[Home](./index.md) > [kibana-plugin-plugins-expressions-server](./kibana-plugin-plugins-expressions-server.md) > [ExpressionAstFunction](./kibana-plugin-plugins-expressions-server.expressionastfunction.md) > [function](./kibana-plugin-plugins-expressions-server.expressionastfunction.function.md) ## ExpressionAstFunction.function property Signature: ```typescript function: string; ```