[rush](package-deps-hash) Avoid defect to be produced when spawned "git hash-object" process stdin fails while computing repo-state

common/changes/@rushstack/package-deps-hash/avoid-getrepostate-to-crash_2024-01-11-09-03.json

@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@rushstack/package-deps-hash",
+      "comment": "Handle an edge case in `getRepoState` wherein it tries to asynchronously pipe data to `git hash-object` but the subprocess has already exited.",
+      "type": "patch"
+    }
+  ],
+  "packageName": "@rushstack/package-deps-hash"
+}

libraries/package-deps-hash/package.json

@@ -17,7 +17,6 @@
   },
   "devDependencies": {
     "@rushstack/heft": "workspace:*",
-    "@rushstack/node-core-library": "workspace:*",
     "local-node-rig": "workspace:*"
   },
   "dependencies": {

libraries/package-deps-hash/src/getRepoState.ts

@@ -3,7 +3,7 @@
 
 import type * as child_process from 'child_process';
 import { once } from 'events';
-import { Readable } from 'stream';
+import { Readable, pipeline } from 'stream';
 
 import { Executable, FileSystem, type IExecutableSpawnOptions } from '@rushstack/node-core-library';
 
@@ -282,7 +282,12 @@ async function spawnGitAsync(
   });
 
   if (stdin) {
-    stdin.pipe(proc.stdin!);
+    /**
+     * For `git hash-object` data is piped in asynchronously. In the event that one of the
+     * passed filenames cannot be hashed, subsequent writes to `proc.stdin` will error.
+     * Silence this error since it will be handled by the non-zero exit code of the process.
+     */
+    pipeline(stdin, proc.stdin!, (err) => {});
   }
 
   const [status] = await once(proc, 'exit');