youch-core

import { ErrorParser, ParsedError, StackFrame } from 'youch-core'; async function main() { const error = new Error('Failed to process user input'); // Simulating a more complex stack for demonstration error.stack = `Error: Failed to process user input\n at validateInput (file:///path/to/project/src/utils/validation.ts:15:20)\n at processRequest (file:///path/to/project/src/handlers/apiHandler.ts:30:10)\n at Router.dispatch (node:internal/deps/undici/undici.js:123:45)\n at Server.<anonymous> (file:///path/to/project/src/server.ts:8:5)`; const parser = new ErrorParser(); // Optionally, define a custom source loader if files are not on disk parser.defineSourceLoader(async (frame: StackFrame) => { if (frame.fileName && frame.type === 'file') { // In a real application, you might fetch source code from a build artifact, // a CDN, or an in-memory map. // For this example, we'll just mock a source line. if (frame.fileName.includes('validation.ts')) { frame.source = [' ', ' function validateInput(data: any) {', ' if (!data.isValid) { throw new Error("Invalid data"); }', ' }']; } else if (frame.fileName.includes('apiHandler.ts')) { frame.source = [' ', ' async function processRequest(req: Request) {', ' await validateInput(req.body);', ' }']; } } }); const parsedError: ParsedError = await parser.parse(error); console.log(`Error Message: ${parsedError.message}`); console.log(`Original Stack: ${parsedError.error.stack?.split('\n')[0]}...`); console.log(`Total Frames: ${parsedError.frames.length}\n`); console.log('--- Key Stack Frames ---'); // Iterate over application-specific frames, excluding node_modules and native calls parsedError.frames .filter(f => !f.isNodeModule && !f.isNative) .slice(0, 5) // Show top 5 relevant frames .forEach((frame, index) => { console.log(`Frame ${index + 1}:`); console.log(` Method: ${frame.method || '[anonymous]'}`); console.log(` File: ${frame.fileName || '[unknown file]'}:${frame.lineNumber || '?'}`); if (frame.source && frame.source.length > 0) { const lineIndex = (frame.lineNumber ?? 1) - 1; const sourceLine = frame.source[lineIndex]?.trim(); console.log(` Code: ${sourceLine || '[Source unavailable]'}`); } else { console.log(' Code: [Source not loaded]'); } console.log(''); }); } main().catch(console.error);