diff --git a/.eslintrc.cjs b/.eslintrc.cjs
index 22a8050c4d..1ee989b4ea 100644
--- a/.eslintrc.cjs
+++ b/.eslintrc.cjs
@@ -1,3 +1,4 @@
+/** @type {import('eslint').Linter.Config} */
 module.exports = {
   parserOptions: {
     sourceType: 'script',
@@ -347,7 +348,15 @@ module.exports = {
     'no-restricted-globals': 'off',
     'no-restricted-imports': 'off',
     'no-restricted-properties': 'off',
-    'no-restricted-syntax': 'off',
+    'no-restricted-syntax': [
+      'error',
+      {
+        selector:
+          'MemberExpression[property.name="env"] > .object[object.name="globalThis"][property.name="process"]',
+        message:
+          "Never use `process.env` with `globalThis` because bundlers incorrectly replace it and doesn't tree shake unused code",
+      },
+    ],
     'no-return-assign': 'error',
     'no-return-await': 'error',
     'no-script-url': 'error',
@@ -494,6 +503,8 @@ module.exports = {
       plugins: ['@typescript-eslint', 'eslint-plugin-tsdoc'],
       extends: ['plugin:import/typescript'],
       rules: {
+        // https://typescript-eslint.io/linting/troubleshooting/#i-get-errors-from-the-no-undef-rule-about-global-variables-not-being-defined-even-though-there-are-no-typescript-errors
+        'no-undef': 'off',
         //////////////////////////////////////////////////////////////////////////
         // `eslint-plugin-tsdoc` rule list based on `v0.2.x`
         // https://github.com/microsoft/tsdoc/tree/master/eslint-plugin
diff --git a/.gitignore b/.gitignore
index b3a652de18..d42f24fa55 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,3 +16,4 @@
 /npmEsmDist
 /denoDist
 /websiteDist
+.idea/
diff --git a/src/jsutils/instanceOf.ts b/src/jsutils/instanceOf.ts
index 489d63f42d..4307b310a6 100644
--- a/src/jsutils/instanceOf.ts
+++ b/src/jsutils/instanceOf.ts
@@ -8,8 +8,7 @@ import { inspect } from './inspect.js';
  */
 export const instanceOf: (value: unknown, constructor: Constructor) => boolean =
   /* c8 ignore next 6 */
-  // FIXME: https://github.com/graphql/graphql-js/issues/2317
-  globalThis.process?.env.NODE_ENV === 'production'
+  globalThis.process !== undefined && process.env.NODE_ENV === 'production'
     ? function instanceOf(value: unknown, constructor: Constructor): boolean {
         return value instanceof constructor;
       }