depot/third_party/nixpkgs/pkgs/build-support/node/fetch-yarn-deps/yarn-build-hook.sh

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yarnBuildHook() {
runHook preBuild
echo "Executing yarnBuildHook"
if [ -z "${yarnBuildScript-}" ]; then
yarnBuildScript="build"
fi
if ! type node > /dev/null 2>&1 ; then
echo yarnConfigHook WARNING: a node interpreter was not added to the \
build, and is probably required to run \'yarn $yarnBuildHook\'. \
A common symptom of this is getting \'command not found\' errors \
for Nodejs related tools.
fi
yarn --offline "$yarnBuildScript" $yarnBuildFlags
echo "finished yarnBuildHook"
runHook postBuild
}
if [[ -z "${dontYarnBuild-}" && -z "${buildPhase-}" ]]; then
buildPhase=yarnBuildHook
fi