[typespec-java] Remove js-yaml and lodash

.chronus/changes/remove-js-yaml-lodash-typespec-java-2026-7-10-0-0-0.md

@@ -0,0 +1,7 @@
+---
+changeKind: dependencies
+packages:
+  - "@azure-tools/typespec-java"
+---
+
+[Java] Remove unused `js-yaml` and `lodash` dependencies.

packages/typespec-java/CONTRIBUTING.md

@@ -37,17 +37,48 @@ refresh `core.patch` if its context no longer applies.
 ## Build
 
 ```bash
-# Full build: build:generator (emitter.jar via Maven + core.patch, requires JDK 11+
-# and Maven) then build:emitter (copy sources from core + tsc).
-pnpm build
+# From the repo root, install workspace dependencies.
+pnpm install
 
-# Just the TypeScript half (no jar; fast):
-pnpm build:emitter
+# From the repo root, build the dependencies first. The ^... filter builds
+# @azure-tools/typespec-java dependencies without building typespec-java itself.
+pnpm turbo run --filter "@azure-tools/typespec-java^..." build
 
-# Build and pack a .tgz (what emitter-tests consumes):
+# Then build and pack @azure-tools/typespec-java. This builds the generator
+# (emitter.jar via Maven + core.patch, requires JDK 11+ and Maven), builds the
+# emitter TypeScript, and packs the .tgz consumed by emitter-tests.
+cd packages/typespec-java
 pwsh ./Build-TypeSpec.ps1
 ```
 
+### Pinning the core commit (`core-commit.json`)
+
+`Copy-Sources.ps1` copies the emitter sources from the `core/` submodule's current checkout. The
+optional `core-commit.json` pins a specific upstream `core` commit to copy from instead:
+
+```json
+{ "sha": "3cb616e4e8c3d5b6954bac9832b97445450a71af" }
+```
+
+The pinned SHA is fetched if needed and used only when it is **newer** than the current checkout (the
+submodule never moves backwards). The submodule is checked out transiently for the copy, then always
+restored to its original SHA, keeping `pnpm build` and CI git-status checks clean. To advance the pin,
+update the `sha`.
+
+### Troubleshooting
+
+If `pnpm turbo ...` fails with `'turbo' is not recognized as an internal or external command`
+after `pnpm install`, the local install tree is missing Turbo's binary shim. From the repo root,
+force pnpm to refresh the local install state and rerun the command:
+
+```powershell
+pnpm install --force
+pnpm turbo run --filter "@azure-tools/typespec-java^..." build
+```
+
+Changing the npm registry has been observed to clear this symptom, possibly because
+pnpm re-resolves packages or relinks local binaries after the registry setting changes.
+
 ## Before making a Pull request
 
 Make sure to run the following commands:

packages/typespec-java/package.json

@@ -64,8 +64,6 @@
   "dependencies": {
     "@autorest/codemodel": "catalog:",
     "@azure-tools/codegen": "catalog:",
-    "js-yaml": "catalog:",
-    "lodash": "catalog:",
     "yaml": "catalog:"
   },
   "devDependencies": {
@@ -76,8 +74,6 @@
     "@azure-tools/typespec-client-generator-core": "workspace:^",
     "@azure-tools/typespec-liftr-base": "catalog:",
     "@azure-tools/openai-typespec": "catalog:",
-    "@types/js-yaml": "catalog:",
-    "@types/lodash": "catalog:",
     "@types/node": "catalog:",
     "@typespec/compiler": "workspace:^",
     "@typespec/events": "workspace:^",

pnpm-workspace.yaml

@@ -82,8 +82,6 @@ catalog:
   "@types/debounce": ^1.2.4
   "@types/express": ^5.0.6
   "@types/hast": ^3.0.4
-  "@types/js-yaml": ~4.0.9
-  "@types/lodash": ~4.17.24
   "@types/micromatch": ^4.0.10
   "@types/morgan": ^1.9.10
   "@types/multer": ^2.1.0
@@ -142,8 +140,6 @@ catalog:
   happy-dom: ^20.9.0
   hast-util-to-html: ^9.0.5
   is-unicode-supported: ^2.1.0
-  js-yaml: ^4.2.0
-  lodash: ~4.18.1
   log-symbols: ^7.0.1
   lzutf8: "0.6.3"
   micromatch: ^4.0.8