fix(dlx): set saveProd to true for getting pkgName from dependencies (#7540)

close #7424

---------

Co-authored-by: Zoltan Kochan <z@kochan.io>

.changeset/nasty-apricots-taste.md

@@ -0,0 +1,6 @@
+---
+"@pnpm/plugin-commands-script-runners": patch
+"pnpm": patch
+---
+
+Set saveProd to true for getting pkgName from dependencies [7424](https://github.com/pnpm/pnpm/issues/7424).

exec/plugin-commands-script-runners/src/dlx.ts

@@ -95,6 +95,10 @@ export async function handler (
     dir: prefix,
     lockfileDir: prefix,
     rootProjectManifestDir: prefix, // This property won't be used as rootProjectManifest will be undefined
+    saveProd: true, // dlx will be looking for the package in the "dependencies" field!
+    saveDev: false,
+    saveOptional: false,
+    savePeer: false,
   }, pkgs)
   const binName = opts.package
     ? command
@@ -119,7 +123,11 @@ export async function handler (
 
 async function getPkgName (pkgDir: string) {
   const manifest = await readPackageJsonFromDir(pkgDir)
-  return Object.keys(manifest.dependencies ?? {})[0]
+  const dependencyNames = Object.keys(manifest.dependencies ?? {})
+  if (dependencyNames.length === 0) {
+    throw new PnpmError('DLX_NO_DEP', 'dlx was unable to find the installed dependency in "dependencies"')
+  }
+  return dependencyNames[0]
 }
 
 async function getBinName (modulesDir: string, pkgName: string): Promise<string> {

pnpm/test/run.ts

@@ -1,7 +1,7 @@
 import { promises as fs, mkdirSync } from 'fs'
 import path from 'path'
 import PATH_NAME from 'path-name'
-import { prepare, preparePackages } from '@pnpm/prepare'
+import { prepare, prepareEmpty, preparePackages } from '@pnpm/prepare'
 import isWindows from 'is-windows'
 import { execPnpm, execPnpmSync } from './utils'
 
@@ -259,3 +259,14 @@ test('--reporter-hide-prefix should hide workspace prefix', async () => {
   expect(output).toContain('2')
   expect(output).not.toContain('script2: 2')
 })
+
+test('dlx should work with npm_config_save_dev env variable', async () => {
+  prepareEmpty()
+  const result = execPnpmSync(['dlx', '@foo/touch-file-one-bin@latest'], {
+    env: {
+      npm_config_save_dev: 'true',
+    },
+    stdio: 'inherit',
+  })
+  expect(result.status).toBe(0)
+})