[Home](./index.md) > [kibana-plugin-plugins-expressions-server](./kibana-plugin-plugins-expressions-server.md) > [ExpressionAstFunction](./kibana-plugin-plugins-expressions-server.expressionastfunction.md) > [debug](./kibana-plugin-plugins-expressions-server.expressionastfunction.debug.md) ## ExpressionAstFunction.debug property Debug information added to each function when expression is executed in \*debug mode\*. Signature: ```typescript debug?: ExpressionAstFunctionDebug; ```