fix: pnpm exec should specify command (#8774)

.changeset/brown-weeks-roll.md

@@ -0,0 +1,5 @@
+---
+"@pnpm/plugin-commands-script-runners": patch
+---
+
+`pnpm exec` should print a meaningful error message when no command is provided [#8752](https://github.com/pnpm/pnpm/issues/8752).

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

@@ -174,6 +174,9 @@ export async function handler (
   if (params[0] === '--') {
     params.shift()
   }
+  if (!params[0]) {
+    throw new PnpmError('EXEC_MISSING_COMMAND', '\'pnpm exec\' requires a command to run')
+  }
   const limitRun = pLimit(opts.workspaceConcurrency ?? 4)
 
   if (opts.verifyDepsBeforeRun && !process.env[SKIP_ENV_KEY]) {
@@ -205,6 +208,10 @@ export async function handler (
     }
   }
 
+  if (!opts.selectedProjectsGraph) {
+    throw new PnpmError('RECURSIVE_EXEC_NO_PACKAGE', 'No package found in this workspace')
+  }
+
   if (opts.resumeFrom) {
     chunks = getResumedPackageChunks({
       resumeFrom: opts.resumeFrom,

exec/plugin-commands-script-runners/test/exec.ts

@@ -41,3 +41,14 @@ test('exec should set the NODE_OPTIONS env var', async () => {
     }),
   }))
 })
+
+test('exec should specify the command', async () => {
+  prepareEmpty()
+
+  await expect(exec.handler({
+    ...DEFAULT_OPTS,
+    dir: process.cwd(),
+    selectedProjectsGraph: {},
+  }, [])
+  ).rejects.toThrow("'pnpm exec' requires a command to run")
+})