import { BooleanLiteralExpr, CallExpr, CaseExpr, Expr, ExprVisitor, HasAttributeExpr, InterpolateExpr, LookupExpr, MatchExpr, NullLiteralExpr, NumberLiteralExpr, ObjectLiteralExpr, StepExpr, StringLiteralExpr, VarExpr } from "./Expr";
/**
 * [[ExprPool]] maintains a set of unique interned {@link Expr} objects.
 *
 * @hidden
 */
export declare class ExprPool implements ExprVisitor<Expr, void> {
    private readonly m_booleanLiterals;
    private readonly m_numberLiterals;
    private readonly m_stringLiterals;
    private readonly m_objectLiterals;
    private readonly m_arrayLiterals;
    private readonly m_varExprs;
    private readonly m_hasAttributeExprs;
    private readonly m_matchExprs;
    private readonly m_caseExprs;
    private readonly m_interpolateExprs;
    private readonly m_stepExprs;
    private readonly m_callExprs;
    /**
     * Add `expr` to this [[ExprPool]] and return a unique {@link Expr}
     * object that is structurally equivalent to `expr`.
     *
     * @param expr - The {@link Expr} to add to this [[ExprPool]].
     * @returns A unique {@link Expr} that is structurally equivalent to `expr`.
     */
    add(expr: Expr): Expr;
    visitNullLiteralExpr(expr: NullLiteralExpr, context: void): Expr;
    visitBooleanLiteralExpr(expr: BooleanLiteralExpr, context: void): Expr;
    visitNumberLiteralExpr(expr: NumberLiteralExpr, context: void): Expr;
    visitStringLiteralExpr(expr: StringLiteralExpr, context: void): Expr;
    visitObjectLiteralExpr(expr: ObjectLiteralExpr, context: void): Expr;
    visitVarExpr(expr: VarExpr, context: void): Expr;
    visitHasAttributeExpr(expr: HasAttributeExpr, context: void): Expr;
    visitMatchExpr(expr: MatchExpr, context: void): Expr;
    visitCaseExpr(expr: CaseExpr, context: void): Expr;
    private visitCallExprImpl;
    visitCallExpr(expr: CallExpr, context: void): Expr;
    visitLookupExpr(expr: LookupExpr, context: void): Expr;
    visitStepExpr(expr: StepExpr, context: void): Expr;
    visitInterpolateExpr(expr: InterpolateExpr, context: void): Expr;
}
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