Three flat O(1) indexes + pure build functions over per-file artifacts.
Contract-only; no runtime behavior change yet — consumers (#917 Registry
lookups, #915 SCC finalize, #919 ScopeExtractor) wire in later.
Each index follows the same shape:
- build function: flat input list → frozen immutable index
- public interface: readonly Map + get/has/size accessors
- first-write-wins on id/filePath collisions (upstream bug signal)
- pure, side-effect-free, safe to call repeatedly
DefIndex — the global "what is this id?" lookup
gitnexus-shared/src/scope-resolution/def-index.ts
buildDefIndex(defs: readonly SymbolDefinition[]): DefIndex
byId: ReadonlyMap<DefId, SymbolDefinition>
Consumed by Registry.lookup (#917) to materialize DefId[] hits back to
full SymbolDefinition records.
ModuleScopeIndex — `filePath → moduleScopeId` for cross-file hops
gitnexus-shared/src/scope-resolution/module-scope-index.ts
buildModuleScopeIndex(entries): ModuleScopeIndex
byFilePath: ReadonlyMap<string, ScopeId>
Consumed by the SCC finalize link pass (#915) to resolve
ImportEdge.targetFile to a concrete module scope in constant time.
QualifiedNameIndex — cross-kind qualified-name fast path
gitnexus-shared/src/scope-resolution/qualified-name-index.ts
buildQualifiedNameIndex(defs: readonly SymbolDefinition[]): QualifiedNameIndex
byQualifiedName: ReadonlyMap<string, readonly DefId[]>
Returns DefId[] (not a single DefId) because partial classes, method
overloads, and cross-kind collisions can legitimately share a
qualifiedName. Callers filter by acceptedKinds at the lookup site.
Consumed by Registry.lookup qualified fast path + resolveTypeRef
dotted fallback (#916, #917).
Barrel re-exports added to gitnexus-shared/src/index.ts so consumers
import from 'gitnexus-shared' rather than deep paths.
Tests (gitnexus/test/unit/scope-resolution/, 23 total):
def-index.test.ts (6):
empty, single def, multiple distinct, first-write-wins collision,
missing id returns undefined, byId direct iteration
module-scope-index.test.ts (6):
empty, single entry, multiple files, first-write-wins on duplicate
filePath, missing returns undefined, byFilePath direct iteration
qualified-name-index.test.ts (11):
empty, single qnamed def, partial classes accumulate, input-order
preservation, qname separation, skip undefined/empty qname, pair
dedup, cross-kind indexing, frozen-empty-array on miss, direct
iteration
Verification:
- gitnexus-shared + gitnexus build clean (tsc + scripts/build.js)
- test/unit/scope-resolution: 23/23 pass
- model + shadow + scope-resolution combined: 129/129 pass
- No runtime consumer wiring yet — indexes are standalone library
functions that #915, #917, #919 will import when ready
Depends on #910 (SymbolDefinition, DefId, ScopeId types — already on main).
Unblocks #915 (finalize algorithm), #917 (Registry.lookup), #919
(ScopeExtractor materialization).
