typescript

TypeScript Code Style Guide

Types and Type Safety

• Avoid explicit type annotations when TypeScript can infer

• Avoid implicitly any; explicitly type when necessary

• Use accurate types: prefer Record<PropertyKey, unknown> over object or any

• Prefer interface for object shapes (e.g., React props); use type for unions/intersections

• Prefer as const satisfies XyzInterface over plain as const

• Prefer @ts-expect-error over @ts-ignore over as any

• Avoid meaningless null/undefined parameters; design strict function contracts

• Prefer ES module augmentation (declare module '...') over namespace; do not introduce namespace-based extension patterns

• When a type needs extensibility, expose a small mergeable interface at the source type and let each feature/plugin augment it locally instead of centralizing all extension fields in one registry file

• For package-local extensibility patterns like PipelineContext.metadata, define the metadata fields next to the processor/provider/plugin that reads or writes them

Async Patterns

• Prefer async/await over callbacks or .then() chains

• Prefer async APIs over sync ones (avoid *Sync)

• Use promise-based variants: import { readFile } from 'fs/promises'

• Use Promise.all, Promise.race for concurrent operations where safe

Imports

• This project uses simple-import-sort/imports and consistent-type-imports (fixStyle: 'separate-type-imports')

• Separate type imports: always use import type { ... } for type-only imports, NOT import { type ... } inline syntax

• When a file already has import type { ... } from a package and you need to add a value import, keep them as two separate statements:

import type { ChatTopicBotContext } from '@lobechat/types';
import { RequestTrigger } from '@lobechat/types';

• Within each import statement, specifiers are sorted alphabetically by name

Code Structure

• Prefer object destructuring

• Use consistent, descriptive naming; avoid obscure abbreviations

• Replace magic numbers/strings with well-named constants

• Defer formatting to tooling

UI and Theming

• Use @lobehub/ui, Ant Design components instead of raw HTML tags

• Design for dark mode and mobile responsiveness

• Use antd-style token system instead of hard-coded colors

Performance

• Prefer for…of loops over index-based for loops

• Reuse existing utils in packages/utils or installed npm packages

• Query only required columns from database

Time Consistency

• Assign Date.now() to a constant once and reuse for consistency

Logging

• Never log user private information (API keys, etc.)

• Don't use import { log } from 'debug' directly (logs to console)

• Use console.error in catch blocks instead of debug package

• Always log the error in .catch() callbacks — silent .catch(() => fallback) swallows failures and makes debugging impossible

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