/**
 * @license
 * Copyright 2021 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
import ts from 'typescript';
import type { Visitor } from './visitor.js';
/**
 * A transformer for Lit code.
 *
 * Configured with an array of visitors, each of which handles a specific Lit
 * feature such as a decorator. All visitors are invoked from a single pass
 * through each file.
 *
 * Files are only traversed at all if there is at least one feature imported
 * from an official Lit module (e.g. the "property" decorator), and there is a
 * registered visitor that declares it will handle that feature (e.g. the
 * PropertyVisitor).
 */
export declare class LitTransformer {
    private readonly _context;
    private readonly _classDecoratorVisitors;
    private readonly _memberDecoratorVisitors;
    private readonly _genericVisitors;
    private readonly _litFileContext;
    constructor(program: ts.Program, context: ts.TransformationContext, visitors: Array<Visitor>);
    private _registerVisitor;
    private _unregisterVisitor;
    visitFile: (node: ts.Node) => ts.VisitResult<ts.Node>;
    visit: (node: ts.Node) => ts.VisitResult<ts.Node | undefined>;
    /**
     * Add an entry to our "litImports" map for each relevant imported symbol, if
     * this is an import from an official Lit package. Returns whether or not
     * anything relevant was found.
     */
    private _updateFileContextWithLitImports;
    private _visitImportDeclaration;
    private getDecorators;
    private _visitClassDeclaration;
    /**
     * Create the AST from e.g. `@property({type: String}) myProperty`:
     *
     *   static get properties() {
     *     return {
     *       myProperty: { type: String },
     *       ...
     *     }
     *   }
     */
    private _createStaticPropertiesExpression;
    private _findExistingStaticPropertiesExpression;
    /**
     * Create or modify a class constructor to add additional constructor
     * statements from any of our transforms.
     */
    private _addExtraConstructorStatements;
}