ExtensionBuilder (Extension integration tests library 0.2.0 API)

```
public interface ExtensionBuilder
```
This interface allows customizing how extensions are built before running integration tests.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`build()`	Build the extension JS file.
`static ExtensionBuilder`	`createDefaultNpmBuilder(Path sourceDir, Path builtJsExtension)`	Create a default builder that builds the extension by executing `npm run build`.
`Path`	`getExtensionFile()`	Get the path to the extension JS file.

- Method Detail
  - createDefaultNpmBuilder
```
static ExtensionBuilder createDefaultNpmBuilder(Path sourceDir,
                                                Path builtJsExtension)
```
    Create a default builder that builds the extension by executing npm run build.
    
    Parameters:
    
    sourceDir - source directory containing package.json and other project files
    
    builtJsExtension - path to the built JS extension file
    
    Returns:
    
    new default extension builder
  - build
```
void build()
```
    Build the extension JS file.
  - getExtensionFile
```
Path getExtensionFile()
```
    Get the path to the extension JS file. The file may be missing or outdated if build() was not called before.
    
    Returns:
    
    path to the extension JS file.