import type { PostextConfig, Resource } from '../types.js';
import type { ConfigWarning } from '../vdt.js';
/** Where the checks read their context. */
export interface ValidatePageTemplatesOptions {
    /** The book's resources: their anchors' `style` is checked against
     *  `labelStyles` (`labelStyleUnknown`). */
    resources?: readonly Resource[];
    /** Pixels per inch and the body text size in px, for comparing a
     *  minimum with a maximum in different units. Default 96 and 16. */
    dpi?: number;
    baseFontSizePx?: number;
}
/**
 * Every problem of `config.pageTemplates` and `config.labelStyles` (and of
 * the same keys under `htmlViewer.overrides`), as config warnings with a
 * JSON-pointer `path`: the kinds listed on {@link ConfigWarning}, plus
 * `unknownConfigKey` for a key no template, frame, group, grid, fit,
 * overflow, variant, label style, placement (its anchor, offset and size)
 * or decoration has, and `unknownConfigValue` for a word
 * outside a setting's choices (`area`, `verticalAlign`, `exclude`, `takes`,
 * `kind`, `align`, `writingMode`, `direction`, `overlap`, `fontStyle`,
 * `textTransform`) or a template with no id or a frame or group with no
 * name (ignored). `resolvePageTemplate` makes the same fixes the warnings
 * describe. Pure.
 */
export declare function validatePageTemplates(config: PostextConfig | undefined, options?: ValidatePageTemplatesOptions): ConfigWarning[];
/** An `opacity` (#1079): a number in 0…1. Out of range: held (`used` the
 *  held value); not a number: opaque (`used: '1'`). */
export declare function opacityWarning(value: unknown, path: string): ConfigWarning | undefined;
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