React.Step

# Module React.Step

    module Step: sig .. end

Update steps.

Update functions returned by `React.S.create` and `React.E.create` implicitely create and execute update steps when used without specifying their `step` argument.

Using explicit `React.step` values with these functions gives more control on the time when the update step is perfomed and allows to perform simultaneous primitive signal updates and event occurences. See also the documentation about update steps and simultaneous events.

# Steps

    type t = React.step

The type for update steps.

    val create : unit -> React.step

`create ()` is a new update step.

    val execute : React.step -> unit

`execute step` executes the update step.
Raises `Invalid_argument` if `step` was already executed.