import eslint = require("eslint");

// eslint.CLIEngine.getErrorResults without modification
// eslint.CLIEngine.getFormatter without modification
// eslint.CLIEngine.outputFixes redeclared to match input shape

/**
 * Can be used to filter out all the non error messages from the report object.
 */
export const getErrorResults: typeof eslint.ESLint.getErrorResults;
/**
 * Returns the formatter representing the given format
 * or null if no formatter with the given name can be found.
 * see {@link https://github.com/eslint/eslint/blob/master/docs/developer-guide/nodejs-api.md#clienginegetformatter}
 */
export function getFormatter(
    format?: string,
): (results: eslint.ESLint.LintResult[], data?: eslint.ESLint.LintResultData) => string;
/**
 * Used to output fixes from report to disk.
 * It does by looking for files that have an output property in their results
 */
export function outputFixes(report: ResultReport): void;

export function getConfig(
    options: CLIEngineOptions & { filePath: string },
): ReturnType<eslint.ESLint["calculateConfigForFile"]>;
export function lintText(text: string, options?: Options): ResultReport;
export function lintFiles(patterns: string | string[], options?: Options): ResultReport | Promise<ResultReport>;

export type CLIEngineOptions = Pick<eslint.ESLint.Options, "baseConfig" | "cwd" | "extensions" | "fix" | "ignore"> & {
    envs?: string[] | undefined;
    globals?: string[] | undefined;
    parser?: string | undefined;
    plugins?: string[];
    rules?: { [name: string]: eslint.Linter.RuleLevel | eslint.Linter.RuleLevelAndOptions } | undefined;
};
export type ESLintOptions = Pick<eslint.Linter.LintOptions, "filename">;
export type ESLintConfig = Pick<eslint.Linter.Config, "extends" | "settings">;

export type Options =
    & {
        /** Some paths are ignored by default, including paths in .gitignore and .eslintignore. Additional ignores can be added here */
        ignores?: string[] | undefined;
        /** Enable rules specific to the Node.js versions within the configured range */
        nodeVersion?: string | boolean | undefined;
        /** Format code with Prettier */
        prettier?: boolean | undefined;
        /**
         *  Print the ESLint configuration for the given file
         */
        printConfig?: string | undefined;
        /** Set it to false to enforce no-semicolon style. */
        semicolon?: boolean | undefined;
        /** Set it to true to get 2-space indentation or specify the number of spaces. */
        space?: boolean | number | undefined;
        /**
         * Use {@link https://github.com/benmosher/eslint-plugin-import/tree/master/resolvers/webpack}
         * to resolve import search paths. This is enabled automatically if a `webpack.config.js` file is found.
         * Set this to a boolean to explicitly enable or disable the resolver.
         * @default false
         */
        webpack?: boolean | object | undefined;
    }
    & CLIEngineOptions
    & ESLintConfig
    & ESLintOptions;

export interface ResultReport {
    readonly errorCount: number;
    readonly warningCount: number;
    readonly results: eslint.ESLint.LintResult[];
}