[9.3] fix stray .d.ts files from type_check in git worktrees (#269960) (#269998)

# Backport

This will backport the following commits from `main` to `9.3`:
- [fix stray .d.ts files from type_check in git worktrees
(#269960)](#269960)

<!--- Backport version: 9.6.6 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

<!--BACKPORT [{"author":{"name":"Tyler
Smalley","email":"tyler.smalley@elastic.co"},"sourceCommit":{"committedDate":"2026-05-19T15:54:02Z","message":"fix
stray .d.ts files from type_check in git worktrees
(#269960)\n\nWorktrees share `node_modules `with the primary checkout,
so\n`@kbn/repo-info` always resolved `REPO_ROOT` to the primary tree.
This\ncaused tsc to emit target/types artifacts there instead of the
active\nworktree.\n\nFix: prefer `process.cwd()` when it resolves to a
different kibana root\nthan `__dirname`. Also throw a clear error when
`--project` matches no\nknown project rather than silently falling back
to checking every\nproject.\n\nCloses
#269739","sha":"05ba1523a7940a890f002387797bfbb0e66a2369","branchLabelMapping":{"^v9.5.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:skip","backport:all-open","v9.5.0"],"title":"fix
stray .d.ts files from type_check in git
worktrees","number":269960,"url":"https://github.com/elastic/kibana/pull/269960","mergeCommit":{"message":"fix
stray .d.ts files from type_check in git worktrees
(#269960)\n\nWorktrees share `node_modules `with the primary checkout,
so\n`@kbn/repo-info` always resolved `REPO_ROOT` to the primary tree.
This\ncaused tsc to emit target/types artifacts there instead of the
active\nworktree.\n\nFix: prefer `process.cwd()` when it resolves to a
different kibana root\nthan `__dirname`. Also throw a clear error when
`--project` matches no\nknown project rather than silently falling back
to checking every\nproject.\n\nCloses
#269739","sha":"05ba1523a7940a890f002387797bfbb0e66a2369"}},"sourceBranch":"main","suggestedTargetBranches":[],"targetPullRequestStates":[{"branch":"main","label":"v9.5.0","branchLabelMappingKey":"^v9.5.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/269960","number":269960,"mergeCommit":{"message":"fix
stray .d.ts files from type_check in git worktrees
(#269960)\n\nWorktrees share `node_modules `with the primary checkout,
so\n`@kbn/repo-info` always resolved `REPO_ROOT` to the primary tree.
This\ncaused tsc to emit target/types artifacts there instead of the
active\nworktree.\n\nFix: prefer `process.cwd()` when it resolves to a
different kibana root\nthan `__dirname`. Also throw a clear error when
`--project` matches no\nknown project rather than silently falling back
to checking every\nproject.\n\nCloses
#269739","sha":"05ba1523a7940a890f002387797bfbb0e66a2369"}}]}]
BACKPORT-->

Co-authored-by: Tyler Smalley <tyler.smalley@elastic.co>

Author: kibanamachine

packages/kbn-ts-type-check-cli/run_type_check_legacy_cli.ts

@@ -63,6 +63,10 @@ export const runLegacyTypeCheckCli = () => {
           !project.isTypeCheckDisabled() && (!projectFilter || project.path === projectFilter)
       );
 
+      if (projectFilter && projects.length === 0) {
+        throw createFailError(`Could not find a TypeScript project at '${projectFilter}'.`);
+      }
+
       const createdConfigs = await createTypeCheckConfigs(log, projects, TS_PROJECTS);
       let tscFailed = false;
       try {

src/platform/packages/shared/kbn-repo-info/index.js

@@ -31,11 +31,11 @@ const readKibanaPkgJson = (path) => {
   }
 };
 
-const findKibanaPackageJson = () => {
-  // search for the kibana directory, since this file is moved around it might
-  // not be where we think but should always be a relatively close parent
-  // of this directory
-  const startDir = __dirname;
+/**
+ * @param {string} startDir
+ * @returns {{ kibanaDir: string, kibanaPkgJson: KibanaPackageJson } | undefined}
+ */
+const searchForKibanaPackageJson = (startDir) => {
   const { root: rootDir } = Path.parse(startDir);
   let cursor = startDir;
   while (true) {
@@ -53,12 +53,31 @@ const findKibanaPackageJson = () => {
 
     const parent = Path.dirname(cursor);
     if (parent === rootDir) {
-      throw new Error(`unable to find kibana directory from ${startDir}`);
+      return undefined;
     }
     cursor = parent;
   }
 };
 
+const findKibanaPackageJson = () => {
+  // In a git worktree, node_modules are shared with the primary worktree, so __dirname
+  // always resolves into the primary worktree's tree. Check process.cwd() first: if it
+  // is inside a *different* kibana root, prefer that root so REPO_ROOT matches the active
+  // working tree rather than the primary checkout.
+  const cwdResult = searchForKibanaPackageJson(process.cwd());
+  const dirnameResult = searchForKibanaPackageJson(__dirname);
+
+  if (!dirnameResult) {
+    throw new Error(`unable to find kibana directory from ${__dirname}`);
+  }
+
+  if (cwdResult && cwdResult.kibanaDir !== dirnameResult.kibanaDir) {
+    return cwdResult;
+  }
+
+  return dirnameResult;
+};
+
 const { kibanaDir, kibanaPkgJson } = findKibanaPackageJson();
 
 const REPO_ROOT = kibanaDir;