pnpm run --stream does not reports with dir prefix if there is only one package filtered

[kenrick95]

pnpm version: 6.32.11

Note: also happened in v7.0.1

Code to reproduce the issue:

See https://github.com/kenrick95/pnpm-stream-issue-repro

Summary:

When there is only 1 package passed at --filter, even when we specify --stream, the result is not reported with dir prefix

pnpm --stream --filter alfa lint

Expected behavior:

Scope: 1 of 3 workspace projects
packages/alfa lint$ echo 'ok'
packages/alfa lint: ok
packages/alfa lint: Done

Actual behavior:

> alfa@1.0.0 lint /path/to/repo/packages/alfa
> echo 'ok'

ok

Additional information:

• node -v prints: v14.19.0
• Windows, macOS, or Linux?: macOS 12.3.1

As comparison, in Lerna, running with --stream will always report with prefix.

lerna run lint --stream --scope alfa

lerna notice cli v4.0.0
lerna notice filter including "alfa"
lerna info filter [ 'alfa' ]
lerna info Executing command in 1 package: "npm run lint"
alfa: > alfa@1.0.0 lint
alfa: > echo 'ok'
alfa: ok
lerna success run Ran npm script 'lint' in 1 package in 0.3s:
lerna success - alfa