MCPify

import type { TestLoggingLibrary } from 'loglayer'; import { expect } from 'vitest'; /** * A matcher that allows defining expected log messages using a callback syntax * * @example * expect(testLogger).toHaveLogged((l) => { * l.error('Error message', 'details'); * l.info('Info message'); * }); */ interface LogRecorder { error: (...args: unknown[]) => void; warn: (...args: unknown[]) => void; info: (...args: unknown[]) => void; debug: (...args: unknown[]) => void; log: (...args: unknown[]) => void; } interface LogEntry { level: string; data: unknown[]; } type LogCallback = (logger: LogRecorder) => void; expect.extend({ toHaveLogged(received: TestLoggingLibrary, callback: LogCallback) { // Create a recorder to capture expected log calls const expectedLogs: LogEntry[] = []; // Create a logger proxy that records expected calls const recorder: LogRecorder = { error: (...args) => expectedLogs.push({ level: 'error', data: args }), warn: (...args) => expectedLogs.push({ level: 'warn', data: args }), info: (...args) => expectedLogs.push({ level: 'info', data: args }), debug: (...args) => expectedLogs.push({ level: 'debug', data: args }), log: (...args) => expectedLogs.push({ level: 'log', data: args }), }; // Invoke the callback to record expected logs callback(recorder); // Get the actual logs from the TestLoggingLibrary const actualLogs = received.lines; return { pass: false, expected: expectedLogs.map((log) => [log.level, ...log.data]), actual: actualLogs.map((log) => [log.level, ...(log.data as unknown[])]), message: () => `Expected logs to include the specified messages.`, }; }, }); // Augment the Vitest types using ES2015 module syntax // Use module declaration merging instead of namespace declare module 'vitest' { interface Assertion { toHaveLogged(callback: LogCallback): void; } interface AsymmetricMatchersContaining { toHaveLogged(callback: LogCallback): void; } }