wasmbuild

A tiny build tool to generate wasm-bindgen glue for Deno.

Setup

Add a build task to the deno.json file in your project:

{
  "tasks": {
    "build": "deno run --unstable -A https://deno.land/x/wasmbuild@VERSION_GOES_HERE/main.ts"
  }
}

Usage

Now invoke deno task build in your project’s root.

$ deno task build

Bindings will be generated at ./lib/<crate-name>.generated.js:

import { instantiate } from "./lib/deno_test.generated.js";

const { greet } = await instantiate();
greet("Deno");

Or instantiate and use the exports:

import { greet, instantiate } from "./lib/deno_test.generated.js";

await instantiate();
greet("Deno");

CLI Flags

• --debug - Build without optimizations.
• --project <crate_name> / -p <crate_name> - Specifies the crate to build when using a Cargo workspace.
• --out <dir_path> - Specifies the output directory. Defaults to ./lib
• --js-ext <ext_no_period> - Extension to use for the wasm bindgen JS file. Defaults to js.
• --all-features - Build the crate with all features.
• --no-default-features - Build the crate with no default features.
• --features - Specify the features to create. Specify multiple features quoted and with spaces (ex. --features "wasm serialization").
• --sync - Generate a synchronous module that stores the Wasm module inline as base64 text.
• --check - Checks to ensure the output is up to date.
  • This is useful to run on the CI in order to ensure the wasmbuild output is up to date.