[Home](./index.md) > [kibana-plugin-plugins-expressions-server](./kibana-plugin-plugins-expressions-server.md) > [ExpressionAstFunction](./kibana-plugin-plugins-expressions-server.expressionastfunction.md) ## ExpressionAstFunction interface Signature: ```typescript export interface ExpressionAstFunction ``` ## Properties | Property | Type | Description | | --- | --- | --- | | [arguments](./kibana-plugin-plugins-expressions-server.expressionastfunction.arguments.md) | Record<string, ExpressionAstArgument[]> | | | [debug](./kibana-plugin-plugins-expressions-server.expressionastfunction.debug.md) | ExpressionAstFunctionDebug | Debug information added to each function when expression is executed in \*debug mode\*. | | [function](./kibana-plugin-plugins-expressions-server.expressionastfunction.function.md) | string | | | [type](./kibana-plugin-plugins-expressions-server.expressionastfunction.type.md) | 'function' | |