import * as ts from "typescript";
import { CompilerOptionsJson } from "./tsc";
export declare enum OutModules {
    Js = 0,
    Mjs = 1,
    Both = 2,
}
/**
 * Typescript options, can be applied both to the project or for specific targets.
 */
export interface TypescriptOptions {
    /**
     * Typescript instance to use for compilation.
     *
     * Merge rule: Last write win.
     */
    typescript?: typeof ts;
    /**
     * Exit with non-null return code on any error when building the scripts.
     * In watch mode, the errors are reported but the process does not stop (`strict: false`).
     *
     * Default: `true`.
     * Merge rule: Last write win.
     */
    strict?: boolean;
    /**
     * Override the default compiler options.
     * These options are passed to `gulp-typescript` and used when emiting `tsconfig.json` files.
     *
     * Merge rule: Shallow merge (`actual = {...default, ...project, ...target}`).
     */
    compilerOptions?: CompilerOptionsJson;
    /**
     * A list of paths where you should generate a `tsconfig.json` file.
     *
     * If used in a project: relative to `project.root`
     * If used in a target: relative to `project.src`.
     *
     * Merge rule: Last write win (no array merge).
     */
    tsconfigJson?: string[];
    /**
     * Output modules.
     *
     * - `Default`: Use the compiler options to emit `*.js` files.
     * - `Mjs`: Enforce `es2015` modules and emit `*.mjs` files.
     * - `Both`: Emit both `*.js` files using the compiler options and `*.mjs` using `es2015`.
     *
     * Default: `Js`
     */
    outModules?: OutModules;
}
/**
 * Typescript options, can be applied both to the project or for specific targets.
 */
export interface CompleteTypescriptOptions extends TypescriptOptions {
    /**
     * Typescript instance to use for compilation.
     *
     * Merge rule: Last write win.
     */
    typescript: typeof ts;
    /**
     * Exit with non-null return code on any error when building the scripts.
     * In watch mode, the errors are reported but the process does not stop (`strict: false`).
     *
     * Default: `true`.
     * Merge rule: Last write win.
     */
    strict?: boolean;
    /**
     * Override the default compiler options.
     * These options are passed to `gulp-typescript` and used when emiting `tsconfig.json` files.
     *
     * Merge rule: Shallow merge (`actual = {...default, ...project, ...target}`).
     */
    compilerOptions: CompilerOptionsJson;
    /**
     * A list of paths where you should generate a `tsconfig.json` file.
     *
     * If used in a project: relative to `project.root`
     * If used in a target: relative to `project.src`.
     *
     * Merge rule: Last write win (no array merge).
     */
    tsconfigJson: string[];
    /**
     * Output modules.
     *
     * - `Default`: Use the compiler options to emit `*.js` files.
     * - `Mjs`: Enforce `es2015` modules and emit `*.mjs` files.
     * - `Both`: Emit both `*.js` files using the compiler options and `*.mjs` using `es2015`.
     *
     * Merge rule: Last write win
     */
    outModules: OutModules;
}
export declare const DEFAULT_PROJECT_TS_OPTIONS: TypescriptOptions;
export declare function mergeTypescriptOptions(base: TypescriptOptions, extra?: TypescriptOptions): TypescriptOptions;