---
id: gk-gravitymigrate-background-export-step-runner
title: "Filter - gk/gravitymigrate/background/export-step-runner"
sidebar_label: "gk/gravitymigrate/background/export-step-runner"
---

# Filter: gk/gravitymigrate/background/export-step-runner

Filters the callable the export background driver loops to advance one slice.

The test seam for ExportJobDriver: a test may substitute a scripted callable for the real export route, without needing Gravity Forms, the filesystem, or wpdb in scope.

## Parameters

| Name | Type | Description |
|------|------|-------------|
| $step_runner | `callable` | The <code>export</code> AJAX route closure, by default. |

### Since

- %ver%: %ver%

### Source

Defined in `src/Background/ExportJobDriver.php` at line 410