Add --marketplace-url global CLI flag

[Miaku]

Summary

Add a global --marketplace-url <url> option that overrides the target marketplace endpoint for all commands (publish, unpublish, show, search, etc.). This enables publishing extensions to private or alternative marketplace instances without relying solely on the VSCE_MARKETPLACE_URL environment variable.

Motivation

Enterprise environments need the ability to publish VS extensions to private marketplace instances (e.g., for internal extension distribution, testing, or compliance gating). Currently the only way to override the endpoint is via the VSCE_MARKETPLACE_URL environment variable, which is less discoverable and harder to use in CI/CD pipelines where multiple targets may be needed.

A CLI flag makes the override explicit, composable, and documented.

Changes

• src/util.ts: Changed marketplaceUrl from const to let, added setMarketplaceUrl() export
• src/main.ts: Added --marketplace-url <url> as a global Commander option with a preAction hook

Precedence

--marketplace-url flag > VSCE_MARKETPLACE_URL env var > default (marketplace.visualstudio.com)

Usage

\\�ash
vsce publish --marketplace-url https://private.marketplace.example.com
vsce show my-extension --marketplace-url https://private.marketplace.example.com
\\

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