---
phase: 21-typescript-method-sub-chunking
verified: 2026-02-24T17:30:00Z
status: passed
score: 6/6 must-haves verified
re_verification: false
---

# Phase 21: TypeScript Method Sub-Chunking Verification Report

**Phase Goal:** TypeScript classes are indexed at method granularity — each method becomes a separately searchable chunk named ClassName.method_name
**Verified:** 2026-02-24T17:30:00Z
**Status:** passed
**Re-verification:** No — initial verification

## Goal Achievement

### Observable Truths

| #  | Truth                                                                                                                                      | Status     | Evidence                                                                                              |
|----|--------------------------------------------------------------------------------------------------------------------------------------------|------------|-------------------------------------------------------------------------------------------------------|
| 1  | chunk_typescript() produces a header chunk (ClassName) plus one ClassName.method_name chunk per method_definition node in any class_declaration or abstract_class_declaration | VERIFIED | Lines 278-283 of ts_chunker.py: early branch calls _chunk_ts_class() for class nodes; 13/13 TestChunkTypeScriptMethodChunks tests pass |
| 2  | The constructor becomes ClassName.constructor                                                                                              | VERIFIED | test_constructor_becomes_dot_constructor PASSED; _chunk_ts_class() uses child_by_field_name("name") which returns "constructor" for constructor nodes |
| 3  | Abstract method declarations produce per-method chunks just like concrete methods                                                          | VERIFIED | _METHOD_NODE_TYPES frozenset includes "abstract_method_signature"; test_abstract_method_chunked PASSED |
| 4  | Top-level functions, interfaces, enums, and type aliases are unaffected — their chunks are unchanged                                       | VERIFIED | Early class branch uses `continue`; all other _TARGET_TYPES fall through to existing single-chunk path; test_top_level_function_unaffected PASSED |
| 5  | The monolithic class chunk is fully replaced by header + per-method chunks                                                                 | VERIFIED | test_monolithic_replaced_by_header_plus_methods PASSED; class with 2 methods yields >= 3 chunks named MyClass* |
| 6  | Re-chunking the same TypeScript file produces identical results deterministically                                                           | VERIFIED | test_deterministic_output PASSED; no mutable state or random elements in _chunk_ts_class() |

**Score:** 6/6 truths verified

### Required Artifacts

| Artifact                                              | Expected                                                    | Status     | Details                                                                                                  |
|-------------------------------------------------------|-------------------------------------------------------------|------------|----------------------------------------------------------------------------------------------------------|
| `src/corpus_analyzer/ingest/ts_chunker.py`            | _chunk_ts_class() helper + integration into chunk_typescript() main loop; contains "ClassName.method_name" pattern | VERIFIED   | 326 lines; _chunk_ts_class() defined at line 88; called at line 281; f"{class_name}.{method_name}" at line 177 |
| `tests/ingest/test_chunker.py`                        | TestChunkTypeScriptMethodChunks test class covering all SUB-03 cases | VERIFIED   | Class defined at line 932; 13 test methods; all pass GREEN                                               |

### Key Link Verification

| From                                    | To                                             | Via                                               | Status   | Details                                                                         |
|-----------------------------------------|------------------------------------------------|---------------------------------------------------|----------|---------------------------------------------------------------------------------|
| chunk_typescript() class_declaration branch | _chunk_ts_class()                          | call instead of single-chunk emit for class nodes | VERIFIED | Lines 279-283: `if node.type in ("class_declaration", "abstract_class_declaration"): ... sub_chunks = _chunk_ts_class(...); chunks.extend(sub_chunks); continue` |
| _chunk_ts_class()                       | method_definition nodes in class_body          | iterating node children where child.type in _METHOD_NODE_TYPES | VERIFIED | Line 129: `method_nodes = [child for child in class_body.children if child.type in _METHOD_NODE_TYPES]`; _METHOD_NODE_TYPES = frozenset({"method_definition", "abstract_method_signature"}) |
| chunk_name                              | ClassName.method_name                          | f"{class_name}.{method_name}" construction        | VERIFIED | Line 177: `chunk_name = f"{class_name}.{method_name}"` — exact pattern confirmed |

### Requirements Coverage

| Requirement | Source Plan | Description                                                                                                                     | Status    | Evidence                                                                                                          |
|-------------|-------------|---------------------------------------------------------------------------------------------------------------------------------|-----------|-------------------------------------------------------------------------------------------------------------------|
| SUB-03      | 21-01-PLAN  | TypeScript AST chunker produces per-method chunks (ClassName.method_name) for method_definition nodes in class bodies; constructor becomes ClassName.constructor | SATISFIED | _chunk_ts_class() implemented; _METHOD_NODE_TYPES covers method_definition + abstract_method_signature; 13 tests pass; 382 total suite passes |

No orphaned requirements: REQUIREMENTS.md line 82 maps SUB-03 to Phase 21, status "Complete". No additional phase-21-mapped requirements were found.

### Anti-Patterns Found

| File                                               | Line | Pattern      | Severity | Impact                              |
|----------------------------------------------------|------|--------------|----------|-------------------------------------|
| `src/corpus_analyzer/ingest/ts_chunker.py`         | 224  | `return []`  | Info     | Legitimate empty-source guard — file has no content. Not a stub. |

No blockers or warnings found. The single `return []` is correct behaviour for a blank source file.

### Human Verification Required

None. All observable behaviours are verifiable programmatically via the 13 TDD tests.

### Gaps Summary

No gaps. All six must-have truths are verified, both artifacts are substantive and wired, all three key links are confirmed in the actual source, and SUB-03 is satisfied.

---

## Supporting Evidence

**Test run (13/13 TestChunkTypeScriptMethodChunks):**

```
tests/ingest/test_chunker.py::TestChunkTypeScriptMethodChunks::test_class_methods_produce_dot_name_chunks PASSED
tests/ingest/test_chunker.py::TestChunkTypeScriptMethodChunks::test_constructor_becomes_dot_constructor PASSED
tests/ingest/test_chunker.py::TestChunkTypeScriptMethodChunks::test_abstract_method_chunked PASSED
tests/ingest/test_chunker.py::TestChunkTypeScriptMethodChunks::test_abstract_class_concrete_method_chunked PASSED
tests/ingest/test_chunker.py::TestChunkTypeScriptMethodChunks::test_header_chunk_always_emitted PASSED
tests/ingest/test_chunker.py::TestChunkTypeScriptMethodChunks::test_monolithic_replaced_by_header_plus_methods PASSED
tests/ingest/test_chunker.py::TestChunkTypeScriptMethodChunks::test_method_chunk_text_contains_method_name PASSED
tests/ingest/test_chunker.py::TestChunkTypeScriptMethodChunks::test_method_chunk_line_range PASSED
tests/ingest/test_chunker.py::TestChunkTypeScriptMethodChunks::test_no_methods_no_method_chunks PASSED
tests/ingest/test_chunker.py::TestChunkTypeScriptMethodChunks::test_multi_class_file_all_classes_sub_chunked PASSED
tests/ingest/test_chunker.py::TestChunkTypeScriptMethodChunks::test_top_level_function_unaffected PASSED
tests/ingest/test_chunker.py::TestChunkTypeScriptMethodChunks::test_exported_class_sub_chunked PASSED
tests/ingest/test_chunker.py::TestChunkTypeScriptMethodChunks::test_deterministic_output PASSED
13 passed in 0.02s
```

**Full suite:** 382 passed (369 pre-phase + 13 new SUB-03 tests), 0 failures.

**Static analysis:** ruff clean, mypy clean on `ts_chunker.py`.

**Commits verified:**
- `ddeaa9e` test(21-01): add failing SUB-03 TypeScript method chunk tests
- `4385799` feat(21-01): add _chunk_ts_class() with per-method chunks for SUB-03
- `0eab6ea` refactor(21-01): ruff + mypy clean after SUB-03 implementation
- `9556649` docs(21-01): complete SUB-03 TypeScript method sub-chunking plan

---

_Verified: 2026-02-24T17:30:00Z_
_Verifier: Claude (gsd-verifier)_
