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: ```ts interface Chalk { rgb(r: number, g: number, b: number): Chalk; } ``` over ```ts 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.