wip

TODO.md

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+### tool resolutions
+
+- deterministic `node lts`
+- updateable
+
+```sql
+CREATE TABLE IF NOT EXISTS tool_resolutions (
+    tool TEXT NOT NULL,
+    version TEXT NOT NULL,
+    resolved TEXT NOT NULL,
+    PRIMARY KEY (tool, version)
+);
+```
+
+```console
+$ pre-commit tools autoupdate [--only ...]  # update config override versions
+$ pre-commit tools resolve [--only ...]  # update resolved versions
+```
+
+```yaml
+# in .pre-commit-config.yaml
+tool_resolution:
+    node: {lts: '24.2.0'}
+```

pre_commit/all_tools.py

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+from __future__ import annotations
+
+from pre_commit.tool_base import Tool
+from pre_commit.tools import go
+from pre_commit.tools import node
+from pre_commit.tools import python
+from pre_commit.tools import rbenv
+from pre_commit.tools import ruby
+from pre_commit.tools import rust
+from pre_commit.tools import rustup
+from pre_commit.tools import uv
+
+
+tools: dict[str, Tool] = {
+    'go': go,
+    'node': node,
+    'python': python,
+    'rbenv': rbenv,
+    'ruby': ruby,
+    'rust': rust,
+    'rustup': rustup,
+    'uv': uv,
+}

pre_commit/request.py

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+from __future__ import annotations
+
+import sys
+import urllib.request
+from typing import IO
+
+from pre_commit.constants import VERSION
+
+
+def fetch(url: str) -> IO[bytes]:
+    pyver = '.'.join(str(v) for v in sys.version_info[:3])
+    req = urllib.request.Request(
+        url,
+        headers={'User-Agent': f'pre-commit/{VERSION} python/{pyver}'},
+    )
+    return urllib.request.urlopen(req)

pre_commit/tool_base.py

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+from __future__ import annotations
+
+from typing import Protocol
+
+from pre_commit.prefix import Prefix
+
+
+class Tool(Protocol):
+    # "special" versions which can be resolved
+    @property
+    def RESOLVABLE(self) -> tuple[str, ...]: ...
+    # TODO: what if not resolvable? (no current examples?)
+    def resolve(self, version: str) -> str: ...
+    def install(self, prefix: Prefix, version: str) -> None: ...
+    def health_check(self, prefix: Prefix, version: str) -> str | None: ...
+    # TODO: how to env patch?

pre_commit/tools/node.py

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+from __future__ import annotations
+
+import functools
+import json
+
+from pre_commit.prefix import Prefix
+from pre_commit.request import fetch
+
+RESOLVABLE = ('latest', 'lts')
+
+
+@functools.cache
+def _node_versions() -> dict[str, str]:
+    resp = fetch('https://nodejs.org/download/release/index.json')
+    contents = json.load(resp)
+
+    ret = {'latest': contents[0]['version']}
+    for dct in contents:
+        if dct['lts']:
+            ret['lts'] = dct['version']
+            break
+    else:
+        raise AssertionError('unreachable')
+
+    return ret
+
+
+def resolve(version: str) -> str:
+    return _node_versions()[version]
+
+
+@functools.cache
+def _target_platform() -> str:
+    # to support:
+    # linux-arm64, linux-ppc64le, linux-s390x, linux-x64
+    # osx-arm64-tar, osx-x86-tar
+    # win-arm64-zip, win-x64-zip
+    # or fallback to `src` ?
+    raise NotImplementedError
+
+
+def install(prefix: Prefix, version: str) -> None:
+    # TODO: download and extract to prefix
+    raise NotImplementedError
+
+
+def health_check(prefix: Prefix, version: str) -> str | None:
+    # TODO: previously checked `node --version`
+    # TODO: but maybe just check that the installed os/arch is correct?
+    return None

pre_commit/tools/python.py

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+from __future__ import annotations
+
+# TODO: how to get "latest" supported uv python?
+# TODO: should this support `3.##` as resolvable?
+# TODO: how would dynamic resolvables work...