fix(libnpmpack): obey foregroundScripts

DEPENDENCIES.md

@@ -575,6 +575,7 @@ graph LR;
   libnpmpack-->npmcli-run-script["@npmcli/run-script"];
   libnpmpack-->npmcli-template-oss["@npmcli/template-oss"];
   libnpmpack-->pacote;
+  libnpmpack-->spawk;
   libnpmpack-->tap;
   libnpmpublish-->libnpmpack;
   libnpmpublish-->lodash.clonedeep;

workspaces/libnpmpack/lib/index.js

@@ -19,13 +19,15 @@ async function pack (spec = 'file:.', opts = {}) {
   // mode
   const banner = !opts.silent
 
+  const stdio = opts.foregroundScripts ? 'inherit' : 'pipe'
+
   if (spec.type === 'directory') {
     // prepack
     await runScript({
       ...opts,
       event: 'prepack',
       path: spec.fetchSpec,
-      stdio: 'inherit',
+      stdio,
       pkg: manifest,
       banner,
     })
@@ -52,7 +54,7 @@ async function pack (spec = 'file:.', opts = {}) {
       ...opts,
       event: 'postpack',
       path: spec.fetchSpec,
-      stdio: 'inherit',
+      stdio,
       pkg: manifest,
       banner,
       env: {

workspaces/libnpmpack/test/fixtures/tspawk.js

@@ -0,0 +1,15 @@
+'use strict'
+
+const spawk = require('spawk')
+
+module.exports = tspawk
+
+function tspawk (t) {
+  t.teardown(function () {
+    spawk.unload()
+  })
+  t.afterEach(function () {
+    spawk.done()
+  })
+  return spawk
+}

workspaces/libnpmpack/test/index.js

@@ -1,17 +1,27 @@
 'use strict'
 
 const t = require('tap')
+
+const tspawk = require('./fixtures/tspawk.js')
+const spawk = tspawk(t)
+
 const fs = require('fs')
 const path = require('path')
 const pack = require('../lib/index.js')
 const tnock = require('./fixtures/tnock.js')
+const { load: loadMockNpm } = require('../../../test/fixtures/mock-npm.js')
 
 const OPTS = {
   registry: 'https://mock.reg/',
 }
 
 const REG = OPTS.registry
 
+// TODO this ... smells.  npm "script-shell" config mentions defaults but those
+// are handled by run-script, not npm.  So for now we have to tie tests to some
+// pretty specific internals of runScript
+const makeSpawnArgs = require('@npmcli/run-script/lib/make-spawn-args.js')
+
 t.test('packs from local directory', async t => {
   const testDir = t.testdir({
     'package.json': JSON.stringify({
@@ -128,3 +138,40 @@ t.test('packs from registry spec', async t => {
   const tarball = await pack(spec, { ...OPTS })
   t.ok(tarball)
 })
+
+t.test('runs scripts in foreground when foregroundScripts === true', async t => {
+  const { npm } = await loadMockNpm(t, {})
+
+  const testDir = t.testdir({
+    'package.json': JSON.stringify({
+      name: 'my-cool-pkg',
+      version: '1.0.0',
+      scripts: {
+        prepack: 'touch prepack',
+        postpack: 'touch postpack',
+      },
+    }, null, 2),
+  })
+
+  const cwd = process.cwd()
+  process.chdir(testDir)
+
+  const [scriptShell, scriptArgs] = makeSpawnArgs({
+    event: 'prepack',
+    path: npm.prefix,
+    cmd: 'touch prepack',
+  })
+
+  const prepack = spawk.spawn(scriptShell, scriptArgs)
+
+  await pack('file:.', {
+    packDestination: testDir,
+    foregroundScripts: true,
+  })
+
+  t.ok(prepack.called)
+
+  t.teardown(async () => {
+    process.chdir(cwd)
+  })
+})