Use simpler build backends for Python tooling

.github/workflows/ci.yaml

@@ -1067,15 +1067,15 @@ jobs:
           save-if: ${{ github.ref == 'refs/heads/main' }}
       - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
-          node-version: 24
+          node-version: 24.19.0
           cache: "npm"
           cache-dependency-path: playground/package-lock.json
       - uses: jetli/wasm-bindgen-action@20b33e20595891ab1a0ed73145d8a21fc96e7c29 # v0.2.0
       - name: "Install Node dependencies"
         run: npm ci --ignore-scripts
         working-directory: playground
       - name: "Build playgrounds"
-        run: npm run dev:wasm
+        run: npm run dev:build
         working-directory: playground
       - name: "Run TypeScript checks"
         run: npm run check

.github/workflows/publish-playground.yml

@@ -37,7 +37,7 @@ jobs:
         run: rustup target add wasm32-unknown-unknown
       - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
-          node-version: 24
+          node-version: 24.19.0
           package-manager-cache: false
       - uses: jetli/wasm-bindgen-action@20b33e20595891ab1a0ed73145d8a21fc96e7c29 # v0.2.0
       - name: "Install Node dependencies"

.github/workflows/publish-ty-playground.yml

@@ -40,7 +40,7 @@ jobs:
         run: rustup target add wasm32-unknown-unknown
       - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
-          node-version: 24
+          node-version: 24.19.0
           package-manager-cache: false
       - uses: jetli/wasm-bindgen-action@20b33e20595891ab1a0ed73145d8a21fc96e7c29 # v0.2.0
       - name: "Install Node dependencies"

.github/workflows/publish-versions.yml

@@ -78,4 +78,5 @@ jobs:
         run: |
           # Wait for PR to be created before merging
           sleep 10
-          gh pr merge --squash "$BRANCH_NAME"
+          # Use admin to bypass required review
+          gh pr merge --squash --admin "$BRANCH_NAME"

playground/.npmrc

@@ -1 +1,3 @@
+engine-strict = true
+ignore-scripts = true
 min-release-age = 7

playground/README.md

@@ -4,17 +4,18 @@ In-browser playground for Ruff. Available [https://play.ruff.rs/](https://play.r
 
 ## Getting started
 
+Use npm 11.10.0 or newer so that the dependency cooldown in `.npmrc` is enforced.
+
 Install the NPM dependencies with `npm ci --ignore-scripts`, and run the development server with
 `npm start --workspace ruff-playground` or `npm start --workspace ty-playground`.
 You may need to restart the server after making changes to Ruff or ty to re-build the WASM
 module.
 
 To run the datastore, which is based
 on [Workers KV](https://developers.cloudflare.com/workers/runtime-apis/kv/),
-install the [Wrangler CLI](https://developers.cloudflare.com/workers/wrangler/install-and-update/),
-then run `npx wrangler@4.118.0 dev --local` from the `./playground/api` directory. Note that the datastore
-is
-only required to generate shareable URLs for code snippets. The development datastore does not
+run `npm ci --ignore-scripts` and `npm start -- --local` from the `./playground/api` directory
+to use the locked [Wrangler CLI](https://developers.cloudflare.com/workers/wrangler/install-and-update/).
+The datastore is only required to generate shareable URLs for code snippets. The development datastore does not
 require Cloudflare authentication or login, but in turn only persists data locally.
 
 ## Architecture

playground/api/.npmrc

@@ -1 +1,3 @@
+engine-strict = true
+ignore-scripts = true
 min-release-age = 7

playground/api/package.json

@@ -1,6 +1,9 @@
 {
   "name": "api",
   "version": "0.0.0",
+  "engines": {
+    "npm": ">=11.10.0"
+  },
   "devDependencies": {
     "@cloudflare/workers-types": "^5.0.0",
     "miniflare": "^4.20260706.0",

playground/package.json

@@ -3,6 +3,9 @@
   "private": true,
   "version": "0.0.0",
   "type": "module",
+  "engines": {
+    "npm": ">=11.10.0"
+  },
   "scripts": {
     "check": "npm run dev:wasm && npm run lint && npm run tsc",
     "dev:wasm": "npm run dev:wasm --workspace ty-playground && npm run dev:wasm --workspace ruff-playground",

playground/ruff/package.json

@@ -4,14 +4,11 @@
   "version": "0.0.0",
   "type": "module",
   "scripts": {
-    "prebuild": "npm run build:wasm",
-    "build": "vite build",
+    "build": "npm run build:wasm && vite build",
     "build:wasm": "wasm-pack build ../../crates/ruff_wasm --target web --out-dir ../../playground/ruff/ruff_wasm",
     "dev:wasm": "wasm-pack build ../../crates/ruff_wasm --dev --target web --out-dir ../../playground/ruff/ruff_wasm",
-    "predev:build": "npm run dev:wasm",
-    "dev:build": "vite build",
-    "prestart": "npm run dev:wasm",
-    "start": "vite",
+    "dev:build": "npm run dev:wasm && vite build",
+    "start": "npm run dev:wasm && vite",
     "preview": "vite preview"
   },
   "dependencies": {

playground/ty/package.json

@@ -4,14 +4,11 @@
   "version": "0.0.0",
   "type": "module",
   "scripts": {
-    "prebuild": "npm run build:wasm",
-    "build": "vite build",
+    "build": "npm run build:wasm && vite build",
     "build:wasm": "wasm-pack build ../../crates/ty_wasm --target web --out-dir ../../playground/ty/ty_wasm",
     "dev:wasm": "wasm-pack build ../../crates/ty_wasm --dev --target web --out-dir ../../playground/ty/ty_wasm",
-    "predev:build": "npm run dev:wasm",
-    "dev:build": "vite build",
-    "prestart": "npm run dev:wasm",
-    "start": "vite",
+    "dev:build": "npm run dev:wasm && vite build",
+    "start": "npm run dev:wasm && vite",
     "preview": "vite preview"
   },
   "dependencies": {

pyproject.toml

@@ -76,7 +76,7 @@ ruff-lsp-test = [
     "packaging>=23.1",
     # ruff-lsp uses the pygls 1.x server API.
     "pygls>=1.1.0,<2",
-    "pytest>=7.3.1,<8",
+    "pytest>=9.0.3,<10",
     "pytest-asyncio>=0.21.2",
     "python-lsp-jsonrpc>=1.0.0",
     "typing-extensions>=4.7.1",
@@ -92,6 +92,35 @@ typeshed-formatting = [
 ]
 
 [tool.uv]
+no-build = true
+# CI installs the local ecosystem runner and tools pinned to Git revisions.
+no-binary-package = [
+    "black",
+    "docstring-adder",
+    "ecosystem-analyzer",
+    "mypy-primer",
+    "ruff-ecosystem",
+    "typeshed-client",
+]
+# Pin the isolated build environment for source-build exceptions.
+build-constraint-dependencies = [
+    "editables==0.6",
+    "hatch-fancy-pypi-readme==25.1.0",
+    "hatch-vcs==0.5.0",
+    "hatchling==1.32.0",
+    "packaging==26.3",
+    "pathspec==1.1.1",
+    "pluggy==1.6.0",
+    "setuptools==84.0.0",
+    "setuptools-scm==10.2.1",
+    "tomli==2.4.1; python_version < '3.11'",
+    "tomlkit==0.15.1",
+    "trove-classifiers==2026.6.1.19",
+    "typing-extensions==4.16.0; python_version < '3.11'",
+    "uv-build==0.12.3",
+    "vcs-versioning==2.2.4",
+    "wheel==0.47.0",
+]
 exclude-newer = "P7D"
 
 [tool.uv.dependency-groups]

python/py-fuzzer/pyproject.toml

@@ -1,6 +1,7 @@
 [project]
 name = "py-fuzzer"
 version = "0.0.0"
+description = "Run Ruff or ty on randomly generated Python source files."
 readme = "README.md"
 requires-python = ">=3.12"
 dependencies = [
@@ -15,14 +16,14 @@ dependencies = [
 fuzz = "fuzz:main"
 
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+requires = ["flit-core>=3.12,<4"]
+build-backend = "flit_core.buildapi"
 
 [dependency-groups]
 dev = ["mypy", "ruff", "ty"]
 
-[tool.hatch.build.targets.wheel]
-include = ["fuzz.py"]
+[tool.flit.module]
+name = "fuzz"
 
 [tool.mypy]
 files = "fuzz.py"
@@ -80,4 +81,8 @@ combine-as-imports = true
 split-on-trailing-comma = false
 
 [tool.uv]
+no-build = true
+no-binary-package = ["py-fuzzer"]
+# Pin the isolated build environment for source-build exceptions.
+build-constraint-dependencies = ["flit-core==3.12.0"]
 exclude-newer = "P7D"

python/ruff-ecosystem/pyproject.toml

@@ -1,6 +1,6 @@
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+requires = ["uv_build>=0.12.3,<0.13"]
+build-backend = "uv_build"
 
 [project]
 name = "ruff-ecosystem"
@@ -14,3 +14,12 @@ ruff-ecosystem = "ruff_ecosystem.cli:entrypoint"
 [tool.ruff.lint]
 ignore = ["T100"]
 preview = true
+
+[tool.uv]
+no-build = true
+no-binary-package = ["ruff-ecosystem"]
+# Pin the isolated build environment for source-build exceptions.
+build-constraint-dependencies = ["uv-build==0.12.3"]
+
+[tool.uv.build-backend]
+module-root = ""

scripts/add_plugin.py

@@ -5,6 +5,7 @@
 # dependencies = []
 #
 # [tool.uv]
+# no-build = true
 # exclude-newer = "P7D"
 # ///
 

scripts/add_rule.py

@@ -5,6 +5,7 @@
 # dependencies = []
 #
 # [tool.uv]
+# no-build = true
 # exclude-newer = "P7D"
 # ///
 

scripts/benchmarks/pyproject.toml

@@ -25,4 +25,5 @@ linter = [
 ]
 
 [tool.uv]
+no-build = true
 exclude-newer = "P7D"

scripts/build_ruff_pgo.py

@@ -5,6 +5,7 @@
 # dependencies = []
 #
 # [tool.uv]
+# no-build = true
 # exclude-newer = "P7D"
 # ///
 

scripts/bump-workspace-crate-versions.py

@@ -10,6 +10,7 @@
 # dependencies = []
 #
 # [tool.uv]
+# no-build = true
 # exclude-newer = "P7D"
 # ///
 

scripts/check_docs_formatted.py

@@ -5,6 +5,7 @@
 # dependencies = ["ruff"]
 #
 # [tool.uv]
+# no-build = true
 # exclude-newer = "P7D"
 # ///
 

scripts/collect_ty_ecosystem_run_metadata.py

@@ -5,6 +5,7 @@
 # dependencies = []
 #
 # [tool.uv]
+# no-build = true
 # exclude-newer = "P7D"
 # ///
 

scripts/conformance.py

@@ -3,6 +3,7 @@
 # dependencies = []
 #
 # [tool.uv]
+# no-build = true
 # exclude-newer = "P7D"
 # ///
 

scripts/ecosystem_all_check.py

@@ -3,6 +3,7 @@
 # dependencies = ["tqdm"]
 #
 # [tool.uv]
+# no-build = true
 # exclude-newer = "P7D"
 # ///
 

scripts/generate-crate-readmes.py

@@ -3,6 +3,7 @@
 # dependencies = []
 #
 # [tool.uv]
+# no-build = true
 # exclude-newer = "P7D"
 # ///
 

scripts/generate_builtin_modules.py

@@ -3,6 +3,7 @@
 # dependencies = []
 #
 # [tool.uv]
+# no-build = true
 # exclude-newer = "P7D"
 # ///
 

scripts/generate_known_standard_library.py

@@ -3,6 +3,7 @@
 # dependencies = ["stdlibs"]
 #
 # [tool.uv]
+# no-build = true
 # exclude-newer = "P7D"
 # ///
 

scripts/generate_mkdocs.py

@@ -7,6 +7,7 @@
 # ]
 #
 # [tool.uv]
+# no-build = true
 # exclude-newer = "P7D"
 # ///
 

scripts/memory_report.py

@@ -3,6 +3,7 @@
 # dependencies = []
 #
 # [tool.uv]
+# no-build = true
 # exclude-newer = "P7D"
 # ///
 

scripts/publish-crates.py

@@ -3,6 +3,7 @@
 # dependencies = []
 #
 # [tool.uv]
+# no-build = true
 # exclude-newer = "P7D"
 # ///
 

scripts/setup-crates-io-publish.py

@@ -22,6 +22,7 @@
 # dependencies = ["httpx"]
 #
 # [tool.uv]
+# no-build = true
 # exclude-newer = "P7D"
 # ///
 

scripts/setup_primer_project.py

@@ -5,6 +5,9 @@
 # dependencies = ["mypy-primer"]
 #
 # [tool.uv]
+# no-build = true
+# no-binary-package = ["mypy-primer"]
+# build-constraint-dependencies = ["setuptools==84.0.0"]
 # # This is the default for ad hoc use. Historical ecosystem reproduction must
 # # bypass the adjacent lock and select ecosystem-analyzer's exact mypy-primer
 # # revision and project Python version, as shown in the module docstring.