Cursor rule

1---
2description: TypeScript strictness and architecture rules for background, popup, and shared modules
3globs: ["src/**/*.ts", "src/**/*.tsx"]
4alwaysApply: false
5---
6 
7TypeScript and architecture rules:
8- Keep `strict: true` assumptions intact.
9- Prefer explicit types for messages, storage records, and extension state.
10- Use shared types/interfaces for communication between background, popup, and shared modules.
11- Avoid leaking browser-specific implementation details across unrelated modules.
12 
13Architecture guidance:
14- Keep business logic separate from UI rendering code.
15- Keep popup logic thin; prefer shared helpers or background-driven flows for non-trivial logic.
16- Reuse existing utilities before creating new abstractions.
17- Prefer pure functions for parsing, transformation, validation, and state mapping.
18- Use guard clauses and narrow types instead of deeply nested conditionals.