feat: add support for package.json5 format

copy .npmrc from GitHub workspace if it exists so that PNPM respects custom
registry configurations when self-installing

README.md

@@ -40,11 +40,11 @@ If `run_install` is a YAML string representation of either an object or an array
 
 #### `run_install.args`
 
-**Optional** (_type:_ `string[]`) Additional arguments after `pnpm [recursive] install`, e.g. `[--frozen-lockfile, --strict-peer-dependencies]`.
+**Optional** (_type:_ `string[]`) Additional arguments after `pnpm [recursive] install`, e.g. `[--ignore-scripts, --strict-peer-dependencies]`.
 
 ### `package_json_file`
 
-**Optional** (_type:_ `string`, _default:_ `package.json`) File path to the `package.json` to read "packageManager" configuration.
+**Optional** (_type:_ `string`, _default:_ `package.json`) File path to the `package.json`/[`package.yaml`](https://github.com/pnpm/pnpm/pull/1799)/`package.json5` to read "packageManager" configuration.
 
 ### `standalone`
 
@@ -117,9 +117,9 @@ jobs:
       - uses: pnpm/action-setup@v4
         with:
           version: 10
-          run_install: |
+          run_install:
             - recursive: true
-              args: [--frozen-lockfile, --strict-peer-dependencies]
+              args: [--strict-peer-dependencies]
             - args: [--global, gulp, prettier, typescript]
 ```
 

package.json

@@ -12,6 +12,7 @@
     "@types/node": "^20.11.5",
     "@types/node-fetch": "^2.6.11",
     "expand-tilde": "^2.0.2",
+    "json5": "^2.2.3",
     "yaml": "^2.3.4",
     "zod": "^3.22.4"
   },

pnpm-lock.yaml

@@ -23,6 +23,9 @@ importers:
       expand-tilde:
         specifier: ^2.0.2
         version: 2.0.2
+      json5:
+        specifier: ^2.2.3
+        version: 2.2.3
       yaml:
         specifier: ^2.3.4
         version: 2.7.0
@@ -90,6 +93,11 @@ packages:
     resolution: {integrity: sha512-eSmmWE5bZTK2Nou4g0AI3zZ9rswp7GRKoKXS1BLUkvPviOqs4YTN1djQIqrXy9k5gEtdLPy86JjRwsNM9tnDcA==}
     engines: {node: '>=0.10.0'}
 
+  json5@2.2.3:
+    resolution: {integrity: sha512-XmOWe7eyHYH14cLdVPoyg+GOH3rYX++KpzrylJwSW98t3Nk+U8XOl8FWKOgwtzdb8lXGf6zYwDUzeHMWfxasyg==}
+    engines: {node: '>=6'}
+    hasBin: true
+
   mime-db@1.52.0:
     resolution: {integrity: sha512-sPU4uV7dYlvtWJxwwxHD0PuihVNiE7TyAbQ5SWxDCB9mUYvOgroQOwYQQOKPJ8CIbE+1ETVlOoK1UC2nU3gYvg==}
     engines: {node: '>= 0.6'}
@@ -179,6 +187,8 @@ snapshots:
     dependencies:
       parse-passwd: 1.0.0
 
+  json5@2.2.3: {}
+
   mime-db@1.52.0: {}
 
   mime-types@2.1.35:

src/install-pnpm/run.ts

@@ -1,15 +1,17 @@
 import { addPath, exportVariable } from '@actions/core'
 import { spawn } from 'child_process'
-import { rm, writeFile, mkdir } from 'fs/promises'
+import { rm, writeFile, mkdir, copyFile } from 'fs/promises'
 import { readFileSync } from 'fs'
 import path from 'path'
 import { execPath } from 'process'
 import util from 'util'
 import { Inputs } from '../inputs'
 import YAML from 'yaml'
+import JSON5 from 'json5'
 
 export async function runSelfInstaller(inputs: Inputs): Promise<number> {
   const { version, dest, packageJsonFile, standalone } = inputs
+  const { GITHUB_WORKSPACE } = process.env
 
   // prepare self install
   await rm(dest, { recursive: true, force: true })
@@ -19,6 +21,16 @@ export async function runSelfInstaller(inputs: Inputs): Promise<number> {
   // we have ensured the dest directory exists, we can write the file directly
   await writeFile(pkgJson, JSON.stringify({ private: true }))
 
+  // copy .npmrc if it exists to install from custom registry
+  if (GITHUB_WORKSPACE) {
+    try {
+      await copyFile(path.join(GITHUB_WORKSPACE, '.npmrc'), path.join(dest, '.npmrc'))
+    } catch (error) {
+      // Swallow error if .npmrc doesn't exist
+      if (!util.types.isNativeError(error) || !('code' in error) || error.code !== 'ENOENT') throw error
+    }
+  }
+
   // prepare target pnpm
   const target = await readTarget({ version, packageJsonFile, standalone })
   const cp = spawn(execPath, [path.join(__dirname, 'pnpm.cjs'), 'install', target, '--no-lockfile'], {
@@ -53,7 +65,7 @@ async function readTarget(opts: {
       const content = readFileSync(path.join(GITHUB_WORKSPACE, packageJsonFile), 'utf8');
       ({ packageManager } = packageJsonFile.endsWith(".yaml")
         ? YAML.parse(content, { merge: true })
-        : JSON.parse(content)
+        : JSON5.parse(content)
       )
     } catch (error: unknown) {
       // Swallow error if package.json doesn't exist in root
@@ -64,6 +76,7 @@ async function readTarget(opts: {
   if (version) {
     if (
       typeof packageManager === 'string' &&
+      packageManager.startsWith('pnpm@') &&
       packageManager.replace('pnpm@', '') !== version
     ) {
       throw new Error(`Multiple versions of pnpm specified: