import type estree from 'estree';
import ts from 'typescript';
import type { RequiredParserServices } from './parser-services.js';
export declare function isFunctionLikeDeclaration(declaration: ts.Declaration): declaration is ts.FunctionLikeDeclarationBase;
/**
 * Resolves a call expression to the function-like declaration it targets, using the TypeScript
 * type checker's `getResolvedSignature`. Returns `undefined` when the callee does not resolve to
 * a known function declaration (e.g. built-ins, overloads with no single declaration, or
 * cross-package symbols without source).
 *
 * Only one hop is followed: the directly called function. Deeper call chains are not resolved.
 */
export declare function followCallToDeclaration(call: estree.CallExpression, services: RequiredParserServices): ts.SignatureDeclaration | undefined;
/**
 * Resolves an identifier reference to the directly referenced function-like declaration.
 *
 * Only one indirection is followed: a direct function declaration or a variable whose initializer
 * is a function expression / arrow function. Aliases such as `const cb = setup; describe(..., cb)`
 * intentionally return `undefined`.
 */
export declare function followReferenceToDeclaration(node: estree.Identifier, services: RequiredParserServices): ts.SignatureDeclaration | undefined;
/**
 * Resolves a call expression to executable code when possible. TypeScript may resolve a typed
 * function value call to its call signature rather than to the assigned implementation. In that
 * case, fallback to the callee's value declaration for direct identifiers and object members.
 */
export declare function followCallToImplementation(call: estree.CallExpression, services: RequiredParserServices): ts.SignatureDeclaration | undefined;
/**
 * Resolves a TypeScript call expression to executable code without requiring an ESTree mapping.
 * This is used while recursively visiting declarations from other files, where
 * `tsNodeToESTreeNodeMap` only covers the originally parsed file.
 */
export declare function followTypeScriptCallToImplementation(call: ts.CallExpression, checker: ts.TypeChecker): ts.SignatureDeclaration | undefined;