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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 $DIR
+
+echo "To complete this script you will need the following tokens from https://mozilla-releng.net/tokens"
+echo " - tooltool.upload.public"
+echo " - tooltool.download.public"
+echo ""
+read -p "Are these tokens visible at the above URL (y/n)?" choice
+case "$choice" in
+  y|Y )
+    echo ""
+    echo "1. Go to https://mozilla-releng.net"
+    echo "2. Log in using your Mozilla LDAP account."
+    echo "3. Click on \"Tokens.\""
+    echo "4. Issue a user token with the permissions tooltool.upload.public and tooltool.download.public."
+    echo ""
+    echo "When you click issue you will be presented with a long string. Paste the string into a temporary file called ~/.tooltool-token."
+    echo ""
+    read -rsp $'Press any key to continue...\n' -n 1
+    ;;
+  n|N )
+    echo ""
+    echo "You will need to contact somebody that has these permissions... people most likely to have these permissions are members of the releng, ateam, a sheriff, mratcliffe, or jryans"
+    exit 1
+    ;;
+  * )
+    echo ""
+  echo "Invalid input."
+  continue
+    ;;
+esac
+
+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 --authentication-file=~/.tooltool-token --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."