Ability to disable some mutators

[unlight]

Atm, stryker does not work with TypeScript, I need intermediate step to compiler ts source to at least to ES6.

Stryker mangles decorators which leads to guaranteed runtime exception.
Obviously, it is not very useful mutants.

-   FeatureRoutingModule = tslib_1.__decorate([
-       core_1.NgModule({
-           imports: [router_1.RouterModule.forChild(featureRoutes)],
-           exports: [router_1.RouterModule]
-       })
-   ], FeatureRoutingModule);
+   FeatureRoutingModule = tslib_1.__decorate([], FeatureRoutingModule);

[nicojs]

True. We're working on native TypeScript support behind the scenes but it will take some.

In the mean time you might want to enable the importHelpers compiler flag. That would already help you quite a lot by minimizing the boiler plate code it would normally emit. But the example you give would still be there.

How would you like the disabling of mutators to work? Have a disabledMutators flag in the config? Every mutator has a name, in your example it is the ["ArrayDeclarator"] (https://github.com/stryker-mutator/stryker/blob/master/packages/stryker/src/mutators/ArrayDeclaratorMutator.ts)

It could look like this:

{
  disabledMutators: [
   'ArrayDeclarator',
   'BinaryOperator'
}

Its important to note that errors during mutation testing are reported separately as type error, which do not impact the mutation score (as explained in the FAQ)

[shybyte]

This feature request seems to be a duplicate of #13.
@nicojs In #13 I have proposed a different config notation to disable mutations (similar to tslint). What do you think about it?

[nicojs]

Duplicate of #13 (thanks @shybyte )