import { PromptTemplate } from '@langchain/core/prompts';
import { LLMProvider } from '../../../types';
import { DatabaseSchema, QueryTemplate, QueryTemplateMetadata, TemplatePlaceholder } from '../types';
import { RunnableConfig } from '../../../graphs';
type ResolvedTemplate = {
    sql: string;
    description: string;
};
export declare class TemplateHelper {
    private readonly llm;
    constructor(llm: LLMProvider);
    extractionPrompt: PromptTemplate<import("@langchain/core/prompts").ParamsFromFString<"\n<instructions>\nYou are an expert at extracting parameter values from natural language prompts.\nGiven a user prompt, a SQL template, and a list of placeholders with their descriptions and types, extract the value for each placeholder from the prompt.\nFor sql_expression placeholders, generate a valid SQL fragment that fits the position of the placeholder in the template.\n</instructions>\n<user-prompt>\n{prompt}\n</user-prompt>\n<sql-template>\n{template}\n</sql-template>\n<placeholders>\n{placeholders}\n</placeholders>\n<output-format>\nReturn each extracted value as an XML tag where the tag name is the placeholder name.\nIf a placeholder value cannot be determined from the prompt, use the default value if provided, or leave the tag empty.\n\nRules per type:\n- string: Return the raw value only, without any surrounding quotes. Example: <customer>Acme Corp</customer>\n- number: Return the numeric value only. Example: <limit>10</limit>\n- boolean: Return true or false. Example: <is_active>true</is_active>\n- sql_expression: Return a complete, valid SQL fragment with proper SQL syntax including quotes where needed. Example: <date_filter>created_at > '2024-01-01'</date_filter>\n\nDo not return any other text or explanation, just the XML tags.\n</output-format>">, any>;
    extractPlaceholderValues(placeholders: TemplatePlaceholder[], prompt: string, sqlTemplate: string, config: RunnableConfig, schema?: DatabaseSchema): Promise<Record<string, string | null>>;
    private _getColumnContext;
    private _getRelevantContextEntries;
    private _parseXmlValues;
    resolveTemplate(template: QueryTemplate, prompt: string, config: RunnableConfig, schema?: DatabaseSchema, templateFetcher?: (id: string) => Promise<QueryTemplate | undefined>, depth?: number): Promise<ResolvedTemplate>;
    private _resolveTemplateRefs;
    private _substitutePlaceholders;
    private _formatValue;
    private _isTruthy;
    private _escapeRegex;
    parseTemplateMetadata(metadata: QueryTemplateMetadata): QueryTemplate;
}
export {};