TypeScript declaration conventions

When writing or updating .d.ts files, follow idiomatic TypeScript conventions to keep type declarations concise and consistent:

• Avoid duplicating type definitions or their documentation. If a type already exists (locally or in an external package), re-export it instead of redefining it.
• Prefer explicit re-exports from the source module (e.g., export { ColorInfo, ColorSupport, ColorSupportLevel } from 'supports-color';) rather than inlining or copying type bodies. Group these re-exports together, typically at the bottom of the file.
• Mark array-typed exports as readonly when the underlying value is not meant to be mutated, e.g. export const modifiers: readonly Modifiers[];.
• Use method shorthand syntax for interface members instead of arrow-function-typed properties, e.g. prefer:

  interface Chalk {
  	rgb(r: number, g: number, b: number): Chalk;
  }
  

  over

  interface Chalk {
  	rgb: (r: number, g: number, b: number) => Chalk;
  }
  

Following these conventions reduces duplication, keeps declaration files easier to maintain, and aligns with common TypeScript style used across the ecosystem.</description>