28 lines
720 B
Plaintext
28 lines
720 B
Plaintext
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title: before-build-all
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---
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signature: builder
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---
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summary: This event is emitted before all sources are built.
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---
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type: event
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---
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body:
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This event is emitted before the builder decides to build all sources. It's
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most useful for preprocessing sources on the file system before the rest of
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the build process should pick it up. For instance here a plugin could inject
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additional files into the asset folder and similar things.
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As an example, this is what the [Webpack Support
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:ref](../../../../guides/webpack/) uses.
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## Example
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```python
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import subprocess
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def on_before_build_all(self, builder, **extra):
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root = ospath.join(self.env.root_path, 'webpack')
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subprocess.Popen(['webpack'], cwd=root).wait()
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```
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