resolveVersionFromList returns the newest available version from a list of versions that satisfies the provided version constraint.

runBuildpackPhaseForTest runs a buildpack phase as a separate child process. A child process is used to avoid the test suite itself being terminated b

runtimeMatchesInstallableRuntime returns true if the GOOGLE_RUNTIME should match the installable runtime. This is because PHP might install python and

saveErrorOutput saves to the builder output file, if appropriate.

saveSuccessOutput saves information from the context into BUILDER_OUTPUT.

sendRequestWithTimeout makes an http call to a given host:port/path with the specified timeout or send a cloud event payload with timeout to host:port

detect if the app uses AI (Genkit or GenAI API) and the corresponding version, and set metadata accordingly

detect if the app uses AI (Genkit or GenAI API) and the corresponding version, and set metadata accordingly

setupSource runs the given setup function to set up the source directory before a test.

springBootPluginDefined checks if the spring-boot-maven-plugin is defined.

stackToVersion returns the default feature version for the given stack.

tarDestination returns the filepath that a tar entry should be written to when extracted.

untar extracts a tarball from a reader and writes it to the given directory.

validateDescriptor is used to validate the descriptors in the descriptors table.

watchEntrypointFile returns the entrypoint file to be used with node --watch. The entrypoint file is determined in the following order of preference:

writeBuildAndRunScript writes the contents of a file that builds code and then runs the resulting program

writeFakePythonScript is a helper to create fake python3 executable

Build serves as a common builder for Cloud Functions buildpacks.

CheckIncompatibleDependencies checks for incompatible dependencies using pip check.

DetectFn is the exported detect function.

EnsureLockfile returns the name of the lockfile, generating a package-lock.json if necessary.

EnsurePoetryLockfile checks for poetry.lock and generates it if it doesn't exist.

EnsureUVLockfile checks for uv.lock and generates it if it doesn't exist.

FindProjectFile finds the csproj file using the 'GOOGLE_BUILDABLE' env var and falling back with a search of the current directory.

ForEachFloatDP executes a function for each initialized FloatDP

GradleCmd returns the command that should be used to invoke gradle for this build.

HTTPStatus returns the status code for a url.

HasYarnWorkspacePlugin returns true if this project has Yarn2's workspaces plugin installed.

ImproperSecretFormatError creates a FahError with metadata about an improperly formatted secret in the user's apphosting.yaml that caused the build to

InstallBun installs Bun in the given layer using the curl installer.

InstallPoetry installs the poetry CLI using uv to speed up the installation.

InstallSupervisor installs supervisor package to the layer.