export type CoreExtension = '.js' | '.mjs' | '.cjs' | '.json';
export declare const CoreExtensions: CoreExtension[];
export declare function isCoreExtension(value: string): value is CoreExtension;
type CoreExtensionMapping = {
    [key in CoreExtension]: string[];
};
/**
 * Unlike TypeScript's native lookup order, our lookup order prefers
 * implementation files to declaration files.
 *
 * Why include declaration files at all? Some of our users use manually
 * created declaration files as essentially shared header files without a
 * corresponding implementation file, and the declaration is the only thing
 * we'll be able to find. Otherwise we'd complain about a missing dependency.
 *
 * @see https://www.typescriptlang.org/docs/handbook/modules/reference.html#file-extension-substitution
 */
export declare const tsCoreExtensionLookupOrder: CoreExtensionMapping;
export type TSExtension = '.ts' | '.mts' | '.cts' | '.tsx';
export declare const TSExtensions: TSExtension[];
export declare function isTSExtension(value: string): value is TSExtension;
type TSExtensionMapping = {
    [key in TSExtension]: string[];
};
export declare const tsExtensionLookupOrder: TSExtensionMapping;
export declare class FileExtPath {
    filePath: string;
    ext: string;
    private constructor();
    static fromFilePath(filePath: string): FileExtPath;
    hasCoreExtension(): boolean;
    hasTypeScriptExtension(): boolean;
    replaceExt(ext: string): string;
    appendExt(ext: string): string;
    resolve(...paths: string[]): string;
    self(): string;
}
export {};