From f8413405b6986a5adf3ed51a02535e0ab9c70307 Mon Sep 17 00:00:00 2001
From: Bede Constantinides <bedeabc@gmail.com>
Date: Fri, 23 Oct 2026 16:15:45 +0100
Subject: [PATCH] Test wasm32 with and without simd128 in CI

Make packed-seq's rand dev-only so builds work for
wasm32-unknown-unknown as well as wasi target.
---
 .github/workflows/rust.yml | 16 ++++++++++++++++
 Cargo.toml                 |  3 ++-
 scripts/wasi-node.mjs      | 25 +++++++++++++++++++++++++
 3 files changed, 43 insertions(+), 1 deletion(-)
 create mode 100644 scripts/wasi-node.mjs

diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index ead6b4b..784ab7f 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -27,3 +27,19 @@ jobs:
         run: cargo build --verbose
       - name: Run tests
         run: cargo test --verbose
+
+  test-wasm:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        simd128: ["-simd128", "+simd128"]
+    env:
+      RUSTFLAGS: -C target-feature=${{ matrix.simd128 }}
+      CARGO_TARGET_WASM32_WASIP1_RUNNER: node --no-warnings scripts/wasi-node.mjs
+    steps:
+      - uses: actions/checkout@v4
+      - run: rustup target add wasm32-wasip1 wasm32-unknown-unknown
+      - name: Check wasm32-unknown-unknown
+        run: cargo check --verbose --release --lib --features scalar --target wasm32-unknown-unknown
+      - name: Run release tests
+        run: cargo test --verbose --release --features scalar --target wasm32-wasip1
diff --git a/Cargo.toml b/Cargo.toml
index d74e763..0461e1a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,10 +10,11 @@ authors = ["Ragnar Groot Koerkamp", "Igor Martayan"]
 description = "A SIMD-accelerated library to compute hashes of DNA sequences"
 
 [dependencies]
-packed-seq = "5.0"
+packed-seq = { version = "5.0", default-features = false }
 
 [dev-dependencies]
 itertools = "0.15"
+packed-seq = { version = "5.0", features = ["rand"] }
 rand = "0.10"
 
 [features]
diff --git a/scripts/wasi-node.mjs b/scripts/wasi-node.mjs
new file mode 100644
index 0000000..1e9e6fb
--- /dev/null
+++ b/scripts/wasi-node.mjs
@@ -0,0 +1,25 @@
+// Run a wasm32-wasip1 binary under Node's V8 engine, for use as a cargo runner:
+//
+//   CARGO_TARGET_WASM32_WASIP1_RUNNER="node --no-warnings scripts/wasi-node.mjs" \
+//   RUSTFLAGS="-C target-feature=+simd128" \
+//   cargo test --release --features scalar --target wasm32-wasip1
+import { readFile } from 'node:fs/promises';
+import process from 'node:process';
+import { WASI } from 'node:wasi';
+
+const [wasmPath, ...args] = process.argv.slice(2);
+if (!wasmPath) {
+  console.error('usage: node wasi-node.mjs <file.wasm> [args...]');
+  process.exit(2);
+}
+
+const wasi = new WASI({
+  version: 'preview1',
+  args: [wasmPath, ...args],
+  env: process.env,
+  returnOnExit: true,
+});
+
+const module = await WebAssembly.compile(await readFile(wasmPath));
+const instance = await WebAssembly.instantiate(module, wasi.getImportObject());
+process.exitCode = wasi.start(instance);