Stryker Adapter

Quell's Stryker adapter reads from Stryker's JSON mutation report. This lets you use Quell with JavaScript and TypeScript projects that use Stryker for mutation testing.

Setup

# Install Stryker (example: JavaScript)
npm install --save-dev @stryker-mutator/core

# Run Stryker
npx stryker run

Stryker writes its report to reports/mutation/mutation.json by default.

Use Quell with Stryker

quell scan --tool stryker
quell fix --tool stryker
quell ci --tool stryker

Custom report path

If your Stryker report is in a non-default location:

# Override via environment variable
export QUELL_STRYKER_REPORT=custom/path/mutation.json

quell scan --tool stryker

Report format

Quell expects Stryker's standard JSON report format:

{
  "files": {
    "src/payments.js": {
      "mutants": [
        {
          "id": "1",
          "status": "Survived",
          "location": { "start": {"line": 20, "column": 5} },
          "mutatorName": "BoundaryMutation",
          "original": "amount > 0",
          "replacement": "amount >= 0"
        }
      ]
    }
  }
}

Quell maps Stryker's mutatorName values to its internal MutationOperator enum.

Stryker → Quell operator mapping

Stryker configuration

{
  "testRunner": "jest",
  "reporters": ["html", "json"],
  "jsonReporter": {
    "fileName": "reports/mutation/mutation.json"
  }
}