export interface EmitterOptions {
    /**
     * Indentation unit (string repeated per nesting level). Defaults to two spaces.
     * Common values: `"  "` (2 spaces, Kotlin convention), `"    "` (4 spaces, Swift).
     */
    indentUnit?: string;
}
/**
 * Indent-aware string builder for code emission. Tracks nesting depth via
 * `block()` and emits a single line at the current depth via `line()`.
 *
 * Designed so that all current Kotlin/Swift output can be reproduced without
 * any hardcoded pad strings inside the emit logic.
 */
export declare class Emitter {
    private readonly indentUnit;
    private currentIndent;
    private readonly lines;
    constructor(opts?: EmitterOptions);
    /** Emit a line at the current indent. Empty string emits a blank line with no indent. */
    line(s?: string): this;
    /** Emit a blank line (no indent). */
    blank(): this;
    /**
     * Emit `header + " {"`, then run `body` at one deeper indent, then emit `footer`.
     * Footer defaults to `"}"`.
     */
    block(header: string, body: () => void, footer?: string): this;
    /**
     * Emit pre-formatted multi-line content at current indent. Each non-empty
     * source line is prefixed with the current indent; empty source lines stay empty.
     */
    raw(s: string): this;
    toString(): string;
}