wasm-server-runner

Allows you to run programs in the browser using web assembly using a simple cargo run.

Usage

Step 1.

rustup target add wasm32-unknown-unknown
cargo install wasm-server-runner

Step 2.

Add this to your ~/.cargo/config.toml (not the Cargo.toml of your project!):

[target.wasm32-unknown-unknown]
runner = "wasm-server-runner"

Step 3.

Run programs in the browser using

cargo run --target wasm32-unknown-unknown
cargo run --target wasm32-unknown-unknown --example example

wasm-server-runner path/to/file.wasm

Example output:

INFO wasm_server_runner: wasm output is 49.79kb large
INFO wasm_server_runner: starting webserver at http://127.0.0.1:1334

The website will reload when the server is restarted and serve files relative to the current directory.

Configuration options

All configuration options can be specified via environment variables.

WASM_SERVER_RUNNER_ADDRESS

Default: 127.0.0.1 Control the address that the server listens on. Set to 0.0.0.0 to allow access from anywhere.

WASM_SERVER_RUNNER_DIRECTORY

Default: .

Can be used to specify where relative path requests are loaded from.

WASM_SERVER_RUNNER_CUSTOM_INDEX_HTML

Default: none

When set, will try to load the custom index.html from that path instead of the default. Can be relative to the directory.

Note: To support both module and non-module style the index.html needs to have specific string that will be replaced at runtime. The body should contain something like

{{ NO_MODULE }}
<script type="module">
    // {{ MODULE }}
</script>

WASM_SERVER_RUNNER_HTTPS

Default: false

Controls whether https is used.

WASM_SERVER_RUNNER_NO_MODULE

Default: false

Controls whether the wasm-bindgen output uses modules or not.