Print process id when running

packages/scripts/src/Subprocess.test.ts

@@ -32,7 +32,8 @@ describe('Subprocess', () => {
     // })
 
     it('resolves on successful invocation', async () => {
-      await new Subprocess('ls', [], {}, StdioOptions.IGNORE).run()
+      await new Subprocess(
+        process.argv[0], ['-e', '1 + 1'], {}, StdioOptions.IGNORE).run()
     })
 
   })

packages/scripts/src/Subprocess.ts

@@ -8,16 +8,22 @@ export enum StdioOptions {
 
 export class Subprocess {
 
+  static count = 0
+  private readonly i: number
+
   constructor(
     public readonly command: string,
     public readonly args: readonly string[],
     public readonly environment: Record<string, string | undefined>,
     public readonly stdio: StdioOptions = StdioOptions.PIPE,
-  ) {}
+  ) {
+    this.i = ++Subprocess.count
+  }
 
   async run(cwd?: string) {
+    const {i} = this
     return new Promise((resolve, reject) => {
-      process.stderr.write(`> ${this.command} ${this.args.join(' ')}\n`)
+      process.stderr.write(`[${i}]: ${this.command} ${this.args.join(' ')}\n`)
       const subprocess = spawn(this.command, this.args, {
         shell: false,
         stdio: this.stdio,
@@ -26,8 +32,14 @@ export class Subprocess {
       })
 
       if (this.stdio === StdioOptions.PIPE) {
-        subprocess.stdout!.on('data', data => process.stdout.write(data))
+        subprocess.stdout!.on('data', data => {
-        subprocess.stderr!.on('data', data => process.stderr.write(data))
+          process.stdout.write(`${i}> `)
+          process.stdout.write(data)
+        })
+        subprocess.stderr!.on('data', data => {
+          process.stdout.write(`${i}> `)
+          process.stderr.write(data)
+        })
       }
 
       subprocess.on('close', code => {