Replaces the focused search quality improvement loop with a complete language verification system. The new guide provides a systematic battery of tests (explore, search, call chains, impact analysis, edge extraction, node completeness, and real-world LLM prompts) to verify CodeGraph fully supports a programming language before marking it as production-ready.
539 lines
20 KiB
Markdown
539 lines
20 KiB
Markdown
# CodeGraph Language Verification Guide
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You are verifying that CodeGraph fully supports a specific programming language. The user will give you a path to a real-world, popular open-source codebase cloned locally. Your job is to run a battery of realistic prompts against it using CodeGraph's API and verify the results are good enough to say that language is **covered and supported**.
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A language is NOT verified until an LLM can reliably use CodeGraph's MCP tools to navigate that codebase — finding the right symbols, understanding call chains, exploring subsystems, and getting useful context for real tasks.
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## Setup
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### 1. Build and index
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```bash
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npm run build
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rm -rf <codebase_path>/.codegraph
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node dist/bin/codegraph.js init -iv <codebase_path>
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```
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The `-iv` flag gives verbose output showing extraction progress, node/edge counts, and timing.
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### 2. Quick sanity check
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```bash
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# Verify nodes were extracted with proper qualified names
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sqlite3 <codebase_path>/.codegraph/codegraph.db \
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"SELECT name, kind, qualified_name FROM nodes WHERE kind = 'method' LIMIT 10;"
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# GOOD: file.go::StructName::method_name (owner type present)
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# BAD: file.go::file.go::method_name (owner type missing — needs getReceiverType)
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# Check edge counts
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sqlite3 <codebase_path>/.codegraph/codegraph.db \
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"SELECT kind, COUNT(*) FROM edges GROUP BY kind ORDER BY COUNT(*) DESC;"
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# Check node kind distribution
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sqlite3 <codebase_path>/.codegraph/codegraph.db \
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"SELECT kind, COUNT(*) FROM nodes GROUP BY kind ORDER BY COUNT(*) DESC;"
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```
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If methods are missing their owner type in `qualified_name`, fix that first (see [Adding getReceiverType](#adding-getreceivertype)) before proceeding with the full test battery.
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## The Test Battery
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Run **all** of the following test categories against the codebase. Use the Node.js API directly — the test scripts below are templates. Adapt the queries to match real types, methods, and subsystems in the codebase you're testing.
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**Pass criteria for each test:** Does the result give an LLM enough correct information to answer the question or complete the task? Would you trust these results if you were the LLM?
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---
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### Test 1: `codegraph_explore` — Deep Exploration (MOST IMPORTANT)
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This is the primary tool LLMs use. It must return relevant source code grouped by file, with correct relationships, for a natural language query. Test it with **at least 5 different query types**:
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```bash
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node -e "
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const { CodeGraph } = require('./dist/index.js');
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async function test() {
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const cg = await CodeGraph.open('<codebase_path>');
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const queries = [
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// A. Subsystem exploration — broad topic, should find the right files and key classes
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'How does the caching system work?',
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// B. Specific class/type deep dive — should return that class, its methods, and related types
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'CacheBuilder configuration and build process',
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// C. Cross-cutting concern — should find implementations across multiple files
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'How are errors handled and propagated?',
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// D. Data flow question — should trace through multiple layers
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'How does data flow from input to storage?',
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// E. Implementation detail — specific method behavior
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'How does eviction decide which entries to remove?',
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];
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for (const query of queries) {
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console.log(\`\n========================================\`);
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console.log(\`QUERY: \${query}\`);
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console.log(\`========================================\`);
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const subgraph = await cg.findRelevantContext(query, {
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searchLimit: 8, traversalDepth: 3, maxNodes: 80, minScore: 0.2,
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});
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// Show entry points — these are what the LLM sees first
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console.log(\`\nEntry points (\${subgraph.roots.length}):\`);
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for (const rootId of subgraph.roots.slice(0, 8)) {
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const node = subgraph.nodes.get(rootId);
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if (node) console.log(\` \${node.name} (\${node.kind}) — \${node.filePath}:\${node.startLine}\`);
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}
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// Show file distribution — are the right files surfacing?
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const fileGroups = new Map();
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for (const node of subgraph.nodes.values()) {
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if (!fileGroups.has(node.filePath)) fileGroups.set(node.filePath, []);
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fileGroups.get(node.filePath).push(node.name);
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}
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console.log(\`\nFiles (\${fileGroups.size}):\`);
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for (const [file, nodes] of [...fileGroups.entries()].sort((a,b) => b[1].length - a[1].length).slice(0, 8)) {
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console.log(\` \${file} (\${nodes.length} symbols): \${nodes.slice(0, 6).join(', ')}\`);
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}
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// Show edge distribution — are relationships being captured?
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const edgeKinds = new Map();
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for (const edge of subgraph.edges) {
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edgeKinds.set(edge.kind, (edgeKinds.get(edge.kind) || 0) + 1);
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}
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console.log(\`\nEdges (\${subgraph.edges.length}):\`);
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for (const [kind, count] of [...edgeKinds.entries()].sort((a,b) => b - a)) {
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console.log(\` \${kind}: \${count}\`);
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}
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console.log(\`\nTotal: \${subgraph.nodes.size} nodes, \${subgraph.edges.length} edges, \${fileGroups.size} files\`);
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}
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await cg.close();
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}
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test().catch(console.error);
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"
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```
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**What to check for each query:**
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- Do the entry points make sense for the question?
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- Are the right files surfacing (not just test files or unrelated code)?
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- Is there a mix of edge types (calls, contains, extends, implements) — not just `contains`?
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- Does the node count feel right? Too few (<5) means search failed. Too many irrelevant ones means noise.
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---
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### Test 2: `codegraph_search` — Symbol Lookup
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Test that searching for specific symbols returns the right results ranked correctly.
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```bash
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node -e "
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const { CodeGraph } = require('./dist/index.js');
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async function test() {
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const cg = await CodeGraph.open('<codebase_path>');
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const searches = [
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// A. Class by name
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{ query: 'CacheBuilder', kinds: ['class'], desc: 'Find a specific class' },
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// B. Method on a specific type (the classic disambiguation test)
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{ query: 'CacheBuilder build', kinds: ['method'], desc: 'Method on specific class' },
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// C. Common method name — should still find relevant ones
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{ query: 'get', kinds: ['method'], desc: 'Common method name' },
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// D. Interface/trait
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{ query: 'Cache', kinds: ['interface'], desc: 'Find an interface' },
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// E. Enum
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{ query: 'Strength', kinds: ['enum'], desc: 'Find an enum' },
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];
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for (const s of searches) {
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console.log(\`\n--- \${s.desc}: \"\${s.query}\" (kinds: \${s.kinds}) ---\`);
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const results = cg.searchNodes(s.query, { limit: 10, kinds: s.kinds });
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for (const r of results) {
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console.log(\` \${r.score.toFixed(1)} | \${r.node.name} (\${r.node.kind}) | \${r.node.qualifiedName}\`);
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}
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if (results.length === 0) console.log(' *** NO RESULTS ***');
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}
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await cg.close();
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}
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test().catch(console.error);
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"
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```
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**What to check:**
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- Does the target symbol rank in the top 3?
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- For common names like `get`, do the results include qualified names that help disambiguate?
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- Are there zero-result queries? That's a bug.
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---
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### Test 3: `codegraph_callers` / `codegraph_callees` — Call Chain Tracing
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Test that call relationships were extracted correctly.
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```bash
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node -e "
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const { CodeGraph } = require('./dist/index.js');
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async function test() {
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const cg = await CodeGraph.open('<codebase_path>');
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// Pick 3-4 important methods and check their call graphs
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const symbols = ['build', 'get', 'put', 'invalidate'];
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for (const sym of symbols) {
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// Find the symbol
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const results = cg.searchNodes(sym, { limit: 5, kinds: ['method'] });
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if (results.length === 0) { console.log(\`\${sym}: not found\`); continue; }
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const node = results[0].node;
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console.log(\`\n--- \${node.name} (\${node.qualifiedName}) ---\`);
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// Check callees (what does it call?)
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const callees = cg.getCallees(node.id);
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console.log(\` Callees (\${callees.length}): \${callees.slice(0, 10).map(c => c.node.name).join(', ')}\`);
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// Check callers (what calls it?)
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const callers = cg.getCallers(node.id);
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console.log(\` Callers (\${callers.length}): \${callers.slice(0, 10).map(c => c.node.name).join(', ')}\`);
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}
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await cg.close();
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}
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test().catch(console.error);
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"
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```
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**What to check:**
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- Do methods have callers AND callees? If a method has 0 of both, edge extraction may be broken.
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- Do the callers/callees make sense? A `build()` method should call constructor-like things, and be called by setup/initialization code.
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- Are the counts reasonable? A core method in a popular codebase should have multiple callers.
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---
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### Test 4: `codegraph_impact` — Change Impact Analysis
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Test that the impact radius correctly identifies affected code.
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```bash
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node -e "
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const { CodeGraph } = require('./dist/index.js');
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async function test() {
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const cg = await CodeGraph.open('<codebase_path>');
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// Pick a core class or interface that many things depend on
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const results = cg.searchNodes('<CoreClass>', { limit: 1, kinds: ['class', 'interface'] });
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if (results.length === 0) { console.log('Not found'); return; }
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const node = results[0].node;
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console.log(\`Impact analysis for: \${node.name} (\${node.kind}) — \${node.filePath}\`);
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const impact = cg.getImpactRadius(node.id, { depth: 2 });
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console.log(\`\nAffected nodes: \${impact.nodes.size}\`);
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console.log(\`Affected edges: \${impact.edges.length}\`);
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// Group by file
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const files = new Map();
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for (const n of impact.nodes.values()) {
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if (!files.has(n.filePath)) files.set(n.filePath, []);
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files.get(n.filePath).push(n.name);
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}
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console.log(\`Affected files: \${files.size}\`);
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for (const [file, nodes] of [...files.entries()].sort((a,b) => b[1].length - a[1].length).slice(0, 10)) {
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console.log(\` \${file}: \${nodes.slice(0, 5).join(', ')}\`);
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}
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await cg.close();
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}
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test().catch(console.error);
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"
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```
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**What to check:**
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- Does changing a core interface/class show a wide impact radius?
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- Are the affected files reasonable (things that import/extend/use it)?
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- Is the impact radius non-empty? Zero impact on a core type means edges are missing.
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---
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### Test 5: Edge Extraction Quality
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Directly verify that the major edge types are being extracted for this language.
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```bash
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node -e "
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const { CodeGraph } = require('./dist/index.js');
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async function test() {
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const cg = await CodeGraph.open('<codebase_path>');
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// Check overall edge distribution
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console.log('=== Edge distribution ===');
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// (Use sqlite3 query from sanity check above)
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// Find a class that extends another
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const classes = cg.searchNodes('', { limit: 100, kinds: ['class'] });
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let foundExtends = false, foundImplements = false;
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for (const r of classes) {
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const callees = cg.getCallees(r.node.id);
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// getCallees returns all outgoing edges, check for extends/implements
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// Better: use graph traversal
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}
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// Verify specific relationship types exist
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const checks = [
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{ desc: 'contains edges (class → method)', query: 'SELECT COUNT(*) FROM edges WHERE kind = \"contains\"' },
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{ desc: 'calls edges', query: 'SELECT COUNT(*) FROM edges WHERE kind = \"calls\"' },
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{ desc: 'imports edges', query: 'SELECT COUNT(*) FROM edges WHERE kind = \"imports\"' },
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{ desc: 'extends edges', query: 'SELECT COUNT(*) FROM edges WHERE kind = \"extends\"' },
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{ desc: 'implements edges', query: 'SELECT COUNT(*) FROM edges WHERE kind = \"implements\"' },
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];
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// Run these via sqlite3 (shown in sanity check section)
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await cg.close();
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}
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test().catch(console.error);
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"
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```
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```bash
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sqlite3 <codebase_path>/.codegraph/codegraph.db "
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SELECT kind, COUNT(*) as cnt FROM edges GROUP BY kind ORDER BY cnt DESC;
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"
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```
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**What to check:**
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- `contains` should be the most common (structural hierarchy).
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- `calls` should be plentiful — if near zero, call extraction is broken for this language.
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- `imports` should exist — if zero, import parsing is broken.
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- `extends` and `implements` should exist if the language has inheritance — if zero, `extractInheritance()` may not handle this language's AST.
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---
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### Test 6: Node Extraction Completeness
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Verify all expected node kinds are being extracted.
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```bash
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sqlite3 <codebase_path>/.codegraph/codegraph.db "
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SELECT kind, COUNT(*) as cnt FROM nodes GROUP BY kind ORDER BY cnt DESC;
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"
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```
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**What to check for each language:**
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| Node Kind | Expected? | Notes |
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|-----------|-----------|-------|
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| `file` | Always | One per source file |
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| `class` | If language has classes | |
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| `method` | If language has methods | Should include owner type in `qualified_name` |
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| `function` | If language has top-level functions | |
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| `interface` | If language has interfaces/protocols | |
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| `enum` | If language has enums | |
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| `enum_member` | If language has enums | Values inside enums |
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| `import` | Always | One per import statement |
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| `variable` / `field` | Usually | Fields, constants, top-level vars |
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| `struct` | If language has structs | Go, Rust, C, Swift |
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| `trait` | If language has traits | Rust |
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If an expected node kind has 0 count, the language extractor is missing that AST type.
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---
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### Test 7: Real-World LLM Prompts
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This is the final and most important test. Simulate the kinds of questions a developer would actually ask an LLM that's using CodeGraph. For each prompt, run `findRelevantContext` (which powers `codegraph_explore`) and evaluate whether the returned context would let an LLM give a correct, complete answer.
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**Run at least 5 of these prompt styles, adapted to the actual codebase:**
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```bash
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node -e "
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const { CodeGraph } = require('./dist/index.js');
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async function test() {
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const cg = await CodeGraph.open('<codebase_path>');
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const prompts = [
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// 1. \"How does X work?\" — subsystem understanding
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'How does the cache eviction policy work?',
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// 2. \"Where is X implemented?\" — symbol location
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'Where is the LRU eviction logic implemented?',
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// 3. \"What calls X?\" — usage discovery
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'What code triggers cache invalidation?',
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// 4. \"I want to change X, what breaks?\" — impact assessment
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'If I change the Cache interface, what else is affected?',
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// 5. \"How do X and Y interact?\" — cross-component relationships
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'How does CacheBuilder connect to LocalCache?',
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// 6. \"Show me the flow from A to B\" — data/control flow
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'What happens when a cache entry expires?',
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// 7. \"What are all the implementations of X?\" — polymorphism
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'What classes implement the Cache interface?',
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// 8. Bug investigation prompt
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'Cache entries are not being evicted when they should be — where should I look?',
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];
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for (const prompt of prompts) {
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console.log(\`\n========================================\`);
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console.log(\`PROMPT: \${prompt}\`);
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console.log(\`========================================\`);
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const subgraph = await cg.findRelevantContext(prompt, {
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searchLimit: 8, traversalDepth: 3, maxNodes: 80, minScore: 0.2,
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});
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console.log(\`Result: \${subgraph.nodes.size} nodes, \${subgraph.edges.length} edges, \${subgraph.roots.length} entry points\`);
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console.log('Entry points:');
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for (const rootId of subgraph.roots.slice(0, 5)) {
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const node = subgraph.nodes.get(rootId);
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if (node) console.log(\` \${node.name} (\${node.kind}) — \${node.filePath}:\${node.startLine}\`);
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}
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const fileGroups = new Map();
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for (const node of subgraph.nodes.values()) {
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if (!fileGroups.has(node.filePath)) fileGroups.set(node.filePath, []);
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fileGroups.get(node.filePath).push(node.name);
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}
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console.log('Top files:');
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for (const [file, nodes] of [...fileGroups.entries()].sort((a,b) => b[1].length - a[1].length).slice(0, 5)) {
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console.log(\` \${file} (\${nodes.length}): \${nodes.slice(0, 5).join(', ')}\`);
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}
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// PASS/FAIL judgment
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const hasEntryPoints = subgraph.roots.length > 0;
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const hasEdges = subgraph.edges.length > 0;
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const hasMultipleFiles = fileGroups.size > 1;
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console.log(\`\\nVERDICT: \${hasEntryPoints && hasEdges && hasMultipleFiles ? 'PASS' : 'FAIL — needs investigation'}\`);
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}
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await cg.close();
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}
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test().catch(console.error);
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"
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```
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**What to check for each prompt:**
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- Does it return entry points? Zero entry points = total failure.
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- Are the entry points **relevant** to the question? (Not just random symbols that happen to share a word.)
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- Does it span multiple files? Most real questions involve cross-file understanding.
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- Are relationships present? An LLM needs to understand how symbols connect, not just a list of names.
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- Would **you** be able to answer the question from this context?
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---
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## Diagnosing Failures
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| Symptom | Likely Cause | Where to Fix |
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|---------|-------------|--------------|
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| Method missing owner type in `qualified_name` | Language needs `getReceiverType` | `src/extraction/languages/<lang>.ts` |
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| `codegraph_explore` returns irrelevant files | Common names flooding FTS; co-location boost not helping | `src/db/queries.ts: findNodesByExactName`, `src/context/index.ts` |
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| Zero `calls` edges | `callTypes` missing or wrong AST node type | `src/extraction/languages/<lang>.ts: callTypes` |
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| Zero `extends`/`implements` edges | `extractInheritance()` doesn't handle this language's AST | `src/extraction/tree-sitter.ts: extractInheritance()` |
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| Missing node kinds (no enums, no interfaces) | AST type not listed in extractor | `src/extraction/languages/<lang>.ts: enumTypes`, `interfaceTypes`, etc. |
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| Search term dropped from query | Term is in the stop words list | `src/search/query-utils.ts: STOP_WORDS` |
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| `qualified_name` missing class for nested methods | Extraction not walking parent stack correctly | `src/extraction/tree-sitter.ts: visitNode()` |
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| Import edges missing | `extractImport` returns null for this syntax | `src/extraction/languages/<lang>.ts: extractImport` |
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## After Fixing Issues
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```bash
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npm run build
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|
rm -rf <codebase_path>/.codegraph
|
|
node dist/bin/codegraph.js init -iv <codebase_path>
|
|
# Re-run the failing tests from above
|
|
```
|
|
|
|
Always run the full test suite before marking a language as verified:
|
|
|
|
```bash
|
|
npm test
|
|
```
|
|
|
|
## Adding `getReceiverType`
|
|
|
|
**Only needed for languages where methods are top-level or outside their owner type in the AST.** If the language nests methods inside class/struct bodies (Python, Java, TypeScript, C#), the qualified name already includes the parent — verify with the sanity check before adding anything.
|
|
|
|
### 1. Add the hook to the language extractor
|
|
|
|
In `src/extraction/languages/<lang>.ts`, add `getReceiverType` to the extractor object:
|
|
|
|
```typescript
|
|
getReceiverType: (node, source) => {
|
|
// Extract the owner type name from the method's AST node.
|
|
// Return the type name string, or undefined if not applicable.
|
|
//
|
|
// The core extractMethod() in tree-sitter.ts will use this to set:
|
|
// qualifiedName = `${filePath}::${receiverType}::${methodName}`
|
|
},
|
|
```
|
|
|
|
### 2. Reference: Go implementation
|
|
|
|
```typescript
|
|
// src/extraction/languages/go.ts
|
|
getReceiverType: (node, source) => {
|
|
const receiver = getChildByField(node, 'receiver');
|
|
if (!receiver) return undefined;
|
|
const text = getNodeText(receiver, source);
|
|
const match = text.match(/\*?\s*([A-Za-z_][A-Za-z0-9_]*)\s*\)/);
|
|
return match?.[1];
|
|
},
|
|
```
|
|
|
|
### 3. Where it's consumed
|
|
|
|
`src/extraction/tree-sitter.ts` in `extractMethod()`:
|
|
|
|
```typescript
|
|
const receiverType = this.extractor.getReceiverType?.(node, this.source);
|
|
if (receiverType) {
|
|
extraProps.qualifiedName = `${this.filePath}::${receiverType}::${name}`;
|
|
}
|
|
```
|
|
|
|
## Key Files
|
|
|
|
| File | Role |
|
|
|------|------|
|
|
| `src/extraction/languages/<lang>.ts` | Language extractor — node types, call types, `getReceiverType` |
|
|
| `src/extraction/tree-sitter.ts` | Core extraction — `extractMethod()`, `extractCall()`, `extractInheritance()` |
|
|
| `src/extraction/tree-sitter-types.ts` | `LanguageExtractor` interface definition |
|
|
| `src/search/query-utils.ts` | `STOP_WORDS`, `extractSearchTerms`, `scorePathRelevance` |
|
|
| `src/db/queries.ts` | `searchNodesFTS` (BM25), `findNodesByExactName` (co-location boost) |
|
|
| `src/context/index.ts` | `findRelevantContext` — hybrid search + graph traversal |
|
|
| `src/mcp/tools.ts` | MCP tool handlers — `codegraph_explore` implementation |
|
|
|
|
## Language Status
|
|
|
|
### Verified
|
|
|
|
- [x] **Go** — `getReceiverType` extracts receiver from `func (sl *Type) method()`
|
|
- [x] **Swift** — NOT needed. Tree-sitter nests methods inside class/extension bodies
|
|
- [x] **Java** — NOT needed. Methods nested in class body. Verified against Guava
|
|
|
|
### Needs Verification
|
|
|
|
Check these — may need `getReceiverType` if methods are top-level in the AST:
|
|
|
|
- [ ] Rust — methods in `impl Type { }` blocks
|
|
- [ ] C++ — out-of-class method definitions `Type::method()`
|
|
- [ ] Kotlin — extension functions `fun Type.method()`
|
|
|
|
Verify these DON'T need `getReceiverType` (methods nested in class body):
|
|
|
|
- [ ] Python
|
|
- [ ] TypeScript
|
|
- [ ] C#
|