MessageFilters

Configuration that specify which levels of message severity will cause a transformation to fail and which will be rendered to the output.

Several AST transformation steps can insert nodes with a message into the tree and the way the runtime handles those is configurable.

By default, MessageFilters.defaults will be used which does not render any messages to the output and fails on severity Error or higher. This is usually the best setting for scenarios that do not involve visual debugging.

When running Laika in a preview server (like the one built into Laika's sbt plugin), then MessageFilters.forVisualDebugging will be used internally. This setting will never cause a transformation to fail, but instead render all messages from level Info upwards.

MessageFilters.custom allows the definition of your own combination of filters.