[CLI]: Negative positional arguments are parsed as flags, breaking mousewheel scroll-up #42321

Version

@playwright/cli 0.1.18 (playwright-core 1.63.0-alpha-2026-08-05); also reproduces on 0.1.14

Steps to reproduce

Serve any scrollable page, then:

playwright-cli mousewheel 0 300     # works, page scrolls down
playwright-cli mousewheel 0 -100    # fails

Actual

Unknown options: --0, --1

Exit code 1, and the page receives no wheel event at all (verified with a
capture-phase wheel listener counting by sign: up stays 0, scrollY unchanged).

Since mousewheel <dx> <dy> takes both deltas as positional arguments, scrolling
up is unreachable through this command.

Expected

mousewheel 0 -100 scrolls up.

Root cause

packages/playwright-core/src/tools/cli-client/minimist.ts: -100 matches the
short-flag branch /^-[^-]+/, which has no escape for numeric arguments, so the
value never reaches _:

minimist(['mousewheel', '0', '-100'])
// => { _: ['mousewheel', '0'], '0': true, '1': true }

The vendored parser inherits this from minimist, but the CLI pairs it with commands
whose positional arguments are legitimately signed, so any negative positional is
unreachable — not just wheel deltas.

Workaround

playwright-cli mousewheel 0 -- -100   # => up=1, scrollY 300 -> 200

Suggested fix

Treat an argument matching /^-\d/ (or the numeric pattern already used inside that
branch) as positional, the way commander and yargs do. Related positional-parsing
fixes on the same parser: #39148, #39215.

Also worth noting: the bundled skills/playwright-cli/SKILL.md only ever shows
mousewheel 0 100, so an agent following it hits this the first time it needs to
scroll up.