Add reset method to print, hook up to ApolloCache.gc

.changeset/wild-dolphins-jog.md

@@ -0,0 +1,5 @@
+---
+"@apollo/client": patch
+---
+
+Add `reset` method to `print`, hook up to `ApolloCache.gc`

src/cache/inmemory/inMemoryCache.ts

@@ -17,6 +17,7 @@ import {
   isReference,
   DocumentTransform,
   canonicalStringify,
+  print,
 } from "../../utilities/index.js";
 import type { InMemoryCacheConfig, NormalizedCacheObject } from "./types.js";
 import { StoreReader } from "./readFromStore.js";
@@ -293,6 +294,7 @@ export class InMemoryCache extends ApolloCache<NormalizedCacheObject> {
     resetResultIdentities?: boolean;
   }) {
     canonicalStringify.reset();
+    print.reset();
     const ids = this.optimisticData.gc();
     if (options && !this.txCount) {
       if (options.resetResultCache) {

src/utilities/graphql/print.ts

@@ -1,14 +1,25 @@
+import type { ASTNode } from "graphql";
 import { print as origPrint } from "graphql";
 import { canUseWeakMap } from "../common/canUse.js";
 
-const printCache = canUseWeakMap ? new WeakMap() : undefined;
-export const print: typeof origPrint = (ast) => {
-  let result;
-  result = printCache?.get(ast);
+let printCache: undefined | WeakMap<ASTNode, string>;
+// further TODO: replace with `optimism` with a `WeakCache` once those are available
+export const print = Object.assign(
+  (ast: ASTNode) => {
+    let result;
+    result = printCache?.get(ast);
 
-  if (!result) {
-    result = origPrint(ast);
-    printCache?.set(ast, result);
+    if (!result) {
+      result = origPrint(ast);
+      printCache?.set(ast, result);
+    }
+    return result;
+  },
+  {
+    reset() {
+      printCache = canUseWeakMap ? new WeakMap() : undefined;
+    },
   }
-  return result;
-};
+);
+
+print.reset();