Revert "experiment: remove graphql package esm fix"

This reverts commit 930783b.

src/utilities/globals/fix-graphql.ts

@@ -0,0 +1,14 @@
+// The ordering of these imports is important, because it ensures the temporary
+// process.env.NODE_ENV polyfill is defined globally (if necessary) before we
+// import { Source } from 'graphql'. The instanceOf function that we really care
+// about (the one that uses process.env.NODE_ENV) is not exported from the
+// top-level graphql package, but graphql/language/source uses instanceOf, and
+// has relatively few dependencies, so importing it here should not increase
+// bundle sizes as much as other options.
+import { remove } from 'ts-invariant/process';
+import { Source } from 'graphql';
+
+export function removeTemporaryGlobals() {
+  // Using Source here here just to make sure it won't be tree-shaken away.
+  return typeof Source === "function" ? remove() : remove();
+}

src/utilities/globals/index.ts

@@ -1,5 +1,13 @@
 import { invariant, newInvariantError, InvariantError } from "./invariantWrappers";
 
+// Import graphql/jsutils/instanceOf safely, working around its unchecked usage
+// of process.env.NODE_ENV and https://github.com/graphql/graphql-js/pull/2894.
+import { removeTemporaryGlobals } from "./fix-graphql";
+
+// Synchronously undo the global process.env.NODE_ENV polyfill that we created
+// temporarily while importing the offending graphql/jsutils/instanceOf module.
+removeTemporaryGlobals();
+
 export { maybe } from "./maybe";
 export { default as global } from "./global";
 export { invariant, newInvariantError, InvariantError }