A WebAssembly plugin for Typst

build.zig

const std = @import("std");

pub fn build(b: *std.Build) void {
    const target = b.resolveTargetQuery(.{
        .cpu_arch = .wasm32,
        .os_tag = .freestanding,
    });

    const hello = b.addExecutable(.{
        .name = "hello",
        .root_source_file = b.path("hello.zig"),
        .target = target,
        .optimize = .ReleaseSmall,
        .strip = true,
    });

    hello.entry = .disabled;
    hello.rdynamic = true;

    b.installArtifact(hello);
}

hello.typ

#set page(width: 10cm, height: 10cm)
#set text(font: "Inter")

== A WebAssembly plugin for Typst

#line(length: 100%)

#emph[Typst is capable of interfacing with plugins compiled to WebAssembly.]

#line(length: 100%)

#let wasm = plugin("zig-out/bin/hello.wasm")
#let resp = str(wasm.hello())

#eval(resp, mode: "markup")

hello.zig

const std = @import("std");
const allocator = std.heap.page_allocator;

export fn hello() i32 {
    const message = "*Hello* from `hello.wasm` written in Zig!";

    wasm_minimal_protocol_send_result_to_host(message.ptr, message.len);

    return 0;
}

// ===
// Functions for the protocol

extern "typst_env" fn wasm_minimal_protocol_send_result_to_host(ptr: [*]const u8, len: usize) void;
extern "typst_env" fn wasm_minimal_protocol_write_args_to_buffer(ptr: [*]u8) void;

Note

Typst is a new markup-based typesetting system that is designed to be as powerful as LaTeX while being much easier to learn and use.

Links

• https://typst.app
• https://github.com/typst/typst