From 4d9ed144e4a6d4e7bb81f743e39e66774532c8f1 Mon Sep 17 00:00:00 2001
From: Diego Muracciole <diegomuracciole@gmail.com>
Date: Mon, 24 Aug 2026 00:25:14 +0200
Subject: [PATCH] fix(render): drop fork-only initDeflate call in checkbox
 appearance streams

Upstream pdfkit's PDFReference compresses automatically in finalize();
initDeflate only existed in the @react-pdf/pdfkit fork.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
---
 .changeset/forms-initdeflate-fix.md                 | 5 +++++
 packages/render/src/utils/parseFormOptions.ts       | 2 --
 packages/render/tests/primitives/renderForm.test.ts | 1 -
 3 files changed, 5 insertions(+), 3 deletions(-)
 create mode 100644 .changeset/forms-initdeflate-fix.md

diff --git a/.changeset/forms-initdeflate-fix.md b/.changeset/forms-initdeflate-fix.md
new file mode 100644
index 000000000..5bf4e141e
--- /dev/null
+++ b/.changeset/forms-initdeflate-fix.md
@@ -0,0 +1,5 @@
+---
+'@react-pdf/render': patch
+---
+
+Fix `appearance.initDeflate is not a function` when rendering checkboxes with upstream pdfkit
diff --git a/packages/render/src/utils/parseFormOptions.ts b/packages/render/src/utils/parseFormOptions.ts
index 991aeb28a..6887a1479 100644
--- a/packages/render/src/utils/parseFormOptions.ts
+++ b/packages/render/src/utils/parseFormOptions.ts
@@ -75,8 +75,6 @@ const getAppearance = (
     },
   });
 
-  appearance.initDeflate();
-
   appearance.write(
     `/Tx BMC\nq\n/ZaDi ${height * 0.8} Tf\nBT\n${width * 0.45} ${
       height / 4
diff --git a/packages/render/tests/primitives/renderForm.test.ts b/packages/render/tests/primitives/renderForm.test.ts
index d3dcd89c2..188d72536 100644
--- a/packages/render/tests/primitives/renderForm.test.ts
+++ b/packages/render/tests/primitives/renderForm.test.ts
@@ -82,7 +82,6 @@ describe('primitive renderCheckbox', () => {
     const ctx = createCTX();
     ctx._acroform = { fonts: {} };
     ctx.ref = vi.fn(() => ({
-      initDeflate: vi.fn(),
       write: vi.fn(),
       end: vi.fn(),
     }));