import { default as ts } from 'typescript';
import { JsxContext } from './types.ts';
/**
 * This runs before we know what imports will be needed.
 *
 * 1. Go though all import paths and take note of them to inform us later if
 *    some custom element import still need or need not be added
 * 2. Take note of all the existing Lit imports. Otherwise, when inserting
 *    imports, if we see that e.x "html" is not present in the "lit" import, we
 *    might import it again and fail to check that it might be imported further
 *    down from "lit-html".
 * 3. Drop compiler-only imports that exist as runtime imports only for
 *    type checking or as compiler hints.
 */
export declare function trackExistingImports(context: JsxContext, importDeclaration: ts.ImportDeclaration): ts.ImportDeclaration | undefined;
/**
 * After we know what imports will be needed, if there already are some imports
 * from the places we are looking for, augment those import declarations.
 *
 * In a step after this, if any imports will still be needed, we will add them.
 */
export declare function augmentExistingImports(this: JsxContext, node: ts.Statement): ts.Statement;
/**
 * For each remaining needed import that is not already included, add an
 * import declaration
 */
export declare function addMissingLitImports(context: JsxContext): ts.ImportDeclaration[];