import { Scope, SourceCode, Rule } from 'eslint';
import * as ESTree from 'estree';

type LegacyContext = {
  getCwd: () => string;
  getFilename: () => string;
  getPhysicalFilename: () => string;
  getSourceCode: () => SourceCode;
  getScope: never;
  getAncestors: never;
  getDeclaredVariables: never;
};

type NewContext = {
  cwd: string;
  filename: string;
  sourceCode: SourceCode;
  getPhysicalFilename?: () => string;
  getScope: () => Scope.Scope;
  getAncestors: () => ESTree.Node[];
  getDeclaredVariables: (node: ESTree.Node) => Scope.Variable[];
};

export type Context = LegacyContext | NewContext | Rule.RuleContext;

declare function getAncestors(context: Context, node: ESTree.Node): ESTree.Node[];
declare function getDeclaredVariables(context: Context, node: ESTree.Node): Scope.Variable[];
declare function getFilename(context: Context): string;
declare function getPhysicalFilename(context: Context): string;
declare function getScope(context: Context, node?: ESTree.Node): Scope.Scope;
declare function getSourceCode(context: Context): SourceCode;
declare function getCWD(context: Context): string | undefined;

export {
  getAncestors,
  getCWD,
  getDeclaredVariables,
  getFilename,
  getPhysicalFilename,
  getScope,
  getSourceCode,
};