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With the cli option --baseline or the detekt-gradle-plugin closure-property baseline you can specify a file which is used to generate a baseline.xml. It is a file where code smells are white- or blacklisted.

The intention of a whitelist is that only new code smells are printed on further analysis. The blacklist can be used to write down false positive detections (instead of suppressing them and polute your code base).

The ID node has the following structure: <RuleID>:<Codesmell_Signature>.
When adding a custom issue to the xml file, make sure the RuleID should be self-explaining. The Codesmell_Signature is not printed to the console but can be retrieved from an output file (see output sections). Both values can be found inside the report file.

    <ID>CatchRuntimeException:Junk.kt$e: RuntimeException</ID>
    <ID>NestedBlockDepth:Indentation.kt$Indentation$override fun procedure(node: ASTNode)</ID>
    <ID>ComplexMethod:DetektExtension.kt$DetektExtension$fun convertToArguments(): MutableList&lt;String&gt;</ID>

If you are using the gradle-plugin run the detektBaseline task to generate yourself a baseline.xml.

Be aware that auto formatting cannot be combined with the baseline.