Configuration file for Stryker Mutator, the mutation testing framework for JavaScript and friends. See https://stryker-mutator.io. Json Format

allowConsoleColors - The 'allowConsoleColors' value indicates whether Stryker should use colors in console.

buildCommand - Configure a build command to run after mutating the code, but before mutants are tested. This is generally used to transpile your code before testing. Only configure this if your test runner doesn't take care of this already and you're not using just-in-time transpiler like `babel/register` or `ts-node`.

concurrency - Set the concurrency of workers. Stryker will always run checkers and test runners in parallel by creating worker processes (note, not `worker_threads`). This defaults to n-1 where n is the number of cpu's available on your machine. This is a sane default for most use cases.

maxTestRunnerReuse - Restart each forked threads after <n> runs. Not recommended unless you are experiencing memory leaks that you are unable to resolve. (default: 0)

checkers Enable checker plugins here. A checker plugin will be invoked for each mutant before it is run in a test runner. It can check to see of a given mutant is valid, by for example validate that it won't result in a type error

#	Values	Actions
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.commandRunner - CommandRunnerOptions

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commandRunner.command - The command to test each mutant. For example "npm run mocha". Defaults to "npm test".

coverageAnalysis - CoverageAnalysis

.clearTextReporter - ClearTextReporterOptions

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clearTextReporter.allowColor - Indicates whether or not to use color coding in output.

clearTextReporter.logTests - Indicates whether or not to log which tests were executed for a given mutant.

clearTextReporter.maxTestsToLog - Indicates the maximum amount of test to log when `logTests` is enabled

.dashboard - DashboardOptions

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dashboard.project - Indicates which project to use if the "dashboard" reporter is enabled.

dashboard.version - Indicates which version to use if the "dashboard" reporter is enabled.

dashboard.module - Indicates which module to use if the "dashboard" reporter is enabled.

dashboard.baseUrl - Indicates the base url of the stryker dashboard.

dashboard.reportType - ReportType

.eventReporter - EventRecorderOptions

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eventReporter.baseDir - The base dir to write the events to

fileLogLevel - LogLevel

logLevel - LogLevel

maxConcurrentTestRunners - [DEPRECATED please use "concurrency" instead]. Specifies the maximum number of concurrent test runners to spawn. Mutation testing is time consuming. By default, Stryker tries to make the most of your CPU's, by spawning as many test runners as you have CPU cores (`Number.MAX_SAFE_INTEGER`).

files With `files` you can choose which files should be included in your test runner sandbox. This is normally not needed as it defaults to all files not ignored by git. Try it out yourself with this command: `git ls-files --others --exclude-standard --cached --exclude .stryker-tmp`. If you do need to override `files` (for example: when your project does not live in a git repository), you can override the files here. When using the command line, the list can only contain a comma separated list of globbing expressions. When using the config file you can provide an array with `string`s

#	Values	Actions
{{$index+1}}.

mutate With mutate you configure the subset of files to use for mutation testing. Generally speaking, these should be your own source files.

#	Values	Actions
{{$index+1}}.

.mutator

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packageManager - The package manager Stryker can use to install missing dependencies.

mutator.excludedMutations excludedMutations

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plugins With 'plugins', you can add additional Node modules for Stryker to load (or require). By default, all node_modules starting with @stryker-mutator/* will be loaded, so you would normally not need to specify this option. These modules should be installed right next to stryker. For a current list of plugins, you can consult 'npm' or 'stryker-mutator.io.'

#	Values	Actions
{{$index+1}}.

appendPlugins A list of additional plugins you want Stryker to load (`require`) without overwriting the (default) `plugins`.

#	Values	Actions
{{$index+1}}.

reporters With reporters, you can set the reporters for stryker to use.

#	Values	Actions
{{$index+1}}.

.htmlReporter - HtmlReporterOptions

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htmlReporter.baseDir - The output folder for the html report.

symlinkNodeModules - The 'symlinkNodeModules' value indicates whether Stryker should create a symbolic link to your current node_modules directory in the sandbox directories. This makes running your tests by Stryker behave more like your would run the tests yourself in your project directory. Only disable this setting if you really know what you are doing.

tempDirName - Choose a different temp dir that Stryker uses for mutation testing. This directory will contain copies of your source code during a mutation test run. It will be created if it not exists and is *entirely deleted* after a successful run, so change this with caution.

cleanTempDir - Choose whether or not to clean the temp dir (which is ".stryker-tmp" inside the current working directory by default) after a successful run. The temp dir will never be removed when the run failed for some reason (for debugging purposes)

testRunner - With 'testRunner' you specify the test runner that Stryker uses to run your tests. The default value is command. The command runner runs a configurable bash/cmd command and bases the result on the exit code of that program (0 for success, otherwise failed). You can configure this command via the config file using the 'commandRunner: { command: 'npm run mocha' }'. It uses 'npm test' as the command by default.

.thresholds - MutationScoreThresholds

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thresholds.high

thresholds.low

timeoutFactor - Configure the allowed timeout deviation relative to the time of a normal test run. Tweak this if you notice that mutants are prone to creating slower code, but not infinite loops (for that, use `timeoutMS`)

timeoutMS - Configure an absolute timeout deviation. Tweak this if you run Stryker on a busy machine and you need to wait longer to make sure that the code indeed entered an infinite loop.

tsconfigFile - Configure the (root) tsconfig file for typescript projects. This will allow Stryker to rewrite the `extends` and `references` settings in this and related tsconfig files in your sandbox. Defaults to `tsconfig.json`. This setting is also used when you enable the `@stryker-mutator/typescript-checker plugin

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checkers Enable checker plugins here. A checker plugin will be invoked for each mutant before it is run in a test runner. It can check to see of a given mutant is valid, by for example validate that it won't result in a type error

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mutate With mutate you configure the subset of files to use for mutation testing. Generally speaking, these should be your own source files.

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mutator.excludedMutations excludedMutations

appendPlugins A list of additional plugins you want Stryker to load (`require`) without overwriting the (default) `plugins`.

reporters With reporters, you can set the reporters for stryker to use.

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