> ## Documentation Index
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# ExecTransitionFactory

an execution transition.

## Members

* [and\_then](#and_then)

## and\_then

```
transition ExecTransitionFactory.and_then(transition)
```

Returns a new transition that applies this transition followed by the given one. The second transition reads the build settings produced by this one; the original transitions are left unchanged. The result is itself a transition and may be composed further.

A composition may be used as a rule or attribute transition wherever its component transitions could be used. At most one of the composed transitions may target the exec configuration (e.g. `config.exec`). When two transitions in the chain split the configuration, the result has the cross product of their splits; the key for each combined split is the comma-separated concatenation of the component keys.

### Parameters

| Parameter    | Description                                                                             |
| ------------ | --------------------------------------------------------------------------------------- |
| `transition` | [transition](../builtins/transition); required  The transition to apply after this one. |