Index: .arclint
===================================================================
--- .arclint
+++ .arclint
@@ -25,9 +25,8 @@
     },
     "eslint": {
       "type": "eslint",
-      "bin": ["eslint", "build\\arclint\\dummies\\eslint.bat", "build/arclint/dummies/eslint.php"],
-      "include": "/\\.js$/",
-      "config": "build/arclint/configs/eslintrc.json"
+      "bin": ["build/arclint/eslint/node_modules/.bin/eslint", "eslint", "build\\arclint\\dummies\\eslint.bat", "build/arclint/dummies/eslint.php"],
+      "include": "/\\.js$/"
     },
     "cppcheck": {
       "type": "cppcheck",
Index: .eslintrc.json
===================================================================
--- /dev/null
+++ .eslintrc.json
@@ -0,0 +1,10 @@
+{
+    "root": true,
+    "extends": "./build/arclint/configs/eslintrc.json",
+    "ignorePatterns": [
+      "binaries/data/mods/mod/globalscripts/sprintf.js",
+      "build/arclint/eslint/node_modules/",
+      "libraries/",
+      "source/"
+    ]
+}
Index: .gitignore
===================================================================
--- .gitignore
+++ .gitignore
@@ -19,6 +19,9 @@
 binaries/system/test
 binaries/system/test_dbg
 
+build/arclint/eslint/node_modules/
+build/arclint/eslint/.eslintcache
+build/arclint/eslint/package-lock.json
 build/workspaces/codeblocks/
 build/workspaces/gcc/
 build/workspaces/xcode3/
Index: build/arclint/README.md
===================================================================
--- build/arclint/README.md
+++ build/arclint/README.md
@@ -25,10 +25,10 @@
 
 #### eslint
 
-Installation via npm is recommended. The linter assumes a global installation of both eslint and the "brace-rules" plugin.
-`npm install -g eslint@latest eslint-plugin-brace-rules`
+Node.js is required. Installation via npm is recommended.
+Run `npm install` in the `build/arclint/eslint/` directory.
 
-See also https://eslint.org/docs/user-guide/getting-started
+See also <https://nodejs.org/> and <https://eslint.org/docs/user-guide/getting-started>.
 
 #### cppcheck
 
Index: build/arclint/configs/eslintrc.json
===================================================================
--- build/arclint/configs/eslintrc.json
+++ build/arclint/configs/eslintrc.json
@@ -1,4 +1,5 @@
 {
+    "root": true,
     "parserOptions": {
         "ecmaVersion": 2020
     },
Index: build/arclint/dummies/cppcheck.php
===================================================================
--- build/arclint/dummies/cppcheck.php
+++ build/arclint/dummies/cppcheck.php
@@ -26,7 +26,7 @@
  * Set the VERBOSE env variable to generate an 'advice' level lint message.
  */
 
-$verbose = getenv("VERBOSE") ? getenv("VERBOSE") : false;
+$verbose = (bool)getenv("VERBOSE");
 
 $advice = !$verbose ? "" : <<<EOD
 <error id="skipped" msg="Cppcheck was not found - skipped" severity="advice" inconclusive="true">
@@ -40,4 +40,3 @@
 EOD;
 
 fwrite(STDERR, $str);
-?>
Index: build/arclint/dummies/eslint.php
===================================================================
--- build/arclint/dummies/eslint.php
+++ build/arclint/dummies/eslint.php
@@ -26,7 +26,7 @@
  * Set the VERBOSE env variable to generate an 'advice' level lint message.
  */
 
-$verbose = getenv("VERBOSE") ? getenv("VERBOSE") : false;
+$verbose = (bool)getenv("VERBOSE");
 
 $advice = <<<EOD
 {
@@ -42,4 +42,3 @@
 EOD;
 
 fwrite(STDOUT, $verbose ? "[$advice]" : "[]");
-?>
Index: build/arclint/eslint/package.json
===================================================================
--- /dev/null
+++ build/arclint/eslint/package.json
@@ -0,0 +1,13 @@
+{
+  "private": true,
+  "devDependencies": {
+    "eslint": "7.22.0",
+    "eslint-plugin-brace-rules": "0.1.6"
+  },
+  "scripts": {
+    "test": "npm run -s lint",
+    "lint": "eslint --cache --resolve-plugins-relative-to . --report-unused-disable-directives ../../../",
+    "fix": "eslint --cache --resolve-plugins-relative-to . --fix",
+    "fix-all": "eslint --cache --resolve-plugins-relative-to . --fix ../../../"
+  }
+}
Index: build/arclint/pyrolint/src/ESLintLinter.php
===================================================================
--- build/arclint/pyrolint/src/ESLintLinter.php
+++ build/arclint/pyrolint/src/ESLintLinter.php
@@ -33,46 +33,35 @@
   }
 
   public function getDefaultBinary() {
+    // See also the "bin" array in /.arclint
     return 'eslint';
   }
 
   public function getInstallInstructions() {
     return pht(
-      'Install eslint using npm install -g eslint.',
-      'Install the brace-rule plugin using',
-      'npm install -g eslint-plugin-brace-rules');
+      'Install eslint from npm by running "npm install" in the /build/arclint/eslint/ directory.'
+    );
   }
 
   protected function getMandatoryFlags() {
-    list($err, $stdout, $stderr) = exec_manual('npm root -g');
+    // If the 'eslint' was installed globally (e.g. as Jenkins CI has) then
+    // tell ESLint to load for plugins from the global node path.
+    // Otherwise, use the local install (e.g. a developer ran 'npm install' in
+    // their /build/arclint/eslint/ directory). Use of global install is discouraged
+    // for developers, but for CI we do it because that's easier to snapshot
+    // and re-use between builds.
+    if ($this->getBinary() === 'eslint') {
+      list($err, $stdout, $stderr) = exec_manual('npm root -g');
+      $nodePath = strtok($stdout, "\n");
+    } else {
+      $nodePath = 'build/arclint/eslint/';
+    }
     return array(
       '--format=json',
       '--no-color',
-      '--config',
-      $this->config,
-      // This allows globally installing plugins even with eslint 6+
       '--resolve-plugins-relative-to',
-      strtok($stdout, "\n")
-    );
-  }
-
-  public function getLinterConfigurationOptions() {
-    $options = array(
-      'config' => array(
-        'type' => 'optional string',
-        'help' => pht('Link to the config file.'),
-      ),
+      $nodePath
     );
-    return $options + parent::getLinterConfigurationOptions();
-  }
-
-  public function setLinterConfigurationValue($key, $value) {
-    switch ($key) {
-      case 'config':
-        $this->config = $value;
-        return;
-    }
-    return parent::setLinterConfigurationValue($key, $value);
   }
 
   protected function parseLinterOutput($path, $err, $stdout, $stderr) {