docs: bump action-setup version in README

* Throw error when multiple versions specified

* fix: fmt

* fix: fmt

* Swallow error on ENOENT

* Match versions

* refactor: install pnpm

---------

Co-authored-by: Khải <hvksmr1996@gmail.com>
Co-authored-by: Zoltan Kochan <z@kochan.io>

README.md

@@ -72,7 +72,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: pnpm/action-setup@v3
+      - uses: pnpm/action-setup@v4
         with:
           version: 8
 ```
@@ -91,7 +91,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: pnpm/action-setup@v3
+      - uses: pnpm/action-setup@v4
         with:
           version: 8
           run_install: |
@@ -120,7 +120,7 @@ jobs:
         with:
           node-version: 20
 
-      - uses: pnpm/action-setup@v3
+      - uses: pnpm/action-setup@v4
         name: Install pnpm
         with:
           version: 8

src/install-pnpm/run.ts

@@ -1,8 +1,10 @@
 import { addPath, exportVariable } from '@actions/core'
 import { spawn } from 'child_process'
-import { rm, writeFile, readFile, mkdir } from 'fs/promises'
+import { rm, writeFile, mkdir } from 'fs/promises'
+import { readFileSync } from 'fs'
 import path from 'path'
 import { execPath } from 'process'
+import util from 'util'
 import { Inputs } from '../inputs'
 
 export async function runSelfInstaller(inputs: Inputs): Promise<number> {
@@ -47,10 +49,10 @@ async function readTarget(opts: {
 
   if (GITHUB_WORKSPACE) {
     try {
-      ({ packageManager } = JSON.parse(await readFile(path.join(GITHUB_WORKSPACE, packageJsonFile), 'utf8')))
-    } catch (error) {
+      ({ packageManager } = JSON.parse(readFileSync(path.join(GITHUB_WORKSPACE, packageJsonFile), 'utf8')))
+    } catch (error: unknown) {
       // Swallow error if package.json doesn't exist in root
-      if (error.code !== 'ENOENT') throw error
+      if (!util.types.isNativeError(error) || !('code' in error) || error.code !== 'ENOENT') throw error
     }
   }