From 46dec4f3d9be21d320b6bb912061f1b7a0c63c05 Mon Sep 17 00:00:00 2001
From: Lillian Zhang <47681745+lillianzhang331@users.noreply.github.com>
Date: Wed, 5 May 2021 12:06:48 -0700
Subject: [PATCH] Flush cache with version change (#40)

* nodejs- clear cache if node version changed

* copy functionality to npm yarn and ts

* store_node_version tests for npm nodejs and ts

* fix typo

* clear cache tests

* fixes to clearing cache tests

* dont need to mkdir

* shellcheck

* change version from 12 to 14

* change to use env.build instead of store.toml

* use env.build PREV_NODE_VERSION var

* address review comments

* stub node command, mock node 14, check for PREV_NODE_VERSION var

* use -n instead of ! -z
---
 buildpacks/nodejs/CHANGELOG.md             |  2 +
 buildpacks/nodejs/bin/build                |  6 ++
 buildpacks/nodejs/lib/build.sh             | 52 +++++++++++++---
 buildpacks/nodejs/shpec/build_shpec.sh     | 70 +++++++++++++++++++---
 buildpacks/npm/bin/build                   |  4 ++
 buildpacks/npm/lib/build.sh                | 34 ++++++++---
 buildpacks/npm/mocks/node/v14/bin/node     |  7 +++
 buildpacks/npm/shpec/build_shpec.sh        | 62 ++++++++++++++++---
 buildpacks/typescript/bin/build            |  4 ++
 buildpacks/typescript/lib/build.sh         | 18 ++++++
 buildpacks/typescript/shpec/build_shpec.sh | 61 ++++++++++++++++---
 buildpacks/yarn/bin/build                  |  2 +
 buildpacks/yarn/lib/build.sh               | 35 ++++++++---
 13 files changed, 306 insertions(+), 51 deletions(-)
 create mode 100644 buildpacks/npm/mocks/node/v14/bin/node

diff --git a/buildpacks/nodejs/CHANGELOG.md b/buildpacks/nodejs/CHANGELOG.md
index 0b907aea..35f3e8e9 100644
--- a/buildpacks/nodejs/CHANGELOG.md
+++ b/buildpacks/nodejs/CHANGELOG.md
@@ -3,6 +3,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+- Change node engine version from 12 to 14 ([#40](https://github.com/heroku/buildpacks-node/pull/40))
+- Clear cache when node version changes ([#40](https://github.com/heroku/buildpacks-node/pull/40))
 
 ## [0.7.3] 2021/03/04
 - Flush cache when stack image changes ([#28](https://github.com/heroku/buildpacks-node/pull/28))
diff --git a/buildpacks/nodejs/bin/build b/buildpacks/nodejs/bin/build
index 9610e122..499d02aa 100755
--- a/buildpacks/nodejs/bin/build
+++ b/buildpacks/nodejs/bin/build
@@ -22,6 +22,8 @@ rm -rf node_modules
 
 clear_cache_on_stack_change "$layers_dir"
 
+write_to_store_toml "$layers_dir"
+
 set_up_environment "$layers_dir/nodejs"
 
 bootstrap_buildpack "$layers_dir/bootstrap"
@@ -29,9 +31,13 @@ bootstrap_buildpack "$layers_dir/bootstrap"
 install_or_reuse_toolbox "$layers_dir/toolbox"
 export PATH=$layers_dir/toolbox/bin:$PATH
 
+store_node_version "$layers_dir/nodejs"
+
 install_or_reuse_node "$layers_dir/nodejs" "$build_dir"
 export PATH=$layers_dir/nodejs/bin:$PATH
 
+clear_cache_on_node_version_change "$layers_dir" "$layers_dir/nodejs"
+
 parse_package_json_engines "$layers_dir/package_manager_metadata" "$build_dir"
 
 if [[ -f "yarn.lock" ]]; then
diff --git a/buildpacks/nodejs/lib/build.sh b/buildpacks/nodejs/lib/build.sh
index 7ca70582..2b522e34 100755
--- a/buildpacks/nodejs/lib/build.sh
+++ b/buildpacks/nodejs/lib/build.sh
@@ -16,6 +16,18 @@ source "$bp_dir/lib/utils/log.sh"
 # shellcheck source=/dev/null
 source "$bp_dir/lib/utils/toml.sh"
 
+write_to_store_toml() {
+	local layers_dir=$1
+
+	if [[ ! -f "${layers_dir}/store.toml" ]]; then
+		touch "${layers_dir}/store.toml"
+		cat <<TOML >"${layers_dir}/store.toml"
+[metadata]
+last_stack = "$CNB_STACK_ID"
+TOML
+	fi
+}
+
 clear_cache_on_stack_change() {
 	local layers_dir=$1
 
@@ -29,14 +41,6 @@ clear_cache_on_stack_change() {
 			rm -rf "${layers_dir:?}"/*
 		fi
 	fi
-
-	if [[ ! -f "${layers_dir}/store.toml" ]]; then
-		touch "${layers_dir}/store.toml"
-		cat <<TOML >"${layers_dir}/store.toml"
-[metadata]
-last_stack = "$CNB_STACK_ID"
-TOML
-	fi
 }
 
 set_up_environment() {
@@ -68,6 +72,18 @@ install_or_reuse_toolbox() {
 	echo "launch = false" >>"${layer_dir}.toml"
 }
 
+store_node_version() {
+	local layer_dir=$1
+	local prev_node_version
+	# shellcheck disable=SC2002
+	prev_node_version=$(cat "${layer_dir}.toml" | grep version | xargs | cut -d " " -f3)
+	mkdir -p "${layer_dir}/env.build"
+	if [[ -s "${layer_dir}/env.build/PREV_NODE_VERSION.override" ]]; then
+		rm -rf "${layer_dir}/env.build/PREV_NODE_VERSION.override"
+	fi
+	echo -e "$prev_node_version\c" >>"${layer_dir}/env.build/PREV_NODE_VERSION.override"
+}
+
 install_or_reuse_node() {
 	local layer_dir=$1
 	local build_dir=$2
@@ -79,7 +95,7 @@ install_or_reuse_node() {
 	status "Installing Node"
 	info "Getting Node version"
 	engine_node=$(json_get_key "$build_dir/package.json" ".engines.node")
-	node_version=${engine_node:-12.x}
+	node_version=${engine_node:-14.x}
 
 	info "Resolving Node version"
 	resolved_data=$(resolve-version node "$node_version")
@@ -106,6 +122,24 @@ install_or_reuse_node() {
 	fi
 }
 
+clear_cache_on_node_version_change() {
+	local layers_dir=$1
+	local layer_dir=$2
+	local prev_node_version
+	local curr_node_version
+
+	curr_node_version="$(node -v)"
+	curr_node_version=${curr_node_version:1} #to truncate the "v" that is concatedated to version in node -v
+	if [[ -s "${layer_dir}/env.build/PREV_NODE_VERSION" ]]; then
+		prev_node_version=$(cat "${layer_dir}/env.build/PREV_NODE_VERSION")
+
+		if [[ "$curr_node_version" != "$prev_node_version" ]]; then
+			info "Deleting cache because node version changed from \"$prev_node_version\" to \"$curr_node_version\""
+			rm -rf "${layers_dir}/yarn" "${layers_dir}/yarn.toml"
+		fi
+	fi
+}
+
 parse_package_json_engines() {
 	local layer_dir=$1
 	local build_dir=$2
diff --git a/buildpacks/nodejs/shpec/build_shpec.sh b/buildpacks/nodejs/shpec/build_shpec.sh
index 1a7d9902..fa8ff4c4 100644
--- a/buildpacks/nodejs/shpec/build_shpec.sh
+++ b/buildpacks/nodejs/shpec/build_shpec.sh
@@ -46,6 +46,7 @@ rm_binaries() {
 
 describe "lib/build.sh"
 	stub_command "info"
+	stub_command "node"
 	rm_binaries
 
 	layers_dir=$(create_temp_layer_dir)
@@ -55,14 +56,6 @@ describe "lib/build.sh"
 
 		export CNB_STACK_ID="heroku-20"
 
-		it "creates store.toml when not present"
-			assert file_absent "$layers_dir/store.toml"
-
-			clear_cache_on_stack_change "$layers_dir"
-
-			assert file_present "$layers_dir/store.toml"
-		end
-
 		it "does not delete layers with same stack"
 			assert file_present "$layers_dir/my_layer.toml"
 
@@ -71,6 +64,8 @@ describe "lib/build.sh"
 			assert file_present "$layers_dir/my_layer.toml"
 		end
 
+		write_to_store_toml "$layers_dir"
+
 		it "deletes layers when stack changes"
 			CNB_STACK_ID="heroku-22"
 
@@ -84,6 +79,51 @@ describe "lib/build.sh"
 		unset CNB_STACK_ID
 	end
 
+	describe "clear_cache_on_node_version_change"
+
+		touch "$layers_dir/yarn"
+
+		it "does not delete layers with same node version"
+			mkdir "${layers_dir}/nodejs"
+			mkdir "${layers_dir}/nodejs/env.build"
+			
+			echo -e "$(node -v)\c" >>"${layers_dir}/nodejs/env.build/PREV_NODE_VERSION"
+
+			assert file_present "$layers_dir/yarn"
+
+			clear_cache_on_node_version_change "$layers_dir" "$layers_dir/nodejs"
+
+			assert file_present "$layers_dir/yarn"
+		end
+
+		it "deletes layers when node version changes"
+			rm -rf "${layers_dir}/nodejs/env.build/PREV_NODE_VERSION"
+			echo -e "different_version" >>"${layers_dir}/nodejs/env.build/PREV_NODE_VERSION"
+
+			assert file_present "$layers_dir/yarn"
+
+			clear_cache_on_node_version_change "$layers_dir" "$layers_dir/nodejs"
+
+			assert file_absent "$layers_dir/yarn"
+		end
+
+	end
+
+	describe "write_to_store_toml"
+
+		if [[ -s "$layers_dir/store.toml" ]]; then
+			rm -rf "$layers_dir/store.toml"
+		fi
+
+		it "creates store.toml when not present"
+			assert file_absent "$layers_dir/store.toml"
+
+			write_to_store_toml "$layers_dir"
+
+			assert file_present "$layers_dir/store.toml"
+		end
+	end
+
 	describe "boostrap_buildpack"
 		create_binaries "$layers_dir/bootstrap"
 
@@ -150,6 +190,19 @@ describe "lib/build.sh"
 		end
 	end
 
+	describe "store_node_version"
+		layers_dir=$(create_temp_layer_dir)
+
+		touch "${layers_dir}/nodejs.toml"
+		echo -e "[metadata]\nversion = \"test_version\"" > "${layers_dir}/nodejs.toml"
+
+		it "stores node version in PREV_NODE_VERSION env"
+			assert file_absent "$layers_dir/nodejs/env.build/PREV_NODE_VERSION.override"
+			store_node_version "$layers_dir/nodejs"
+			assert equal "$(cat "$layers_dir/nodejs/env.build/PREV_NODE_VERSION.override")" test_version
+		end
+	end
+
 	describe "install_or_reuse_node"
 		layers_dir=$(create_temp_layer_dir)
 		project_dir=$(create_temp_project_dir)
@@ -301,6 +354,7 @@ describe "lib/build.sh"
 	end
 
 	unstub_command "info"
+	unstub_command "node"
 	rm_binaries
 end
 
diff --git a/buildpacks/npm/bin/build b/buildpacks/npm/bin/build
index a4be67f1..2d01522a 100755
--- a/buildpacks/npm/bin/build
+++ b/buildpacks/npm/bin/build
@@ -29,6 +29,10 @@ warn_prebuilt_modules "$build_dir"
 
 run_prebuild "$build_dir"
 
+clear_cache_on_node_version_change "$layers_dir"
+
+write_to_store_toml "$layers_dir"
+
 install_or_reuse_node_modules "$build_dir" "$layers_dir/node_modules"
 
 run_build "$build_dir"
diff --git a/buildpacks/npm/lib/build.sh b/buildpacks/npm/lib/build.sh
index 6b7d49e9..f8accee8 100755
--- a/buildpacks/npm/lib/build.sh
+++ b/buildpacks/npm/lib/build.sh
@@ -47,14 +47,6 @@ clear_cache_on_stack_change() {
 			rm -rf "${layers_dir:?}"/*
 		fi
 	fi
-
-	if [[ ! -f "${layers_dir}/store.toml" ]]; then
-		touch "${layers_dir}/store.toml"
-		cat <<TOML >"${layers_dir}/store.toml"
-[metadata]
-last_stack = "$CNB_STACK_ID"
-TOML
-	fi
 }
 
 detect_package_lock() {
@@ -143,6 +135,32 @@ install_modules() {
 	fi
 }
 
+write_to_store_toml() {
+	local layers_dir=$1
+
+	if [[ ! -f "${layers_dir}/store.toml" ]]; then
+		touch "${layers_dir}/store.toml"
+		cat <<TOML >"${layers_dir}/store.toml"
+[metadata]
+last_stack = "$CNB_STACK_ID"
+TOML
+	fi
+}
+
+clear_cache_on_node_version_change() {
+	local layers_dir=$1
+	local curr_node_version
+
+	curr_node_version="$(node -v)"
+	curr_node_version=${curr_node_version:1} #to truncate the "v" that is concatedated to version in node -v
+	if [[ -n "$PREV_NODE_VERSION" ]]; then
+		if [[ "$curr_node_version" != "$PREV_NODE_VERSION" ]]; then
+			info "Deleting cache because node version changed from \"$PREV_NODE_VERSION\" to \"$curr_node_version\""
+			rm -rf "${layers_dir:?}"/*
+		fi
+	fi
+}
+
 install_or_reuse_node_modules() {
 	local build_dir=$1
 	local layer_dir=$2
diff --git a/buildpacks/npm/mocks/node/v14/bin/node b/buildpacks/npm/mocks/node/v14/bin/node
new file mode 100644
index 00000000..6a0e127d
--- /dev/null
+++ b/buildpacks/npm/mocks/node/v14/bin/node
@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+node_version="v14.16.1"
+
+if [[ "$1" == "-v" ]]; then
+	echo "$node_version"
+fi
diff --git a/buildpacks/npm/shpec/build_shpec.sh b/buildpacks/npm/shpec/build_shpec.sh
index 35666475..073b84d6 100755
--- a/buildpacks/npm/shpec/build_shpec.sh
+++ b/buildpacks/npm/shpec/build_shpec.sh
@@ -53,8 +53,13 @@ use_npm() {
 	PATH="${shpec_dir}/../mocks/npm/v$1/bin:$CURRENT_PATH"
 }
 
+use_node() {
+	PATH="${shpec_dir}/../mocks/node/v$1/bin:$CURRENT_PATH"
+}
+
 describe "lib/build.sh"
 	install_tools
+	stub_command "node"
 
 	CURRENT_PATH=$PATH
 	layers_dir=$(create_temp_layer_dir)
@@ -64,14 +69,6 @@ describe "lib/build.sh"
 
 		export CNB_STACK_ID="heroku-20"
 
-		it "creates store.toml when not present"
-			assert file_absent "$layers_dir/store.toml"
-
-			clear_cache_on_stack_change "$layers_dir"
-
-			assert file_present "$layers_dir/store.toml"
-		end
-
 		it "does not delete layers with same stack"
 			assert file_present "$layers_dir/my_layer.toml"
 
@@ -80,8 +77,10 @@ describe "lib/build.sh"
 			assert file_present "$layers_dir/my_layer.toml"
 		end
 
+		write_to_store_toml "$layers_dir"
+
 		it "deletes layers when stack changes"
-			CNB_STACK_ID="heroku-22"
+			export CNB_STACK_ID="heroku-22"
 
 			assert file_present "$layers_dir/my_layer.toml"
 
@@ -93,6 +92,50 @@ describe "lib/build.sh"
 		unset CNB_STACK_ID
 	end
 
+	describe "clear_cache_on_node_version_change"
+
+		touch "$layers_dir/node_modules"
+
+		it "does not delete layers with same node version"
+			use_node 14
+			version="$(node -v)"
+			truncated_version=${version:1}
+			export PREV_NODE_VERSION="$truncated_version"
+
+			assert file_present "$layers_dir/node_modules"
+
+			clear_cache_on_node_version_change "$layers_dir"
+
+			assert file_present "$layers_dir/node_modules"
+		end
+
+		it "deletes layers when node version changes"
+			export PREV_NODE_VERSION="different_version"
+
+			assert file_present "$layers_dir/node_modules"
+
+			clear_cache_on_node_version_change "$layers_dir"
+
+			assert file_absent "$layers_dir/node_modules"
+		end
+		unset PREV_NODE_VERSION
+	end
+
+	describe "write_to_store_toml"
+
+		if [[ -s "$layers_dir/store.toml" ]]; then
+			rm -rf "$layers_dir/store.toml"
+		fi
+
+		it "creates store.toml when not present"
+			assert file_absent "$layers_dir/store.toml"
+
+			write_to_store_toml "$layers_dir"
+
+			assert file_present "$layers_dir/store.toml"
+		end
+	end
+
 	describe "prune_devdependencies"
 		project_dir=$(create_temp_project_dir)
 		use_npm 6
@@ -319,5 +362,6 @@ describe "lib/build.sh"
 	end
 
 	unstub_command "log_info"
+	unstub_command "node"
 	rm_tools_and_mocks
 end
diff --git a/buildpacks/typescript/bin/build b/buildpacks/typescript/bin/build
index 8df4aa31..fb917e84 100755
--- a/buildpacks/typescript/bin/build
+++ b/buildpacks/typescript/bin/build
@@ -15,6 +15,10 @@ source "$bp_dir/lib/build.sh"
 
 clear_cache_on_stack_change "$layers_dir"
 
+clear_cache_on_node_version_change "$layers_dir"
+
+write_to_store_toml "$layers_dir"
+
 if check_tsc_binary "$build_dir"; then
 	export PATH=./node_modules/typescript/bin:$PATH
 fi
diff --git a/buildpacks/typescript/lib/build.sh b/buildpacks/typescript/lib/build.sh
index ccaf29f2..745c921d 100755
--- a/buildpacks/typescript/lib/build.sh
+++ b/buildpacks/typescript/lib/build.sh
@@ -25,6 +25,10 @@ clear_cache_on_stack_change() {
 			rm -rf "${layers_dir:?}"/*
 		fi
 	fi
+}
+
+write_to_store_toml() {
+	local layers_dir=$1
 
 	if [[ ! -f "${layers_dir}/store.toml" ]]; then
 		touch "${layers_dir}/store.toml"
@@ -35,6 +39,20 @@ TOML
 	fi
 }
 
+clear_cache_on_node_version_change() {
+	local layers_dir=$1
+	local curr_node_version
+
+	curr_node_version="$(node -v)"
+	curr_node_version=${curr_node_version:1} #to truncate the "v" that is concatedated to version in node -v
+	if [[ -n "$PREV_NODE_VERSION" ]]; then
+		if [[ "$curr_node_version" != "$PREV_NODE_VERSION" ]]; then
+			info "Deleting cache because node version changed from \"$PREV_NODE_VERSION\" to \"$curr_node_version\""
+			rm -rf "${layers_dir:?}"/*
+		fi
+	fi
+}
+
 detect_out_dir() {
 	local build_dir=$1
 
diff --git a/buildpacks/typescript/shpec/build_shpec.sh b/buildpacks/typescript/shpec/build_shpec.sh
index 1bc9b90c..506e933a 100755
--- a/buildpacks/typescript/shpec/build_shpec.sh
+++ b/buildpacks/typescript/shpec/build_shpec.sh
@@ -20,6 +20,8 @@ create_temp_layer_dir() {
 
 describe "lib/build.sh"
 
+  stub_command "node"
+
   layers_dir=$(create_temp_layer_dir)
 
   describe "clear_cache_on_stack_change"
@@ -27,14 +29,6 @@ describe "lib/build.sh"
 
     export CNB_STACK_ID="heroku-20"
 
-    it "creates store.toml when not present"
-      assert file_absent "$layers_dir/store.toml"
-
-      clear_cache_on_stack_change "$layers_dir"
-
-      assert file_present "$layers_dir/store.toml"
-    end
-
     it "does not delete layers with same stack"
       assert file_present "$layers_dir/my_layer.toml"
 
@@ -43,8 +37,10 @@ describe "lib/build.sh"
       assert file_present "$layers_dir/my_layer.toml"
     end
 
+    write_to_store_toml "$layers_dir"
+
     it "deletes layers when stack changes"
-      CNB_STACK_ID="heroku-22"
+      export CNB_STACK_ID="heroku-22"
 
       assert file_present "$layers_dir/my_layer.toml"
 
@@ -56,6 +52,50 @@ describe "lib/build.sh"
     unset CNB_STACK_ID
   end
 
+  describe "clear_cache_on_node_version_change"
+
+		touch "$layers_dir/node_modules"
+
+    it "does not delete layers with same node version"
+
+    version="$(node -v)"
+    truncated_version=${version:1}
+    export PREV_NODE_VERSION="$truncated_version"
+
+			assert file_present "$layers_dir/node_modules"
+
+			clear_cache_on_node_version_change "$layers_dir"
+
+			assert file_present "$layers_dir/node_modules"
+		end
+
+		it "deletes layers when node version changes"
+			export PREV_NODE_VERSION="different_version"
+
+			assert file_present "$layers_dir/node_modules"
+
+			clear_cache_on_node_version_change "$layers_dir"
+
+			assert file_absent "$layers_dir/node_modules"
+		end
+    unset PREV_NODE_VERSION
+	end
+
+  describe "write_to_store_toml"
+
+    if [[ -s "$layers_dir/store.toml" ]]; then
+      rm -rf "$layers_dir/store.toml"
+    fi
+
+		it "creates store.toml when not present"
+			assert file_absent "$layers_dir/store.toml"
+
+			write_to_store_toml "$layers_dir"
+
+			assert file_present "$layers_dir/store.toml"
+		end
+	end
+
   describe "detect_out_dir"
     it "exits with 1 if there is no outDir directory"
       project_dir=$(create_temp_project_dir)
@@ -81,4 +121,7 @@ describe "lib/build.sh"
       # assert equal "$?" 0
     end
   end
+
+  unstub_command "node"
+
 end
diff --git a/buildpacks/yarn/bin/build b/buildpacks/yarn/bin/build
index 26e37521..a34929fd 100755
--- a/buildpacks/yarn/bin/build
+++ b/buildpacks/yarn/bin/build
@@ -20,6 +20,8 @@ fail_multiple_lockfiles "$build_dir"
 clear_cache_on_stack_change "$layers_dir"
 export_env "$platform_dir/env" "" ""
 run_prebuild "$build_dir"
+clear_cache_on_node_version_change "$layers_dir"
+write_to_store_toml "$layers_dir"
 install_or_reuse_node_modules "$build_dir" "$layers_dir/node_modules"
 run_build "$build_dir"
 write_launch_toml "$build_dir/package.json" "$layers_dir/launch.toml"
diff --git a/buildpacks/yarn/lib/build.sh b/buildpacks/yarn/lib/build.sh
index a3f2c03b..77b1c537 100644
--- a/buildpacks/yarn/lib/build.sh
+++ b/buildpacks/yarn/lib/build.sh
@@ -41,14 +41,6 @@ clear_cache_on_stack_change() {
 			rm -rf "${layers_dir:?}"/*
 		fi
 	fi
-
-	if [[ ! -f "${layers_dir}/store.toml" ]]; then
-		touch "${layers_dir}/store.toml"
-		cat <<TOML >"${layers_dir}/store.toml"
-[metadata]
-last_stack = "$CNB_STACK_ID"
-TOML
-	fi
 }
 
 run_prebuild() {
@@ -74,6 +66,33 @@ install_modules() {
 	fi
 }
 
+write_to_store_toml() {
+	local layers_dir=$1
+
+	if [[ ! -f "${layers_dir}/store.toml" ]]; then
+		touch "${layers_dir}/store.toml"
+		cat <<TOML >"${layers_dir}/store.toml"
+[metadata]
+last_stack = "$CNB_STACK_ID"
+TOML
+	fi
+}
+
+clear_cache_on_node_version_change() {
+	local layers_dir=$1
+	local curr_node_version
+
+	curr_node_version="$(node -v)"
+	curr_node_version=${curr_node_version:1} #to truncate the "v" that is concatedated to version in node -v
+
+	if [[ -n "$PREV_NODE_VERSION" ]]; then
+		if [[ "$curr_node_version" != "$PREV_NODE_VERSION" ]]; then
+			info "Deleting cache because node version changed from \"$PREV_NODE_VERSION\" to \"$curr_node_version\""
+			rm -rf "${layers_dir:?}"/*
+		fi
+	fi
+}
+
 install_or_reuse_node_modules() {
 	local build_dir=$1
 	local layer_dir=$2