            throw new TypeError(`Value is not a valid Date: ${value}`);
        }
        return date;
    },
    parseLiteral(ast) {
        if (ast.kind !== Kind.STRING && ast.kind !== Kind.INT) {
            throw new GraphQLError(`Can only parse strings & integers to dates but got a: ${ast.kind}`);
        }
        const result = new Date(ast.kind === Kind.INT ? Number(ast.value) : ast.value);
        // eslint-disable-next-line no-restricted-globals
        if (Number.isNaN(result.getTime())) {
            throw new GraphQLError(`Value is not a valid Date: ${ast.value}`);
        }
        if (ast.kind === Kind.STRING && ast.value !== result.toJSON()) {
            throw new GraphQLError(`Value is not a valid Date format (YYYY-MM-DDTHH:MM:SS.SSSZ): ${ast.value}`);
        }
        return result;
    },
});
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