Throw error when multiple versions specified

README.md

@@ -60,9 +60,7 @@ Location of `pnpm` and `pnpx` command.
 
 ## Usage example
 
-### Install only pnpm without `packageManager`
-
-This works when the repo either doesn't have a `package.json` or has a `package.json` but it doesn't specify `packageManager`.
+### Just install pnpm
 
 ```yaml
 on:
@@ -74,28 +72,11 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@v3
         with:
           version: 8
 ```
 
-###  Install only pnpm with `packageManager`
-
-Omit `version` input to use the version in the [`packageManager` field in the `package.json`](https://nodejs.org/api/corepack.html).
-
-```yaml
-on:
-  - push
-  - pull_request
-
-jobs:
-  install:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: pnpm/action-setup@v4
-```
-
 ### Install pnpm and a few npm packages
 
 ```yaml
@@ -110,7 +91,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@v3
         with:
           version: 8
           run_install: |
@@ -134,17 +115,29 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - uses: pnpm/action-setup@v4
+      - name: Install Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - uses: pnpm/action-setup@v3
         name: Install pnpm
         with:
           version: 8
           run_install: false
 
-      - name: Install Node.js
-        uses: actions/setup-node@v4
+      - name: Get pnpm store directory
+        shell: bash
+        run: |
+          echo "STORE_PATH=$(pnpm store path --silent)" >> $GITHUB_ENV
+
+      - uses: actions/cache@v4
+        name: Setup pnpm cache
         with:
-          node-version: 20
-          cache: 'pnpm'
+          path: ${{ env.STORE_PATH }}
+          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-pnpm-store-
 
       - name: Install dependencies
         run: pnpm install

action.yml

@@ -23,11 +23,6 @@ inputs:
     description: When set to true, @pnpm/exe, which is a Node.js bundled package, will be installed, enabling using pnpm without Node.js.
     required: false
     default: 'false'
-outputs:
-  dest:
-    description: Expanded path of inputs#dest
-  bin_dest:
-    description: Location of `pnpm` and `pnpx` command
 runs:
   using: node20
   main: dist/index.js

src/install-pnpm/run.ts

@@ -1,10 +1,8 @@
 import { addPath, exportVariable } from '@actions/core'
 import { spawn } from 'child_process'
-import { rm, writeFile, mkdir } from 'fs/promises'
-import { readFileSync } from 'fs'
+import { rm, writeFile, readFile, mkdir } from 'fs/promises'
 import path from 'path'
 import { execPath } from 'process'
-import util from 'util'
 import { Inputs } from '../inputs'
 
 export async function runSelfInstaller(inputs: Inputs): Promise<number> {
@@ -45,22 +43,14 @@ async function readTarget(opts: {
   const { version, packageJsonFile, standalone } = opts
   const { GITHUB_WORKSPACE } = process.env
 
-  let packageManager
+  let packageManager;
 
   if (GITHUB_WORKSPACE) {
-    try {
-      ({ packageManager } = JSON.parse(readFileSync(path.join(GITHUB_WORKSPACE, packageJsonFile), 'utf8')))
-    } catch (error: unknown) {
-      // Swallow error if package.json doesn't exist in root
-      if (!util.types.isNativeError(error) || !('code' in error) || error.code !== 'ENOENT') throw error
-    }
+    ({ packageManager } = JSON.parse(await readFile(path.join(GITHUB_WORKSPACE, packageJsonFile), 'utf8')))
   }
 
   if (version) {
-    if (
-      typeof packageManager === 'string' &&
-      packageManager.replace('pnpm@', '') !== version
-    ) {
+    if (typeof packageManager === 'string') {
       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"
@@ -72,7 +62,7 @@ Remove one of these versions to avoid version mismatch errors like ERR_PNPM_BAD_
 
   if (!GITHUB_WORKSPACE) {
     throw new Error(`No workspace is found.
-If you've intended to let pnpm/action-setup read preferred pnpm version from the "packageManager" field in the package.json file,
+If you're intended to let pnpm/action-setup read preferred pnpm version from the "packageManager" field in the package.json file,
 please run the actions/checkout before pnpm/action-setup.
 Otherwise, please specify the pnpm version in the action configuration.`)
   }
@@ -88,7 +78,7 @@ 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@')
   }