import { JsonQLExpr } from "@mwater/jsonql";
import { CleanExprOptions } from "./ExprCleaner";
import { ValidateOptions } from "./ExprValidator";
import { PromiseExprEvaluatorContext } from "./PromiseExprEvaluator";
import Schema from "./Schema";
import { AggrStatus, EnumValue, Expr, ExtensionExpr, FieldExpr, LiteralType } from "./types";
/** Extension to the expression language. Referenced by ExtentionExprs  */
export interface ExprExtension<T extends ExtensionExpr> {
    cleanExpr(expr: T, options: CleanExprOptions, schema: Schema): Expr;
    getExprAggrStatus(expr: T, schema: Schema): AggrStatus | null;
    validateExpr(expr: T, options: ValidateOptions, schema: Schema): string | null;
    /** Return array of { id: <enum value>, name: <localized label of enum value> } */
    getExprEnumValues(expr: T, schema: Schema): EnumValue[] | null;
    /** Gets the id table of an expression of type id */
    getExprIdTable(expr: Expr, schema: Schema): string | null;
    /** Gets the type of an expression */
    getExprType(expr: Expr, schema: Schema): LiteralType | null;
    /** Summarizes expression as text */
    summarizeExpr(expr: Expr, locale: string | undefined, schema: Schema): string;
    /** Get a list of fields that are referenced in a an expression
     * Useful to know which fields and joins are used. Includes joins as fields
     */
    getReferencedFields(expr: Expr, schema: Schema): FieldExpr[];
    /** Compile to JsonQL */
    compileExpr(expr: Expr, tableAlias: string, schema: Schema): JsonQLExpr | null;
    /** Evaluate an expression given the context */
    evaluate(expr: Expr, context: PromiseExprEvaluatorContext, schema: Schema | undefined, locale: string | undefined): Promise<any>;
    /** Evaluate an expression synchronously */
    evaluateSync(expr: Expr, schema: Schema | undefined, locale: string | undefined): any;
}
/** Register an extension to expressions.
 * @param id referenced in type { type: "extension", extension: <id>, ... }
 */
export declare function registerExprExtension(id: string, extension: ExprExtension<ExtensionExpr>): void;
export declare function getExprExtension(id: string): ExprExtension<ExtensionExpr>;