import { PromptStrategy } from "./base.js";
import { ModelFamily, PromptRequest, GeneratedPrompt } from "../types.js";
/**
 * Prompt strategy for SD 1.5 models
 *
 * Key characteristics:
 * - Tag-based, comma-separated
 * - Quality tags important
 * - Extensive negative prompts REQUIRED
 * - More forgiving of prompt structure
 */
export declare class SD15Strategy extends PromptStrategy {
    readonly family: ModelFamily;
    readonly name = "SD 1.5";
    private readonly QUALITY_TAGS;
    private readonly NEGATIVE_PROMPT;
    generate(request: PromptRequest): GeneratedPrompt;
    protected applyEmphasis(keyword: string, strength?: number): string;
    /**
     * Get SD 1.5 appropriate dimensions (512 base)
     */
    private getSD15Dimensions;
    /**
     * Convert natural language to tag format
     */
    private descriptionToTags;
    private buildExplanation;
    private generateVariations;
}