ddidderr
516c780f84
Ghostty's wasm code talks to JavaScript through the zig-js library (mitchellh/zig-js, pinned in build.zig.zon). The first port invented its own import ABI because the dependency wasn't available; now: - ghostty-os/src/wasm/js.rs is a Rust port of zig-js's Zig side (Ref, Value, Object get/set/call/new, global, runtime, string) using its "zig-js" import module, function names and NaN-boxed value refs. - web_canvas face and the atlas debug canvas make the same JS calls as Ghostty's Zig code. - zig-js's unmodified JS host (+ LICENSE) is vendored under crates/ghostty-wasm/js/zig-js and drives the node test. Test Plan: - cargo test -p ghostty-wasm (node >= 24; asserts zig-js imports and no leaked host values)
79 lines
2.6 KiB
Rust
79 lines
2.6 KiB
Rust
//! Builds the wasm module and runs `tests/node_test.js` against it with
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//! node, with zig-js's own JS host and a fake `document`/canvas. Skipped when
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//! node or the `wasm32-unknown-unknown` target is not available.
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use std::{path::PathBuf, process::Command};
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#[test]
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fn wasm_module_runs_under_node() {
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// zig-js's host is TypeScript; node must be able to strip types (>= 23.6).
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let Some(major) = Command::new("node")
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.arg("--version")
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.output()
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.ok()
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.and_then(|o| {
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String::from_utf8_lossy(&o.stdout)
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.trim()
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.trim_start_matches('v')
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.split('.')
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.next()?
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.parse::<u32>()
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.ok()
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})
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else {
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eprintln!("skipping: node not found");
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return;
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};
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if major < 24 {
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eprintln!("skipping: node {major} cannot load the zig-js TypeScript host");
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return;
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}
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let manifest = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
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let target_dir = std::env::var_os("CARGO_TARGET_DIR")
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.map_or_else(|| manifest.join("../../target"), PathBuf::from);
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// A separate directory so this does not contend with the outer build.
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let target_dir = target_dir.join("wasm-test");
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let cargo = std::env::var("CARGO").unwrap_or_else(|_| "cargo".to_owned());
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let out = Command::new(cargo)
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.args([
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"build",
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"--target",
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"wasm32-unknown-unknown",
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"-p",
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"ghostty-wasm",
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"--manifest-path",
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])
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.arg(manifest.join("Cargo.toml"))
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.env("CARGO_TARGET_DIR", &target_dir)
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.output()
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.expect("run cargo");
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if !out.status.success() {
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let stderr = String::from_utf8_lossy(&out.stderr);
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if stderr.contains("can't find crate for `std`")
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|| stderr.contains("target may not be installed")
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{
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eprintln!("skipping: wasm32-unknown-unknown target not installed");
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return;
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}
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panic!("wasm build failed:\n{stderr}");
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}
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let wasm = target_dir.join("wasm32-unknown-unknown/debug/ghostty_wasm.wasm");
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assert!(wasm.exists(), "missing {}", wasm.display());
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let out = Command::new("node")
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.arg(manifest.join("tests/node_test.js"))
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.arg(&wasm)
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.output()
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.expect("run node");
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assert!(
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out.status.success(),
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"node test failed:\nstdout: {}\nstderr: {}",
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String::from_utf8_lossy(&out.stdout),
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String::from_utf8_lossy(&out.stderr)
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);
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assert!(String::from_utf8_lossy(&out.stdout).contains("ok"));
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}
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