feat: add node LCOV support and generated integration fixtures

.github/workflows/release.yml

@@ -46,16 +46,16 @@ jobs:
 
             - name: Commit built artifact
               run: |
-                if git diff --quiet lib/index.js; then
-                    echo "No changes to lib/index.js"
-                    exit 0
-                fi
-                
-                git config user.name "github-actions[bot]"
-                git config user.email "github-actions[bot]@users.noreply.github.com"
-                git add lib/index.js
-                git commit -m "build: update lib/index.js"
-                git push origin master
+                  if git diff --quiet lib/index.js; then
+                      echo "No changes to lib/index.js"
+                      exit 0
+                  fi
+
+                  git config user.name "github-actions[bot]"
+                  git config user.email "github-actions[bot]@users.noreply.github.com"
+                  git add lib/index.js
+                  git commit -m "build: update lib/index.js"
+                  git push origin master
 
     release-please:
         name: Release Please

README.md

@@ -21,7 +21,7 @@ multiple languages, and shows meaningful per-file diffs without external depende
 
 ## Features
 
-- Supports any LCOV-producing tool (Bun, Jest, c8, nyc, Istanbul, PHPUnit, …) and Go coverage
+- Supports any LCOV-producing tool (Bun, Node.js, Jest, c8, nyc, Istanbul, PHPUnit, …) and Go coverage
 - Shows per-file coverage deltas against base branch
 - Single sticky PR comment (updates existing, no spam)
 - Uses `@actions/cache` for cross-run comparison
@@ -118,6 +118,7 @@ by prefix match to find the latest base-branch snapshot.
 | Tool      | Format           | Example                   |
 | --------- | ---------------- | ------------------------- |
 | `bun`     | LCOV             | `bun:coverage/lcov.info`  |
+| `node`    | LCOV             | `node:coverage/lcov.info` |
 | `lcov`    | LCOV (generic)   | `lcov:coverage/lcov.info` |
 | `go`      | Go cover profile | `go:coverage.out`         |
 | `gocover` | Go cover profile | `gocover:coverage.out`    |
@@ -136,6 +137,12 @@ by prefix match to find the latest base-branch snapshot.
 # Bun (produces LCOV)
 bun test --coverage --coverage-reporter=lcov
 
+# Node.js (produces LCOV)
+node --test \
+  --experimental-test-coverage \
+  --test-reporter=lcov --test-reporter-destination=coverage/lcov.info \
+  --test-reporter=spec --test-reporter-destination=stdout
+
 # Go
 go test -coverprofile=coverage.out ./...
 ```
@@ -151,6 +158,8 @@ bun run build  # bundle to lib/index.mjs
 
 ## Related
 
-- [actions/cache](https://github.com/actions/cache)
+- [@actions/cache](https://github.com/actions/cache)
+- [@actions/core](https://github.com/actions/core)
+- [@actions/github](https://github.com/actions/github)
 - [Bun test coverage](https://bun.sh/docs/cli/test#coverage)
 - [Go test coverage](https://go.dev/blog/cover)

action.yml

@@ -1,5 +1,5 @@
 name: "Coverage"
-description: "Parse Bun (LCOV) and Go coverage, compute per-file deltas, and post a sticky PR comment with monospace coverage output."
+description: "Parse LCOV (Bun, Node.js, Jest, etc.) and Go coverage, compute per-file deltas, and post a sticky PR comment with monospace coverage output."
 author: "xseman"
 
 branding:
@@ -10,7 +10,7 @@ inputs:
     coverage-artifact-paths:
         description: >
             Newline- or comma-separated list of coverage artifact paths.
-            Each entry is `<tool>:<path>`, e.g. `bun:coverage/lcov.info` or `go:coverage.out`.
+            Each entry is `<tool>:<path>`, e.g. `bun:coverage/lcov.info`, `node:coverage/lcov.info`, or `go:coverage.out`.
         required: true
     pull-request-number:
         description: >