New: CLIEngine#getRules() (refs #6582)

docs/developer-guide/nodejs-api.md

@@ -27,6 +27,7 @@ While ESLint is designed to be run on the command line, it's possible to use ESL
     * [getFormatter()](#clienginegetformatter)
     * [getErrorResults()](#clienginegeterrorresults)
     * [outputFixes()](#cliengineoutputfixes)
+    * [getRules()](#clienginegetrules)
     * [version](#cliengineversion)
 * [RuleTester](#ruletester)
     * [Customizing RuleTester](#customizing-ruletester)
@@ -732,6 +733,26 @@ var report = cli.executeOnFiles(["myfile.js", "lib/"]);
 CLIEngine.outputFixes(report);
 ```
 
+### CLIEngine#getRules()
+
+This method returns a map of all loaded rules. Under the hood, it calls [Linter#getRules](#lintergetrules).
+
+```js
+const CLIEngine = require("eslint").CLIEngine;
+const cli = new CLIEngine();
+
+cli.getRules();
+
+/*
+Map {
+  'accessor-pairs' => { meta: { docs: [Object], schema: [Array] }, create: [Function: create] },
+  'array-bracket-newline' => { meta: { docs: [Object], schema: [Array] }, create: [Function: create] },
+  ...
+}
+*/
+```
+
+
 ### CLIEngine.version
 
 `CLIEngine` has a static `version` property containing the semantic version number of ESLint that it comes from.

lib/cli-engine.js

@@ -420,6 +420,10 @@ class CLIEngine {
         this.config = new Config(this.options, this.linter);
     }
 
+    getRules() {
+        return this.linter.getRules();
+    }
+
     /**
      * Returns results that only contains errors.
      * @param {LintResult[]} results The results to filter.

tests/lib/cli-engine.js

@@ -2935,6 +2935,15 @@ describe("CLIEngine", () => {
 
     });
 
+    describe("getRules()", () => {
+        it("should expose the list of rules", () => {
+            const engine = new CLIEngine();
+
+            assert.isTrue(engine.getRules().has("no-eval"), "no-eval is present");
+
+        });
+    });
+
     describe("resolveFileGlobPatterns", () => {
 
         leche.withData([