extendTheme

Produces a new theme object by layering overrides on top of an existing theme: top-level keys replace same-named tokens, dark blocks are shallow-merged. The base object is not mutated.

/**
 * Produces a new theme object by layering overrides on top of an existing
 * theme: top-level keys replace same-named tokens, `dark` blocks are
 * shallow-merged. The base object is not mutated.
 *
 * @param base The token map to extend.
 * @param overrides Token overrides — keyed by the base theme's tokens, custom
 *   keys accepted.
 */
function extendTheme<TBase extends Record<string, any>>(
  base: TBase,
  overrides: InferThemeTokens<TBase>
): TBase