import type { FrontmatterSchemaEntry } from "./options.js";
/**
 * Minimal shape of the upstream `VirtualCodePlugin` contract
 * (`@mdx-js/language-service`): a factory returning an object that can visit
 * mdast nodes and emit a JS string appended to the virtual `.jsx` file.
 */
export interface VirtualCodePluginObject {
    visit?(node: {
        type: string;
    }): void;
    finalize(): string;
}
export type VirtualCodePlugin = () => VirtualCodePluginObject;
/** A function that returns the frontmatter schema entry matching a file, if any. */
export type FrontmatterMatcher = (file: string | undefined) => FrontmatterSchemaEntry | undefined;
/** Compile the glob matchers once and reuse them across files in a program. */
export declare function createFrontmatterMatcher(entries: FrontmatterSchemaEntry[]): FrontmatterMatcher;
/**
 * A VirtualCodePlugin that types the document's `frontmatter` export.
 *
 * Upstream emits `export const frontmatter = /** @type {any} *\/ (undefined)`.
 * We replace `any` with the schema type declared for the file's glob, so
 * `{frontmatter.title}` usages in the body are checked against it. The current
 * file is read from `getFile()` — safe because upstream instantiates and runs
 * plugins synchronously inside `createVirtualCode`, which our language-plugin
 * wrapper wraps to set that value first. (Checking of the frontmatter *values*
 * is layered on separately in the wrapper, since the plugin seam carries no
 * source mappings.)
 */
export declare function createFrontmatterPlugin(getFile: () => string | undefined, match: FrontmatterMatcher, exportName?: string): VirtualCodePlugin;
export declare function stripExtension(modulePath: string): string;