/**
 * A capability/loss feature name. A plain string, hierarchical via dot-segments
 * (`'tables.nested'` ⊂ `'tables'`); the vocabulary is OPEN so third-party
 * adapters can introduce their own. {@link FEATURES} canonicalizes the names the
 * core uses.
 */
export type Feature = string;
/** The feature names the core declares, so the docs' capability matrix is code-generated. */
export declare const FEATURES: {
    readonly text: "text";
    readonly tables: "tables";
    readonly tablesNested: "tables.nested";
    readonly cellFormatting: "cellFormatting";
    readonly lists: "lists";
    readonly sections: "sections";
    readonly headersFooters: "headersFooters";
    readonly images: "images";
    readonly imagesJp2: "images.jp2";
    readonly hyperlinks: "hyperlinks";
    readonly shapes: "shapes";
    readonly smartArt: "shapes.smartArt";
    readonly charts: "charts";
    readonly math: "math";
    readonly rtl: "rtl";
    readonly trackedChanges: "trackedChanges";
    readonly hyphenation: "hyphenation";
    readonly fontsEmbedding: "fonts.embedding";
    readonly fontsSubstitution: "fonts.substitution";
    readonly pdfA: "pdf.archival";
    readonly pdfTagged: "pdf.tagged";
    readonly pdfSignatures: "pdf.signatures";
};
/** Union of the canonical {@link FEATURES} values. */
export type KnownFeature = (typeof FEATURES)[keyof typeof FEATURES];
/** True when `feature` equals `prefix` or sits under it ('tables.nested' ⊂ 'tables'). */
export declare function featureWithin(feature: Feature, prefix: Feature): boolean;