From 95f7156fd4a0681f8021559657bd97f29ebc73ae Mon Sep 17 00:00:00 2001
From: Jovi De Croock <decroockjovi@gmail.com>
Date: Fri, 9 Dec 2022 17:37:01 +0100
Subject: [PATCH] fix(core): Fix regression causing stringifyDocument to not
 reprint after formatDocument (#2871)

Co-authored-by: Phil Pluckthun <phil@kitten.sh>
---
 .changeset/large-eggs-cough.md                |  5 +++
 packages/core/src/utils/request.test.ts       | 39 ++++++++++++++++++-
 packages/core/src/utils/request.ts            | 21 +++++-----
 .../svelte-urql/src/mutationStore.test.ts     |  3 +-
 4 files changed, 56 insertions(+), 12 deletions(-)
 create mode 100644 .changeset/large-eggs-cough.md

diff --git a/.changeset/large-eggs-cough.md b/.changeset/large-eggs-cough.md
new file mode 100644
index 0000000000..0809304ea6
--- /dev/null
+++ b/.changeset/large-eggs-cough.md
@@ -0,0 +1,5 @@
+---
+'@urql/core': patch
+---
+
+Fix regression in `@urql/core`'s `stringifyDocument` that caused some formatted documents to not be reprinted.
diff --git a/packages/core/src/utils/request.test.ts b/packages/core/src/utils/request.test.ts
index 0d0142685d..1ef3cdd145 100644
--- a/packages/core/src/utils/request.test.ts
+++ b/packages/core/src/utils/request.test.ts
@@ -92,6 +92,43 @@ describe('stringifyDocument ', () => {
     expect(stringifyDocument(formatted)).toBe(print(formatted));
   });
 
+  it('should reprint request documents', () => {
+    const request = createRequest(`query { test { field } }`, {});
+    const formatted = formatDocument(request.query);
+    expect(print(formatted)).toMatchInlineSnapshot(`
+      "{
+        test {
+          field
+          __typename
+        }
+      }"
+    `);
+    expect(stringifyDocument(formatted)).toBe(print(formatted));
+  });
+
+  it('should reprint gql documents', () => {
+    const request = createRequest(
+      gql`
+        query {
+          test {
+            field
+          }
+        }
+      `,
+      {}
+    );
+    const formatted = formatDocument(request.query);
+    expect(print(formatted)).toMatchInlineSnapshot(`
+      "{
+        test {
+          field
+          __typename
+        }
+      }"
+    `);
+    expect(stringifyDocument(formatted)).toBe(print(formatted));
+  });
+
   it('should remove comments', () => {
     const doc = `
       { #query
@@ -132,7 +169,6 @@ describe('stringifyDocument ', () => {
       .toMatchInlineSnapshot(`
         "{
           field(arg: 
-
         \\"test #1\\")
         }"
       `);
@@ -153,7 +189,6 @@ describe('stringifyDocument ', () => {
       .toMatchInlineSnapshot(`
         "{
           field(arg: 
-
         \\"\\"\\"
           hello
           #hello
diff --git a/packages/core/src/utils/request.ts b/packages/core/src/utils/request.ts
index 8c3d77e278..3b9d907103 100644
--- a/packages/core/src/utils/request.ts
+++ b/packages/core/src/utils/request.ts
@@ -29,16 +29,21 @@ const replaceOutsideStrings = (str: string, idx: number) =>
 const sanitizeDocument = (node: string): string =>
   node.split(GRAPHQL_STRING_RE).map(replaceOutsideStrings).join('').trim();
 
+const prints = new Map<DocumentNode | DefinitionNode, string>();
+const docs = new Map<HashValue, KeyedDocumentNode>();
+
 export const stringifyDocument = (
   node: string | DefinitionNode | DocumentNode
 ): string => {
-  const printed = sanitizeDocument(
-    typeof node === 'string'
-      ? node
-      : node.loc && node.loc.source.name === SOURCE_NAME
-      ? node.loc.source.body
-      : print(node)
-  );
+  let printed: string;
+  if (typeof node === 'string') {
+    printed = sanitizeDocument(node);
+  } else if (node.loc && docs.get((node as KeyedDocumentNode).__key) === node) {
+    printed = node.loc.source.body;
+  } else {
+    printed = prints.get(node) || sanitizeDocument(print(node));
+    prints.set(node, printed);
+  }
 
   if (typeof node !== 'string' && !node.loc) {
     (node as WritableLocation).loc = {
@@ -67,8 +72,6 @@ const hashDocument = (
   return key;
 };
 
-const docs = new Map<HashValue, KeyedDocumentNode>();
-
 export const keyDocument = (node: string | DocumentNode): KeyedDocumentNode => {
   let key: HashValue;
   let query: DocumentNode;
diff --git a/packages/svelte-urql/src/mutationStore.test.ts b/packages/svelte-urql/src/mutationStore.test.ts
index 8c47ab39ce..4fb129d5af 100644
--- a/packages/svelte-urql/src/mutationStore.test.ts
+++ b/packages/svelte-urql/src/mutationStore.test.ts
@@ -1,3 +1,4 @@
+import { print } from 'graphql';
 import { createClient } from '@urql/core';
 import { get } from 'svelte/store';
 import { vi, expect, it, describe } from 'vitest';
@@ -28,7 +29,7 @@ describe('mutationStore', () => {
     expect(get(store).operation.context.url).toBe('https://example.com');
     expect(get(store).operation.variables).toBe(variables);
 
-    expect(get(store).operation.query.loc?.source.body).toMatchInlineSnapshot(`
+    expect(print(get(store).operation.query)).toMatchInlineSnapshot(`
       "mutation ($input: Example!) {
         doExample(input: $input) {
           id