/**
 * Copyright (c) 2020-present, Goldman Sachs
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import type { Type } from '../packageableElements/domain/Type.js';
import type { VariableExpression } from './VariableExpression.js';
import { InstanceValue } from './InstanceValue.js';
import type { ValueSpecification, ValueSpecificationVisitor } from './ValueSpecification.js';
import { Multiplicity } from '../packageableElements/domain/Multiplicity.js';
import { type Hashable } from '@finos/legend-shared';
import type { PackageableElementReference } from '../packageableElements/PackageableElementReference.js';
export declare class FunctionType implements Hashable {
    /**
     * Currently, we don't do type-inferencing
     *
     * @discrepancy model
     */
    returnType?: PackageableElementReference<Type> | undefined;
    parameters: VariableExpression[];
    returnMultiplicity: Multiplicity;
    constructor(returnType: PackageableElementReference<Type> | undefined, returnMultiplicity: Multiplicity);
    get hashCode(): string;
}
export declare class LambdaFunction implements Hashable {
    functionType: FunctionType;
    /**
     * Engine saves `openVariables` as strings. We save them as a map of var name to the VariableExpression
     * This is so we don't needless recreate VariableExpressions again and can leverage the same VariableExpression as
     * the ones used in LambdaFunction expressions. This is especially useful when handling `let` statements.
     *
     * @discrepancy model
     */
    openVariables: Map<string, VariableExpression>;
    expressionSequence: ValueSpecification[];
    constructor(type: FunctionType);
    get hashCode(): string;
}
export declare class LambdaFunctionInstanceValue extends InstanceValue implements Hashable {
    values: LambdaFunction[];
    constructor();
    get hashCode(): string;
    accept_ValueSpecificationVisitor<T>(visitor: ValueSpecificationVisitor<T>): T;
}
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