import * as ts from 'typescript';
export declare class HostBase implements ts.CompilerHost {
    fileExists(fileName: string): boolean;
    directoryExists(directoryName: string): boolean;
    readFile(fileName: string): string;
    getSourceFile(fileName: string, languageVersion: ts.ScriptTarget, onError?: (message: string) => void): ts.SourceFile;
    writeFile(name: string, text: string, writeByteOrderMark: boolean): void;
    useCaseSensitiveFileNames(): boolean;
    getCanonicalFileName(fileName: string): string;
    getCurrentDirectory(): string;
    getNewLine(): string;
    getDefaultLibFileName(options: ts.CompilerOptions): string;
    getCancellationToken(): ts.CancellationToken;
    getDirectories(path: string): string[];
}
export declare class ChainableHost extends HostBase {
    protected source: ts.CompilerHost;
    setSource(source: ts.CompilerHost): void;
    fileExists(fileName: string): boolean;
    directoryExists(directoryName: string): boolean;
    getCurrentDirectory(): string;
    readFile(fileName: string): string;
    getSourceFile(fileName: string, languageVersion: ts.ScriptTarget, onError?: (message: string) => void): ts.SourceFile;
    writeFile(name: string, text: string, writeByteOrderMark: boolean): void;
    getDirectories(path: string): string[];
}
export declare function chainHosts(host0: ts.CompilerHost, ...chainableHosts: ChainableHost[]): ts.CompilerHost;