import { PopupModal, StyleProps } from './types';
/**
 * The host business's visual identity, as the embedding app knows it (Creaditor
 * resolves it from the minted token). Everything is optional: a host without a
 * business context passes nothing and the built-in defaults apply.
 *
 * Only `primaryColor` is consumed today — it becomes the submit button's fill.
 * `logoUrl` and `name` are carried so the host can pass its whole context in one
 * object and later features can read them without a breaking change.
 */
export interface BrandContext {
    /** Primary brand color, any CSS color. Defaults the submit button's fill. */
    primaryColor?: string;
    /** Business logo URL. Not consumed yet. */
    logoUrl?: string;
    /** Business display name. Not consumed yet. */
    name?: string;
}
/** The submit button fill when there's no brand color: the stylesheet's own default. */
export declare const DEFAULT_SUBMIT_BACKGROUND = "#111827";
/**
 * The submit button fill that applies to `item`, for the builder's swatch
 * placeholder: the author's own color if they set one, else the brand color,
 * else black.
 */
export declare function submitBackground(style: StyleProps | undefined, brand?: BrandContext): string;
/**
 * Fills the brand color into every submit button that hasn't been given one,
 * returning the same form object when there's nothing to change (so callers can
 * skip a no-op update with `!==`).
 *
 * Only *unset* colors are filled: an author who picked a color keeps it, and so
 * does a template that ships a deliberate one (the image-behind layouts use a
 * white CTA so it reads over the photo). The label color is set alongside the
 * fill, since a light brand color would leave the stylesheet's white text
 * unreadable.
 */
export declare function withBrandSubmitColor(popup: PopupModal, brand?: BrandContext): PopupModal;
/**
 * A readable label color for a button fill: white on dark, near-black on light.
 * Uses the WCAG relative-luminance formula, and falls back to white for any
 * color it can't parse (named colors, `oklch()`, `var()`…) — that matches the
 * stylesheet's default pairing, so an unparseable value is no worse than today.
 */
export declare function readableLabelOn(background: string): string;