/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.dev/license
 */
import { NgtscProgram } from '@angular/compiler-cli';
import ts from 'typescript';
/**
 * Analyzes one or more modified files for changes to determine if any
 * class declarations for Angular components are candidates for hot
 * module replacement (HMR). If any source files are also modified but
 * are not candidates then all candidates become invalid. This invalidation
 * ensures that a full rebuild occurs and the running application stays
 * synchronized with the code.
 * @param modifiedFiles A set of modified files to analyze.
 * @param param1 An Angular compiler instance
 * @param staleSourceFiles A map of paths to previous source file instances.
 * @returns A set of HMR candidate component class declarations.
 */
export declare function collectHmrCandidates(modifiedFiles: Set<string>, { compiler }: NgtscProgram, staleSourceFiles: Map<string, ts.SourceFile> | undefined): Set<ts.ClassDeclaration>;
/**
 * Analyzes the updates of a source file for potential HMR component class candidates.
 * A source file can contain candidates if only the Angular component metadata of a class
 * has been changed and the metadata changes are only of supported fields.
 * @param stale The stale (previous) source file instance.
 * @param updated The updated source file instance.
 * @param compiler An Angular compiler instance.
 * @returns An array of candidate class declarations; or `null` if unsupported changes are present.
 */
export declare function analyzeFileUpdates(stale: ts.SourceFile, updated: ts.SourceFile, compiler: NgtscProgram['compiler']): ts.ClassDeclaration[] | null;