[SPARK-35175][BUILD] Add linter for JavaScript source files.

.gitignore

@@ -52,6 +52,7 @@ sql/docs
 sql/site
 lib_managed/
 lint-r-report.log
+lint-js-report.log
 log/
 logs/
 out/
@@ -103,3 +104,6 @@ spark-warehouse/
 
 # For SBT
 .jvmopts
+
+# For Node.js
+node_modules

dev/.rat-excludes

@@ -134,3 +134,4 @@ flights_tiny.txt.1
 over1k
 over10k
 exported_table/*
+node_modules

dev/eslint.json

@@ -0,0 +1,11 @@
+{
+    "env": {
+        "browser": true,
+        "es6": true
+    },
+    "extends": "eslint:recommended",
+    "rules": {
+        "indent": ["error", 2]
+    },
+    "ignorePatterns": ["*.min.js"]
+}

dev/lint-js

@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+set -o pipefail
+
+SCRIPT_DIR="$( cd "$( dirname "$0" )" && pwd )"
+SPARK_ROOT_DIR="$(dirname $SCRIPT_DIR)"
+LINT_JS_REPORT_FILE_NAME="$SPARK_ROOT_DIR/dev/lint-js-report.log"
+LINT_TARGET_FILES=(
+  "$SPARK_ROOT_DIR/core/src/main/resources/org/apache/spark/ui/static/"
+  "$SPARK_ROOT_DIR/sql/core/src/main/resources/org/apache/spark/sql/execution/ui/static/"
+)
+
+if ! type "npm" > /dev/null; then
+  echo "ERROR: You should install npm"
+  exit 1
+fi
+
+if ! type "npx" > /dev/null; then
+  echo "ERROR: You should install npx"
+  exit 1
+fi
+
+cd $SCRIPT_DIR
+
+if ! npm ls eslint > /dev/null; then
+  npm install eslint
+fi
+
+npx eslint -c "$SPARK_ROOT_DIR/dev/eslint.json" $LINT_TARGET_FILES | tee "$LINT_JS_REPORT_FILE_NAME"
+lint_status=$?
+
+if [ "$lint_status" = "0" ] ; then
+   echo "lint-js checks passed."
+else
+  echo "lint-js checks failed."
+fi
+
+exit "$lint_status"