Match versions

src/install-pnpm/run.ts

@@ -43,14 +43,22 @@ async function readTarget(opts: {
   const { version, packageJsonFile, standalone } = opts
   const { GITHUB_WORKSPACE } = process.env
 
-  let packageManager;
+  let packageManager
 
   if (GITHUB_WORKSPACE) {
-    ({ packageManager } = JSON.parse(await readFile(path.join(GITHUB_WORKSPACE, packageJsonFile), 'utf8')))
+    try {
+      ({ packageManager } = JSON.parse(await readFile(path.join(GITHUB_WORKSPACE, packageJsonFile), 'utf8')))
+    } catch (error) {
+      // Swallow error if package.json doesn't exist in root
+      if (error.code !== 'ENOENT') throw error
+    }
   }
 
   if (version) {
-    if (typeof packageManager === 'string') {
+    if (
+      typeof packageManager === 'string' &&
+      packageManager.replace('pnpm@', '') !== version
+    ) {
       throw new Error(`Multiple versions of pnpm specified:
   - version ${version} in the GitHub Action config with the key "version"
   - version ${packageManager} in the package.json with the key "packageManager"
@@ -78,7 +86,7 @@ Please specify it by one of the following ways:
     throw new Error('Invalid packageManager field in package.json')
   }
 
-  if (standalone){
+  if (standalone) {
     return packageManager.replace('pnpm@', '@pnpm/exe@')
   }