[heft-lint] Set eslint-bulk config path environment variable

Author: dmichon-msft

common/changes/@rushstack/heft-lint-plugin/eslint-bulk-overhaul_2024-12-19-00-26.json

@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@rushstack/heft-lint-plugin",
+      "comment": "Speed up heft-lint-plugin by telling eslint-bulk-suppressions exactly where to find the config file.",
+      "type": "patch"
+    }
+  ],
+  "packageName": "@rushstack/heft-lint-plugin"
+}

heft-plugins/heft-lint-plugin/src/Eslint.ts

@@ -2,6 +2,7 @@
 // See LICENSE in the project root for license information.
 
 import * as crypto from 'crypto';
+import * as path from 'path';
 import * as semver from 'semver';
 import type * as TTypescript from 'typescript';
 import type * as TEslint from 'eslint';
@@ -100,6 +101,7 @@ export class Eslint extends LinterBase<TEslint.ESLint.LintResult> {
       };
     }
 
+    process.env.ESLINT_BULK_ESLINTRC_FOLDER_PATH = path.dirname(linterConfigFilePath);
     this._linter = new eslintPackage.ESLint({
       cwd: buildFolderPath,
       overrideConfigFile: linterConfigFilePath,