Function checkInstallable

checkInstallable(
    fetcher: (url: string) => Promise<Response>,
    name: string,
    installed: Record<string, string>,
    platform?: PlatformVersions,
): Promise<InstallVerdict>
The whole check: one fetch, then arithmetic.
Parameters
- fetcher: (url: string) => Promise<Response>
  injected so a test drives it without network, and so a caller can supply a cache-wrapped fetch. Packagist's p2 payloads are immutable per version, which is what makes one cached fetch the right shape.
- name: string
- installed: Record<string, string>
- platform: PlatformVersions = DEFAULT_PLATFORM
Returns Promise<InstallVerdict>
- Defined in src/ops/packagist.ts:227