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Design Principles

1. Developer Experience First (DX)

Goal: Zero configuration for 90% of use cases.
Example: createLineApp sets up everything needed for a bot. ctx.replyText is a shortcut for replyMessage with a text object.

2. Explicit over Implicit

Goal: No "magic" global state or hidden side effects.
Example: Config is passed explicitly to factories. Handlers are explicit functions.

3. Modular & Composable

Goal: Pay only for what you use.
Example: If you only need Login, install @linekit/login. If you want to use Fastify instead of Express, swap the adapter. Core logic remains the same.

4. Framework Agnostic

Goal: Core logic should not depend on express, koa, or next.
Implementation: @linekit/core uses generic req/res patterns or pure functional logic where possible. Adapters bridge the gap.

5. Type Safety

Goal: Full TypeScript support without manual casting.
Implementation: All events and config are typed. Methods return typed Promises.