pyrox.dev
buildDartApplication: Document running build tools
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doc/languages-frameworks/dart.section.md
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doc/languages-frameworks/dart.section.md
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```
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### Running executables from dev_dependencies {#ssec-dart-applications-build-tools}
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Many Dart applications require executables from the `dev_dependencies` section in `pubspec.yaml` to be run before building them.
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This can be done in `preBuild`, in one of two ways:
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1. Packaging the tool with `buildDartApplication`, adding it to Nixpkgs, and running it like any other application
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2. Running the tool from the Pub cache
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Of these methods, the first is recommended when using a tool that does not need
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to be of a specific version.
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To use the second method, first make the derivation accessible within itself (e.g. `let self = ...; in self`), and then run it from the Pub cache in `preBuild`.
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e.g., for `build_runner`:
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```bash
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dart --packages=.dart_tool/package_config.json ${self.pubspecLock.dependencySources.build_runner.packagePath}/bin/build_runner.dart build
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```
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Do _not_ use `dart run <package_name>`, as this will attempt to download dependencies with Pub.
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### Usage with nix-shell {#ssec-dart-applications-nix-shell}
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As `buildDartApplication` provides dependencies instead of `pub get`, Dart needs to be explicitly told where to find them.