fix(frontend): make linting work with cjs util file

scripts/webpack/env-util.cjs

@@ -0,0 +1,35 @@
+// @ts-check
+const { parse } = require('ini');
+const { readFileSync, existsSync } = require('node:fs');
+const path = require('path');
+
+const getEnvConfig = () => {
+  const grafanaRoot = path.join(__dirname, '../..');
+  const defaultSettings = readFileSync(`${grafanaRoot}/conf/defaults.ini`, {
+    encoding: 'utf-8',
+  });
+
+  const customSettings = existsSync(`${grafanaRoot}/conf/custom.ini`)
+    ? readFileSync(`${grafanaRoot}/conf/custom.ini`, {
+        encoding: 'utf-8',
+      })
+    : '';
+
+  const defaults = parse(defaultSettings);
+  const custom = parse(customSettings);
+
+  const merged = { ...defaults.frontend_dev, ...custom.frontend_dev };
+
+  // Take all frontend keys from the ini file and prefix with `frontend_dev_`,
+  // so they can be added to `process.env` elsewhere
+  /** @type {Record<string, unknown>} */
+  const env = {};
+
+  for (const [key, value] of Object.entries(merged)) {
+    env[`frontend_dev_${key}`] = value;
+  }
+
+  return env;
+};
+
+module.exports = getEnvConfig;