[Home](./index.md) > [kibana-plugin-plugins-expressions-public](./kibana-plugin-plugins-expressions-public.md) > [Execution](./kibana-plugin-plugins-expressions-public.execution.md) > [input](./kibana-plugin-plugins-expressions-public.execution.input.md) ## Execution.input property Initial input of the execution. N.B. It is initialized to `null` rather than `undefined` for legacy reasons, because in legacy interpreter it was set to `null` by default. Signature: ```typescript input: Input; ```