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diff --git a/tools/lint/eslint/update.sh b/tools/lint/eslint/update.sh
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+#!/bin/sh
+# Script to regenerate the npm packages used for ESLint by the builders.
+# Requires
+
+# Force the scripts working directory to be projdir/tools/lint/eslint.
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+cd $DIR
+
+if [ -z "$TASKCLUSTER_ACCESS_TOKEN" -o -z "$TASKCLUSTER_CLIENT_ID" -o -z "$TASKCLUSTER_ROOT_URL" ]; then
+  echo "Please ensure you have run the taskcluster shell correctly to set"
+  echo "the TASKCLUSTER_ACCESS_TOKEN, TASKCLUSTER_CLIENT_ID and"
+  echo "TASKCLUSTER_ROOT_URL environment variables."
+  echo "See https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint/enabling-rules.html"
+  exit 1;
+fi
+
+echo ""
+echo "Removing node_modules and package-lock.json..."
+# Move to the top-level directory.
+cd ../../../
+rm -rf node_modules/
+rm -rf tools/lint/eslint/eslint-plugin-mozilla/node_modules
+rm package-lock.json
+
+echo "Installing eslint and external plugins..."
+# ESLint and all _external_ plugins are listed in this directory's package.json,
+# so a regular `npm install` will install them at the specified versions.
+# The in-tree eslint-plugin-mozilla is kept out of this tooltool archive on
+# purpose so that it can be changed by any developer without requiring tooltool
+# access to make changes.
+./mach npm install
+
+echo "Creating eslint.tar.gz..."
+tar cvz --exclude=eslint-plugin-mozilla --exclude=eslint-plugin-spidermonkey-js -f eslint.tar.gz node_modules
+
+echo "Adding eslint.tar.gz to tooltool..."
+rm tools/lint/eslint/manifest.tt
+./python/mozbuild/mozbuild/action/tooltool.py add --visibility public --unpack eslint.tar.gz
+
+echo "Uploading eslint.tar.gz to tooltool..."
+./python/mozbuild/mozbuild/action/tooltool.py upload --message "node_modules folder update for tools/lint/eslint"
+
+echo "Cleaning up..."
+mv manifest.tt tools/lint/eslint/manifest.tt
+rm eslint.tar.gz
+
+cd $DIR
+
+echo ""
+echo "Update complete, please commit and check in your changes."