import type * as Template from '../serial/serial-types.js';
/**
 * Make provided font bytes available to text MEASUREMENT before conversion runs,
 * and attach the matching `@font-face` document to each serial for the RENDERER.
 *
 * The point is atomicity: bluepic-core measures text against whatever font set is
 * registered in the ambient canvas registry — `document.fonts` in the browser,
 * skia's `FontLibrary` under headless. If a font isn't there yet, measureText
 * silently returns FALLBACK metrics and the converter bakes wrong geometry. So we
 * register the bytes into that SAME registry and AWAIT real availability first.
 *
 * The serial `Template.Font.src` is a CSS document built by the ONE shared builder
 * ({@link buildBluepicFontCSSDocument}) whose `@font-face` `src`s are self-contained
 * `data:` URLs — the SAME document a persisting consumer uploads to the font cloud,
 * so the preview and the upload can never disagree. (Browser: the document is served
 * over a session `blob:` URL to keep the serial JSON small; Node: a `data:text/css`
 * URL so it's fully portable.)
 */
export type LoadableFace = {
    weight: number;
    italic: boolean;
    bytes: ArrayBuffer;
    fileName?: string;
};
export type LoadableFont = {
    family: string;
    faces: LoadableFace[];
};
/**
 * Register `fonts` into the ambient measurement registry and await availability.
 * No-op for an empty list. Returns the serial `Template.Font[]` to attach.
 */
export declare function loadFontsForMeasurement(fonts: LoadableFont[]): Promise<Template.Font[]>;
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