Tsify-next

Tsify-next is a library for generating TypeScript definitions from Rust code. The original Tsify appears to be in hypernation mode, so this for incorporates updates until main Tsify project comes back to life.

Using this with wasm-bindgen will automatically output the types to .d.ts.

Inspired by typescript-definitions and ts-rs.

Example

Click to show Cargo.toml.

[dependencies]
tsify = "0.4.5"
serde = { version = "1.0", features = ["derive"] }
wasm-bindgen = { version = "0.2" }

use serde::{Deserialize, Serialize};
use tsify::Tsify;
use wasm_bindgen::prelude::*;

#[derive(Tsify, Serialize, Deserialize)]
#[tsify(into_wasm_abi, from_wasm_abi)]
pub struct Point {
    x: i32,
    y: i32,
}

#[wasm_bindgen]
pub fn into_js() -> Point {
    Point { x: 0, y: 0 }
}

#[wasm_bindgen]
pub fn from_js(point: Point) {}

Will generate the following .d.ts file:

/* tslint:disable */
/* eslint-disable */
/**
 * @returns {Point}
 */
export function into_js(): Point;
/**
 * @param {Point} point
 */
export function from_js(point: Point): void;
export interface Point {
  x: number;
  y: number;
}

This is the behavior due to typescript_custom_section and Rust Type conversions.

Crate Features

• json (default) enables serialization through serde_json.
• js enables serialization through serde-wasm-bindgen and generates the appropriate types for it. This will be the default in future versions.

Attributes

Tsify container attributes

• into_wasm_abi implements IntoWasmAbi and OptionIntoWasmAbi. This can be converted directly from Rust to JS via serde_json or serde-wasm-bindgen.
• from_wasm_abi implements FromWasmAbi and OptionFromWasmAbi. This is the opposite operation of the above.
• namespace generates a namespace for the enum variants.

Tsify field attributes

• type
• optional

Serde attributes

• rename
• rename-all
• tag
• content
• untagged
• skip
• skip_serializing
• skip_deserializing
• skip_serializing_if = "Option::is_none"
• flatten
• default
• transparent

Type Override

use tsify::Tsify;

#[derive(Tsify)]
pub struct Foo {
    #[tsify(type = "0 | 1 | 2")]
    x: i32,
}

Generated type:

export interface Foo {
  x: 0 | 1 | 2;
}

Optional Properties

#[derive(Tsify)]
struct Optional {
    #[tsify(optional)]
    a: Option<i32>,
    #[serde(skip_serializing_if = "Option::is_none")]
    b: Option<String>,
    #[serde(default)]
    c: i32,
}

Generated type:

export interface Optional {
  a?: number;
  b?: string;
  c?: number;
}

Enum

#[derive(Tsify)]
enum Color {
    Red,
    Blue,
    Green,
    Rgb(u8, u8, u8),
    Hsv {
        hue: f64,
        saturation: f64,
        value: f64,
    },
}

Generated type:

export type Color =
  | "Red"
  | "Blue"
  | "Green"
  | { Rgb: [number, number, number] }
  | { Hsv: { hue: number; saturation: number; value: number } };

Enum with namespace

#[derive(Tsify)]
#[tsify(namespace)]
enum Color {
    Red,
    Blue,
    Green,
    Rgb(u8, u8, u8),
    Hsv {
        hue: f64,
        saturation: f64,
        value: f64,
    },
}

Generated type:

declare namespace Color {
  export type Red = "Red";
  export type Blue = "Blue";
  export type Green = "Green";
  export type Rgb = { Rgb: [number, number, number] };
  export type Hsv = { Hsv: { hue: number; saturation: number; value: number } };
}

export type Color =
  | "Red"
  | "Blue"
  | "Green"
  | { Rgb: [number, number, number] }
  | { Hsv: { hue: number; saturation: number; value: number } };

Type Aliases

use tsify::{declare, Tsify};

#[derive(Tsify)]
struct Foo<T>(T);

#[declare]
type Bar = Foo<i32>;

Generated type:

export type Foo<T> = T;
export type Bar = Foo<number>;