istanbul-lib-processinfo

import { ProcessDB, ProcessInfo } from 'istanbul-lib-processinfo'; import * as path from 'path'; import * as fs from 'fs/promises'; async function main() { const tempDir = path.join(process.cwd(), '.temp_processinfo_data'); await fs.mkdir(tempDir, { recursive: true }); console.log(`Working in temporary directory: ${tempDir}`); // Create a ProcessDB instance for the temporary directory const processDB = new ProcessDB(tempDir); await processDB.writeIndex(); // Ensure index.json exists // Simulate a root process info const rootProcessInfo = new ProcessInfo({ uuid: 'root-process-id-123', directory: tempDir, args: ['node', 'root.js'], externalId: 'main-app' }); await rootProcessInfo.save(); console.log(`Root process info saved: ${rootProcessInfo.uuid}.json`); // Simulate a child process using spawn // Note: in a real scenario, 'nyc' would wrap the spawned command. // For this example, we mock a successful spawn. console.log('Spawning a mock child process...'); // The actual `spawn` would return a ChildProcess, but we're simulating // for demonstration purposes without executing an actual child process. // A real spawn would look like: await processDB.spawn('child1', 'node', ['child.js'], {cwd: tempDir}); // Instead, manually create a child process info to illustrate data structure const childProcessInfo = new ProcessInfo({ uuid: 'child-process-id-456', directory: tempDir, args: ['node', 'child.js'], externalId: 'feature-module' }); await childProcessInfo.save(); console.log(`Child process info saved: ${childProcessInfo.uuid}.json`); // To build the tree and get coverage map, a (mock) nyc instance is required const mockNyc = { // Minimal mock for nyc properties needed by istanbul-lib-processinfo instrumenter: { /* ... */ }, sourceMaps: true, cache: true, exclude: [], include: [] }; await processDB.buildProcessTree(); const coverageMap = await processDB.getCoverageMap(mockNyc); console.log('Successfully built process tree and retrieved coverage map (mock).'); // In a real scenario, coverageMap would contain actual coverage data console.log(`Coverage Map's unique key count: ${Object.keys(coverageMap.data).length}`); // Clean up await fs.rm(tempDir, { recursive: true, force: true }); console.log(`Cleaned up temporary directory: ${tempDir}`); } main().catch(console.error);