Draft: Support date types

[LuminaSapphira]

This is the initial pass at supporting DateTime types in Typeshare. The basic gist is to map a chrono::DateTime type to a language-relevant type. Additionally, it will emit serializers for DateTime types if they are used.

Closes #34

Todo

• Update existing snapshot tests reflecting the changes
• Add appropriate unit and snapshot tests

Types used

Language	Type
Kotlin	java.time.Instant
Swift	Date (Foundation)
TypeScript	Date (JS Global)
Go	time.Time

Sample Input Rust Code

use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use typeshare::typeshare;

#[derive(Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
#[typeshare]
pub struct DateTimeTest {
    pub test: DateTime<Utc>,
    pub uwu: u16,
    pub iwi: i16,
}

Example output

Kotlin

typeshare typeshare-tests/src --lang kotlin --output-file typeshare-tests/typeshare-output/test_def.kt

@Serializable
data class DateTimeTest (
	var test: java.time.Instant,
	var uwu: UShort,
	var iwi: Short
)

// Emits serializer at end of file

import kotlinx.serialization.*

object JavaInstantSerializer : KSerializer<java.time.Instant> {
    override val descriptor = PrimitiveDescriptor("Instant", PrimitiveKind.STRING)
    override fun serialize(encoder: Encoder, value: java.time.Instant) = encoder.encodeString(value)
    override fun deserialize(decoder: Decoder): java.time.Instant = java.time.Instant.parse(decoder.decodeString())
}

Swift

/*
 Generated by typeshare 1.0.0
 */

import Foundation

public struct DateTimeTest: Codable {
	public let test: Date /* Foundation's Date is already Codable */
	public let uwu: UInt16
	public let iwi: Int16

	public init(test: Date, uwu: UInt16, iwi: Int16) {
		self.test = test
		self.uwu = uwu
		self.iwi = iwi
	}
}

Typescript

/*
 Generated by typeshare 1.0.0
*/

export interface DateTimeTest {
	test: Date;
	uwu: number;
	iwi: number;
}

// Can be passed to JSON.parse(str, reviver) to marshal the ISO 8601 date string into a Date object
// JSON.stringify will emit a string in the right format by default
export function TypeshareDateReviver(key, value): Date { return new Date(value); }

Go

I have the least experience in Go, and am unsure if extra serializers are needed here.

// Code generated by typeshare 1.0.0. DO NOT EDIT.
package test

import (
    "encoding/json"
    "time"
)

type DateTimeTest struct {
	Test Time `json:"test"`
	Uwu int `json:"uwu"`
	Iwi int `json:"iwi"`
}

[LuminaSapphira]

Closing in favor of #85