feat: Rewrite packages/logging in TypeScript

[Copilot]

Rewrites @tryghost/logging from JavaScript to TypeScript, following established monorepo conventions (errors, prometheus-metrics).

Structure

• src/GhostLogger.ts — typed rewrite with exported interfaces (GhostLoggerOptions, LogLevel, TransportName, per-transport config types)
• src/index.ts — typed entry point; loads loggingrc, exports logger instance via export = for backwards-compatible CJS shape
• src/types/declarations.d.ts — ambient declarations for untyped deps: gelf-stream, @tryghost/pretty-stream, @tryghost/http-stream, @tryghost/elasticsearch, @tryghost/bunyan-rotating-filestream, @tryghost/root-utils
• test/logging.test.ts — test file converted to TypeScript

Config

tsconfig.json extends the monorepo root: strict, noImplicitAny, ES2022 target, CommonJS output to build/. ESLint rules updated to plugin:ghost/ts / plugin:ghost/ts-test.

Package

main → build/index.js, types → build/index.d.ts. Added typescript, ts-node, and @types/* devDependencies. Build runs via tsc; prepare script ensures build/ is always present on install.

Public API example

import logging from '@tryghost/logging';
import { GhostLogger, GhostLoggerOptions } from '@tryghost/logging';

// Consumers get typed options
const logger = new GhostLogger({
    transports: ['stdout', 'file'],
    level: 'info',
    rotation: { enabled: true, period: '1d', count: 7 }
});

Old JS require('@tryghost/logging') consumers are unaffected — the export = pattern preserves the original module.exports = loggerInstance CJS shape.

Original prompt

Create a plan step by step for rewriting packages/logging in typescript.

Use the latest version of typescript.

Start by doing research on how the package works -- what is its public interface, how is logging configured, etc. document the specification in A detailed document.

Then, create a plan for implementing the rewrite. Include technical details like how the file structure will change, how typescript should be configured (strict, no any allowed, etc.)

Break the plan down into tasks, and note which tasks can be done in parallel, and the dependency between the tasks.

Take the tasks and create a plan for 2-8 engineers to optimally execute the tasks.

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[cmraible]

This was just a little experiment with Copilot