fix: use binPaths

This will allow for a locally installed package to differ from the one
requested on the command line, the one requested will now actually run.

workspaces/libnpmexec/lib/index.js

@@ -19,9 +19,9 @@ const noTTY = require('./no-tty.js')
 const runScript = require('./run-script.js')
 const isWindows = require('./is-windows.js')
 
-const { delimiter, dirname, resolve } = require('path')
+const { dirname, resolve } = require('path')
 
-const pathArr = process.env.PATH.split(delimiter)
+const binPaths = []
 
 // when checking the local tree we look up manifests, cache those results by
 // spec.raw so we don't have to fetch again when we check npxCache
@@ -96,7 +96,7 @@ const exec = async (opts) => {
     locationMsg,
     output,
     path,
-    pathArr,
+    binPaths,
     runPath,
     scriptShell,
   })
@@ -113,10 +113,10 @@ const exec = async (opts) => {
     const dir = dirname(dirname(localBin))
     const localBinPath = await localFileExists(dir, args[0], '/')
     if (localBinPath) {
-      // @npmcli/run-script adds local bin to $PATH itself
+      binPaths.push(localBinPath)
       return await run()
     } else if (await fileExists(`${globalBin}/${args[0]}`)) {
-      pathArr.unshift(globalBin)
+      binPaths.push(globalBin)
       return await run()
     }
 
@@ -213,7 +213,7 @@ const exec = async (opts) => {
         add,
       })
     }
-    pathArr.unshift(resolve(installDir, 'node_modules/.bin'))
+    binPaths.push(resolve(installDir, 'node_modules/.bin'))
   }
 
   return await run()

workspaces/libnpmexec/lib/run-script.js

@@ -1,5 +1,3 @@
-const { delimiter } = require('path')
-
 const chalk = require('chalk')
 const ciDetect = require('@npmcli/ci-detect')
 const runScript = require('@npmcli/run-script')
@@ -22,7 +20,7 @@ const run = async ({
   locationMsg,
   output = () => {},
   path,
-  pathArr,
+  binPaths,
   runPath,
   scriptShell,
 }) => {
@@ -71,11 +69,9 @@ const run = async ({
       // we always run in cwd, not --prefix
       path: runPath,
       stdioString: true,
+      binPaths,
       event: 'npx',
       args,
-      env: {
-        PATH: pathArr.join(delimiter),
-      },
       stdio: 'inherit',
     })
   } finally {

workspaces/libnpmexec/test/run-script.js

@@ -5,7 +5,6 @@ const baseOpts = {
   call: '',
   color: false,
   path: '',
-  pathArr: [''],
   runPath: '',
   shell: process.platform === 'win32'
     ? process.env.ComSpec || 'cmd'