import { DiffResult, TerminalEncoding } from "../../internal.mjs";
/**
 * Generates a diff of two Strings.
 */
declare class DiffGenerator {
    private readonly encoding;
    private readonly paddingMarker;
    private readonly simplifyDeltas;
    /**
     * @param encoding - the terminal encoding
     * @throws AssertionError if `encoding` is `undefined` or `null`
     */
    constructor(encoding: TerminalEncoding);
    /**
     * @returns the padding character used to align values vertically
     */
    private getPaddingMarker;
    /**
     * Generates the diff of two strings.
     * <p>
     * <b>NOTE</b>: Colors may be disabled when stdin or stdout are redirected. To override this
     * behavior, use {@link GlobalConfiguration.terminalEncoding}.
     *
     * @param actual   - the actual value
     * @param expected - the expected value
     * @returns the calculated diff
     */
    diff(actual: string, expected: string): DiffResult;
    /**
     * Write a single delta.
     *
     * @param delta  - a delta
     * @param writer - the writer to write into
     */
    private writeDelta;
    /**
     * @returns a new writer
     */
    private createDiffWriter;
    /**
     * @param line - a line
     * @returns true if `line` is empty once all colors and padding characters are removed
     */
    isEmpty(line: string): boolean;
}
export { DiffGenerator };