Move WASM crates next to their consumer components (#34574)

* Move opaque_ke WASM crate next to its consumer component

Move opaque_ke from third_party/wasm/ to
components/brave_account/resources/opaque_ke/ so it lives
next to the component that consumes it.

- Move crate directory with index.js as-is
- Add workspace key to Cargo.toml for workspace discovery
- Update .cargo/config.toml vendor path
- Add transpile_web_ui target in resources/opaque_ke/BUILD.gn
- Update workspace Cargo.toml member path
- Update update.py to use make_config_toml for relative vendor paths

* Move candle_embedding_gemma WASM crate next to its consumer component

Move candle_embedding_gemma from third_party/wasm/ to
components/local_ai/resources/candle_embedding_gemma/ so it lives
next to the component that consumes it.

- Move crate directory
- Add workspace key to Cargo.toml for workspace discovery
- Update .cargo/config.toml vendor path
- Update workspace Cargo.toml member path
- Update update.py PRESERVE_PATTERNS for new config location

components/brave_account/resources/opaque_ke/.cargo/config.toml

@@ -2,4 +2,4 @@
 replace-with = "vendored-sources"
 
 [source.vendored-sources]
-directory = "../vendor"
+directory = "../../../../third_party/wasm/vendor"

components/brave_account/resources/opaque_ke/BUILD.gn

@@ -0,0 +1,28 @@
+# Copyright (c) 2026 The Brave Authors. All rights reserved.
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at https://mozilla.org/MPL/2.0/.
+
+import("//brave/components/common/typescript.gni")
+
+transpile_web_ui("opaque_ke") {
+  resource_name = "opaque_ke"
+  generate_grdp = true
+  resource_path_prefix = "brave"
+
+  entry_points = [ [
+        "opaque_ke",
+        rebase_path("index.js"),
+      ] ]
+
+  inputs = [
+    rebase_path("//brave/third_party/wasm/Cargo.lock"),
+    rebase_path("src/lib.rs"),
+  ]
+
+  imports_from = [ "//brave/components/brave_account/resources/opaque_ke/" ]
+
+  rust_packages = [ rebase_path("Cargo.toml") ]
+
+  public_asset_path = "chrome://resources/brave/"
+}

components/brave_account/resources/opaque_ke/Cargo.toml

@@ -2,6 +2,7 @@
 name = "opaque-ke-wasm"
 version = "0.1.0"
 edition = "2021"
+workspace = "../../../../third_party/wasm"
 
 [lib]
 crate-type = ["cdylib"]

components/brave_account/resources/opaque_ke/index.js

@@ -6,4 +6,4 @@
 export {
   Login,
   Registration,
-} from 'gen/brave/third_party/wasm/opaque_ke/bundler/pkg'
+} from 'gen/brave/components/brave_account/resources/opaque_ke/bundler/pkg'

components/local_ai/resources/candle_embedding_gemma/.cargo/config.toml

@@ -2,7 +2,7 @@
 replace-with = "vendored-sources"
 
 [source.vendored-sources]
-directory = "../vendor"
+directory = "../../../../third_party/wasm/vendor"
 
 [target.wasm32-unknown-unknown]
 rustflags = [

components/local_ai/resources/candle_embedding_gemma/Cargo.toml

@@ -2,6 +2,7 @@
 name = "candle_embedding_gemma"
 version = "0.1.0"
 edition = "2021"
+workspace = "../../../../third_party/wasm"
 
 [lib]
 crate-type = ["cdylib"]

third_party/wasm/Cargo.toml

@@ -1,3 +1,6 @@
 [workspace]
 resolver = "2"
-members = ["opaque_ke", "candle_embedding_gemma"]
+members = [
+  "../../components/brave_account/resources/opaque_ke",
+  "../../components/local_ai/resources/candle_embedding_gemma",
+]

third_party/wasm/update.py

@@ -19,7 +19,6 @@ import toml
 import brave_chromium_utils
 
 PRESERVE_PATTERNS = [
-    'candle_embedding_gemma/.cargo/config.toml',
     'vendor/.clang-format',
     'vendor/*/README.chromium',
 ]
@@ -55,30 +54,37 @@ def clean_up_files(patterns):
             path.unlink()
 
 
+def make_config_toml(member):
+    """Build a cargo config that points to the shared vendor dir."""
+    vendor_rel = os.path.relpath('vendor', member)
+    vendor_rel = vendor_rel.replace(os.sep, '/')
+    return {
+        'source': {
+            'crates-io': {
+                'replace-with': 'vendored-sources'
+            },
+            'vendored-sources': {
+                'directory': vendor_rel
+            }
+        }
+    }
+
+
 with brave_chromium_utils.sys_path('//tools/rust'):
     import update_rust
     CARGO = os.path.join(update_rust.RUST_TOOLCHAIN_OUT_DIR, 'bin',
                          'cargo' + ('.exe' if sys.platform == 'win32' else ''))
 
-CONFIG_TOML = {
-    'source': {
-        'crates-io': {
-            'replace-with': 'vendored-sources'
-        },
-        'vendored-sources': {
-            'directory': '../vendor'
-        }
-    }
-}
-
 
 def main():
     os.chdir(os.path.dirname(os.path.realpath(__file__)))
 
-    backed_up_files = back_up_files(PRESERVE_PATTERNS)
-
     members = toml.load('Cargo.toml')['workspace']['members']
 
+    preserve = ([f'{m}/.cargo/config.toml'
+                 for m in members] + PRESERVE_PATTERNS)
+    backed_up_files = back_up_files(preserve)
+
     shutil.rmtree('vendor', ignore_errors=True)
     for member in members:
         Path(f'{member}/.cargo/config.toml').unlink(missing_ok=True)
@@ -87,7 +93,7 @@ def main():
     for member in members:
         Path(f'{member}/.cargo').mkdir(exist_ok=True)
         with open(Path(f'{member}/.cargo/config.toml'), 'w') as f:
-            toml.dump(CONFIG_TOML, f)
+            toml.dump(make_config_toml(member), f)
 
     restore_files(backed_up_files)
     clean_up_files(CLEANUP_PATTERNS)

ui/webui/resources/BUILD.gn

@@ -29,8 +29,8 @@ group("grdp") {
     ":fonts_grdp",
     ":icons_grdp",
     ":leo_bundle",
-    ":opaque_ke",
     ":static_grdp",
+    "//brave/components/brave_account/resources/opaque_ke",
   ]
   if (include_polymer) {
     public_deps += [ ":build_grdp" ]
@@ -104,29 +104,6 @@ transpile_web_ui("leo_bundle") {
   resource_name = "leo"
 }
 
-transpile_web_ui("opaque_ke") {
-  resource_name = "opaque_ke"
-  generate_grdp = true
-  resource_path_prefix = "brave"
-
-  entry_points = [ [
-        "opaque_ke",
-        rebase_path("//brave/third_party/wasm/opaque_ke/index.js"),
-      ] ]
-
-  inputs = [
-    rebase_path("//brave/third_party/wasm/Cargo.lock"),
-    rebase_path("//brave/third_party/wasm/opaque_ke/src/lib.rs"),
-  ]
-
-  imports_from = [ "//brave/third_party/wasm/" ]
-
-  rust_packages =
-      [ rebase_path("//brave/third_party/wasm/opaque_ke/Cargo.toml") ]
-
-  public_asset_path = "chrome://resources/brave/"
-}
-
 # Create a grdp that //ui/webui/resources can include in its main resources GRD
 generate_grd("static_grdp") {
   grd_prefix = "brave_webui"