65 lines
1.6 KiB
JavaScript
65 lines
1.6 KiB
JavaScript
const { GraphQLScalarType } = require('graphql');
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const { GraphQLError } = require('graphql/error')
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const { Kind } = require('graphql/language');
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module.exports = new GraphQLScalarType({
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name: 'DateTime',
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description: 'Use JavaScript Date object for date/time fields.',
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serialize(value) {
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let v = value;
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if (!(v instanceof Date) && typeof v !== 'string' && typeof v !== 'number') {
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throw new TypeError(
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`Value is not an instance of Date, Date string or number: ${v}`,
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);
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}
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if (typeof v === 'string') {
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v = new Date();
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v.setTime(Date.parse(value));
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} else if (typeof v === 'number') {
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v = new Date(v);
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}
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if (Number.isNaN(v.getTime())) {
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throw new TypeError(`Value is not a valid Date: ${v}`);
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}
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return v.toJSON();
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},
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parseValue(value) {
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const date = new Date(value);
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if (Number.isNaN(date.getTime())) {
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throw new TypeError(`Value is not a valid Date: ${value}`);
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}
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return date;
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},
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parseLiteral(ast) {
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if (ast.kind !== Kind.STRING && ast.kind !== Kind.INT) {
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throw new GraphQLError(
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`Can only parse strings & integers to dates but got a: ${ast.kind}`,
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);
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}
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const result = new Date(ast.kind === Kind.INT ? Number(ast.value) : ast.value);
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if (Number.isNaN(result.getTime())) {
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throw new GraphQLError(`Value is not a valid Date: ${ast.value}`);
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}
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if (ast.kind === Kind.STRING && ast.value !== result.toJSON()) {
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throw new GraphQLError(
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`Value is not a valid Date format (YYYY-MM-DDTHH:MM:SS.SSSZ): ${
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ast.value
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}`,
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);
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}
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return result;
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},
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}); |