feat: try support packageManager

README.md

@@ -6,7 +6,11 @@ Install pnpm package manager.
 
 ### `version`
 
-**Required** Version of pnpm to install. It supports npm versioning scheme, it could be an exact version (such as `6.24.1`), or a version range (such as `6`, `6.x.x`, `6.24.x`, `^6.24.1`, `*`, etc.), or `latest`.
+Version of pnpm to install.
+
+**Optional** when there is a [`packageManager` field in the `package.json`](https://nodejs.org/api/corepack.html).
+
+otherwise, this field is **required** It supports npm versioning scheme, it could be an exact version (such as `6.24.1`), or a version range (such as `6`, `6.x.x`, `6.24.x`, `^6.24.1`, `*`, etc.), or `latest`.
 
 ### `dest`
 

package.json

@@ -8,21 +8,21 @@
   },
   "dependencies": {
     "@actions/core": "^1.6.0",
-    "@pnpm/fetch": "^4.2.4",
+    "@pnpm/fetch": "^4.2.5",
     "@pnpm/logger": "^4.0.0",
     "@types/expand-tilde": "^2.0.0",
     "@types/fs-extra": "^9.0.13",
     "@types/js-yaml": "^4.0.5",
     "@types/node": "^14.18.10",
-    "@types/node-fetch": "^2.5.12",
+    "@types/node-fetch": "^2.6.1",
     "ajv": "^6.12.6",
     "expand-tilde": "^2.0.2",
-    "fs-extra": "^9.1.0",
+    "fs-extra": "^10.0.0",
     "js-yaml": "^4.1.0"
   },
   "devDependencies": {
     "@ts-schema-autogen/cli": "^0.1.2",
-    "@vercel/ncc": "^0.27.0",
+    "@vercel/ncc": "^0.33.3",
     "typescript": "^4.5.5"
   }
 }

src/inputs/index.ts

@@ -3,7 +3,7 @@ import expandTilde from 'expand-tilde'
 import { RunInstall, parseRunInstall } from './run-install'
 
 export interface Inputs {
-  readonly version: string
+  readonly version?: string
   readonly dest: string
   readonly runInstall: RunInstall[]
 }
@@ -15,7 +15,7 @@ const options: InputOptions = {
 const parseInputPath = (name: string) => expandTilde(getInput(name, options))
 
 export const getInputs = (): Inputs => ({
-  version: getInput('version', options),
+  version: getInput('version'),
   dest: parseInputPath('dest'),
   runInstall: parseRunInstall('run_install'),
 })

src/install-pnpm/run.ts

@@ -2,14 +2,14 @@ import { addPath, exportVariable } from '@actions/core'
 import { spawn } from 'child_process'
 import { execPath } from 'process'
 import path from 'path'
-import { remove, ensureFile, writeFile } from 'fs-extra'
+import { remove, ensureFile, writeFile, readFile } from 'fs-extra'
 import fetch from '@pnpm/fetch'
 import { Inputs } from '../inputs'
 
 export async function runSelfInstaller(inputs: Inputs): Promise<number> {
   const { version, dest } = inputs
-  const target = version ? `pnpm@${version}` : 'pnpm'
   const pkgJson = path.join(dest, 'package.json')
+  const target = await readTarget(pkgJson, version)
 
   await remove(dest)
   await ensureFile(pkgJson)
@@ -36,4 +36,21 @@ export async function runSelfInstaller(inputs: Inputs): Promise<number> {
   return exitCode
 }
 
+async function readTarget(packageJsonPath: string, version?: string | undefined) {
+  if (version) return `pnpm@${version}`
+
+  const { packageManager } = JSON.parse(await readFile(packageJsonPath, 'utf8'))
+  if (typeof packageManager !== 'string') {
+    throw new Error(`No pnpm version is specified.
+Please specify it by one of the following way:
+  - in the GitHub Action config with the key "version"
+  - in the package.json with the key "packageManager" (See https://nodejs.org/api/corepack.html)`)
+  }
+
+  if (!packageManager.startsWith('pnpm@')) {
+    throw new Error('Invalid packageManager field in package.json')
+  }
+  return packageManager
+}
+
 export default runSelfInstaller