Re-export barrels unresolved after #130: default re-exports (export { default as X } from './x.svelte'), bare './' index imports, and package-subpath barrels - callers/callees/impact miss the edge (false 0 callers)

[nakisen]

Builds on #130 (re-export chain following). On v0.9.8 several common barrel forms are still not resolved, so the symbol-level edge between a consumer and the re-exported definition is never created. This affects both directions:

• codegraph_callees leaves the barrel as a raw, unresolved import node (no edge to the real symbol).
• codegraph_callers / codegraph_impact of the underlying definition return 0 — a false "orphan". This is risky because 0 callers is the canonical dead-code signal, so it can lead to deleting live code.

Still-missed forms (after #130)

#130 covered export { a, b as c } from '...', export * from '...', and export * as ns from '...'. The following are still missed:

1. Default re-export — export { default as Foo } from './Foo.svelte'. Re-exporting the default binding (ubiquitous for Svelte / React component barrels). A .svelte file's component (its default export) is not matched as default.
2. Bare directory import — import { Foo } from './' (or from '.'), which should resolve to ./index.ts. The specifier is not mapped to the directory's index.ts.
3. Workspace package-subpath barrels — import { X } from '@scope/pkg/sub' → packages/pkg/.../sub/index.ts → x.svelte.

Minimal repro

// lib/foo/Foo.svelte                 — a Svelte component (default export)
// lib/foo/index.ts
export { default as Foo } from './Foo.svelte';
// lib/Bar.svelte
import { Foo } from './foo';          // uses <Foo /> in markup

codegraph callees Bar
  -> lists "./foo (import)" as a raw unresolved node; no edge to Foo / Foo.svelte

codegraph callers Foo
  -> No callers found            (expected: Bar)

• Querying the alias name (callers Foo, where Foo is the re-exported name) returns at most the import line of some consumers and misses others; it is never unified with the underlying component node.
• The package-subpath form behaves the same: import { X } from '@scope/pkg/sub' → callees shows @scope/pkg/sub (import) raw; callers X = 0 despite many importers.

Expected

Resolve these re-export forms so the consumer↔definition edge exists in both callees and callers / impact:

• export { default as X } from './X.svelte' (map a .svelte default export to its component node),
• bare './' / '.' → index.ts,
• workspace package-subpath barrels (@scope/pkg/sub → its index.ts).

Why it matters

Barrels (index.ts aggregators) are universal in TS / Svelte / React component libraries. A false 0 callers defeats the primary use case of callers / impact (safe refactor / dead-code detection). Observed in a Svelte 5 + SvelteKit 2 bun-workspace monorepo (~600 files indexed): multiple live components reported 0 callers and minimal impact purely because they are consumed through these barrel forms — only an external grep revealed they were live. The forward callees check confirms the barrel import is left unresolved, so this is an edge-creation gap, not only a query-side issue.

Environment

• codegraph v0.9.8 (node:sqlite backend)
• Windows 11
• TypeScript + Svelte (SvelteKit 2 / Svelte 5), bun workspace monorepo