AS-Covers transform

AssemblyScript compiler transform that instruments source code with as-covers declarations and execution calls.

Most users can install @as-covers/core instead; it depends on this package. Install @as-covers/transform directly when you manage the packages separately.

Install

npm install --save-dev @as-covers/transform @as-covers/assembly assemblyscript

assemblyscript is a peer dependency because the transform runs inside the AssemblyScript compiler.

Compile with coverage

npx asc ./assembly/index.ts \
  --lib ./node_modules/@as-covers/assembly/index.ts \
  --transform ./node_modules/@as-covers/transform/lib/index.js \
  --outFile ./build/coverage.wasm \
  --exportStart _start

Replace ./assembly/index.ts with your test entry file. The --lib path makes the injected __cover imports type-check, and the --transform path points at this package's built lib/index.js output.

Run the instrumented wasm

Use @as-covers/glue or the @as-covers/core re-export to install imports, register the loader, run _start, and render a report.

Verified package flow

The repository package smoke test packs this transform and compiles tests/test.ts with the packed tarball:

npm run test:package

License

MIT. See LICENSE.