diff --git a/support/install-packages.sh b/support/install-packages.sh
new file mode 100755
index 0000000000..5430bc20ce
--- /dev/null
+++ b/support/install-packages.sh
@@ -0,0 +1,67 @@
+#!/bin/bash
+#
+# SPDX-FileCopyrightText: © 2020 Liferay, Inc. <https://liferay.com>
+# SPDX-License-Identifier: MIT
+
+##
+#
+# A hacky script to overwrite liferay-frontend-projects packages in a
+# liferay-repo checkout with the ones from this repo, for testing purposes.
+#
+# Usage:
+#
+#     bash install-packages.sh $PATH_TO_PORTAL_REPO
+
+die() {
+  echo "error: $*"
+  exit 1
+}
+
+remove() {
+  while (( "$#" )); do
+    local DEP=$1
+
+    if grep "\"$DEP\"" package.json &> /dev/null; then
+      echo "Removing $DEP dependency"
+      yarn remove -W --silent "$DEP"
+    fi
+
+    shift
+  done
+}
+
+#
+# Main.
+#
+
+ROOT=$(realpath "${BASH_SOURCE%/*}/..")
+
+if [ $# != 1 ]; then
+  echo "Usage: $0 PORTAL_REPO"
+  exit 1
+fi
+
+PORTAL_REPO=$1
+MODULES="${PORTAL_REPO}/modules"
+
+if [ ! -d "$MODULES" -o ! -e "$MODULES/yarn.lock" ]; then
+  die "\`$PORTAL_REPO\` does not appear to be a liferay-portal checkout"
+fi
+
+echo "Purging nested node_modules folders"
+
+find "$ROOT/projects" -depth -name node_modules -print -exec rm -r {} \;
+
+cd "$MODULES"
+
+remove \
+    @liferay/npm-scripts \
+    @liferay/eslint-config \
+    liferay-npm-scripts \
+    eslint-config-liferay
+
+echo "Adding local dependencies"
+
+yarn add -W --dev --silent \
+  "$ROOT/projects/eslint-config" \
+  "$ROOT/projects/npm-tools/packages/npm-scripts"