Source-map original-source parsing reported `import type X = require("m")`
as a require dependency, although TypeScript erases the declaration. The
fetcher re-derived import-equals targets instead of using the existing
value-only rule. That rule now lives with the other type-only module
declaration predicates in javascriptModuleDeclaration, and the fetcher,
static analysis, and semantic analysis all use it.
Fixes#3932
Co-authored-by: Claude Opus 5.5 <[email protected]>
