/**
 * ansi — generates escape sequences (CSI/SGR) and defines the colour vocabulary.
 * The lowest level that "knows" the terminal protocol. No I/O.
 */
/** The colour depth the terminal supports (see TerminalCapabilities). */
export type ColorLevel = 'truecolor' | 'ansi256' | 'ansi16' | 'none';
/** A concrete colour already resolved for a depth — ready to become SGR bytes. */
export type AnsiColor = {
    readonly kind: 'rgb';
    readonly r: number;
    readonly g: number;
    readonly b: number;
} | {
    readonly kind: 'ansi256';
    readonly index: number;
} | {
    readonly kind: 'ansi16';
    readonly index: number;
} | {
    readonly kind: 'default';
};
/**
 * Text attributes as a bitmask (comparable by value, cheap to diff).
 * A const object, not a `const enum`, to stay compatible with `isolatedModules`.
 */
export declare const Attr: {
    readonly None: 0;
    readonly Bold: number;
    readonly Dim: number;
    readonly Italic: number;
    readonly Underline: number;
    readonly Inverse: number;
    readonly Strike: number;
    readonly Blink: number;
};
/** An attribute bitmask value (combinable with bitwise OR). */
export type Attr = number;
export declare const ESC = "\u001B";
/** Builds a CSI sequence (`ESC [ … `). e.g. csi("2J"), csi(`${y};${x}H`). */
export declare function csi(body: string): string;
/**
 * Incremental SGR builder that emits ONLY the delta against the current state —
 * the key to minimizing bytes in the encoder (ARCHITECTURE §17).
 */
export interface SgrBuilder {
    transition(fg: AnsiColor, bg: AnsiColor, attrs: Attr): string;
    reset(): string;
    clear(): void;
}
export declare function createSgrBuilder(): SgrBuilder;
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