From fb4161b0320de0fc28578b44ed31f5890872eaff Mon Sep 17 00:00:00 2001
From: Chris Duncan <chris@zoso.dev>
Date: Sat, 5 Jul 2025 01:40:00 -0700
Subject: [PATCH] Optionally install browserfied Node buffer to enable LedgerJS
 libraries and update esbuild to inject it at build time.

---
 buffer.mjs          |  3 ++
 esbuild-browser.mjs |  1 +
 package-lock.json   | 70 ++++++++++++++++++++++++++++++++++++++++++++-
 package.json        |  3 +-
 4 files changed, 75 insertions(+), 2 deletions(-)
 create mode 100644 buffer.mjs

diff --git a/buffer.mjs b/buffer.mjs
new file mode 100644
index 0000000..c40ed3e
--- /dev/null
+++ b/buffer.mjs
@@ -0,0 +1,3 @@
+import buffer from 'buffer/'
+const Buffer = buffer.Buffer
+export { Buffer as 'Buffer' }
diff --git a/esbuild-browser.mjs b/esbuild-browser.mjs
index df0bb54..b42ff32 100644
--- a/esbuild-browser.mjs
+++ b/esbuild-browser.mjs
@@ -9,6 +9,7 @@ await build({
 	entryPoints: [
 		{ in: './src/main.ts', out: 'main.min' }
 	],
+	inject: ['./buffer.mjs'],
 	format: 'esm',
 	legalComments: 'inline',
 	outdir: 'dist',
diff --git a/package-lock.json b/package-lock.json
index 88fe6b3..eb12a8c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -26,7 +26,8 @@
 			"optionalDependencies": {
 				"@ledgerhq/hw-transport-web-ble": "^6.29.7",
 				"@ledgerhq/hw-transport-webhid": "^6.30.3",
-				"@ledgerhq/hw-transport-webusb": "^6.29.7"
+				"@ledgerhq/hw-transport-webusb": "^6.29.7",
+				"buffer": "^6.0.3"
 			}
 		},
 		"node_modules/@babel/code-frame": {
@@ -764,6 +765,27 @@
 				}
 			}
 		},
+		"node_modules/base64-js": {
+			"version": "1.5.1",
+			"resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
+			"integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==",
+			"funding": [
+				{
+					"type": "github",
+					"url": "https://github.com/sponsors/feross"
+				},
+				{
+					"type": "patreon",
+					"url": "https://www.patreon.com/feross"
+				},
+				{
+					"type": "consulting",
+					"url": "https://feross.org/support"
+				}
+			],
+			"license": "MIT",
+			"optional": true
+		},
 		"node_modules/basic-ftp": {
 			"version": "5.0.5",
 			"resolved": "https://registry.npmjs.org/basic-ftp/-/basic-ftp-5.0.5.tgz",
@@ -774,6 +796,31 @@
 				"node": ">=10.0.0"
 			}
 		},
+		"node_modules/buffer": {
+			"version": "6.0.3",
+			"resolved": "https://registry.npmjs.org/buffer/-/buffer-6.0.3.tgz",
+			"integrity": "sha512-FTiCpNxtwiZZHEZbcbTIcZjERVICn9yq/pDFkTl95/AxzD1naBctN7YO68riM/gLSDY7sdrMby8hofADYuuqOA==",
+			"funding": [
+				{
+					"type": "github",
+					"url": "https://github.com/sponsors/feross"
+				},
+				{
+					"type": "patreon",
+					"url": "https://www.patreon.com/feross"
+				},
+				{
+					"type": "consulting",
+					"url": "https://feross.org/support"
+				}
+			],
+			"license": "MIT",
+			"optional": true,
+			"dependencies": {
+				"base64-js": "^1.3.1",
+				"ieee754": "^1.2.1"
+			}
+		},
 		"node_modules/buffer-crc32": {
 			"version": "0.2.13",
 			"resolved": "https://registry.npmjs.org/buffer-crc32/-/buffer-crc32-0.2.13.tgz",
@@ -1181,6 +1228,27 @@
 				"node": ">= 14"
 			}
 		},
+		"node_modules/ieee754": {
+			"version": "1.2.1",
+			"resolved": "https://registry.npmjs.org/ieee754/-/ieee754-1.2.1.tgz",
+			"integrity": "sha512-dcyqhDvX1C46lXZcVqCpK+FtMRQVdIMN6/Df5js2zouUsqG7I6sFxitIC+7KYK29KdXOLHdu9zL4sFnoVQnqaA==",
+			"funding": [
+				{
+					"type": "github",
+					"url": "https://github.com/sponsors/feross"
+				},
+				{
+					"type": "patreon",
+					"url": "https://www.patreon.com/feross"
+				},
+				{
+					"type": "consulting",
+					"url": "https://feross.org/support"
+				}
+			],
+			"license": "BSD-3-Clause",
+			"optional": true
+		},
 		"node_modules/import-fresh": {
 			"version": "3.3.1",
 			"resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.3.1.tgz",
diff --git a/package.json b/package.json
index cbbbb49..cba35cd 100644
--- a/package.json
+++ b/package.json
@@ -63,7 +63,8 @@
 	"optionalDependencies": {
 		"@ledgerhq/hw-transport-web-ble": "^6.29.7",
 		"@ledgerhq/hw-transport-webhid": "^6.30.3",
-		"@ledgerhq/hw-transport-webusb": "^6.29.7"
+		"@ledgerhq/hw-transport-webusb": "^6.29.7",
+		"buffer": "^6.0.3"
 	},
 	"devDependencies": {
 		"@types/node": "^24.0.10",
-- 
2.47.3