Fix PowerShell installation (#16164)

JunielKatarn · web-flow · commit 673628ec13bb · 2026-05-20T14:16:25.000-07:00
* Defer findPowershell to layoutMSRNCxx

* Change files
diff --git a/change/react-native-windows-f139800b-c305-4d90-a3f6-8d348530a0ce.json b/change/react-native-windows-f139800b-c305-4d90-a3f6-8d348530a0ce.json
@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Defer findPowershell to layoutMSRNCxx",
+  "packageName": "react-native-windows",
+  "email": "julio.rocha@microsoft.com",
+  "dependentChangeType": "patch"
+}
diff --git a/vnext/just-task.js b/vnext/just-task.js
@@ -45,10 +45,9 @@ function codegen(test) {
   );
 }
 
-const powershell = findPowerShell();
-
 function layoutMSRNCxx() {
   if (require('os').platform() === 'win32') {
+    const powershell = findPowerShell();
     execSync(
       `"${powershell}" -NoProfile .\\Scripts\\Tfs\\Layout-MSRN-Headers.ps1 -GenerateLocalCxx`,
       {

Original file line number	Diff line number	Diff line change
`@@ -45,10 +45,9 @@ function codegen(test) {`
`45`	`45`	`);`
`46`	`46`	`}`
`47`	`47`
`48`		`-const powershell = findPowerShell();`
`49`		`-`
`50`	`48`	`function layoutMSRNCxx() {`
`51`	`49`	`if (require('os').platform() === 'win32') {`
	`50`	`+ const powershell = findPowerShell();`
`52`	`51`	`execSync(`
`53`	`52`	`"${powershell}" -NoProfile .\\Scripts\\Tfs\\Layout-MSRN-Headers.ps1 -GenerateLocalCxx`,
`54`	`53`	`{`