[Home](./index.md) > [kibana-plugin-plugins-expressions-public](./kibana-plugin-plugins-expressions-public.md) > [ExpressionFunction](./kibana-plugin-plugins-expressions-public.expressionfunction.md) > [fn](./kibana-plugin-plugins-expressions-public.expressionfunction.fn.md) ## ExpressionFunction.fn property Function to run function (context, args) Signature: ```typescript fn: (input: ExpressionValue, params: Record, handlers: object) => ExpressionValue; ```