import * as rollup from 'rollup';
import { ResolvedConfig } from 'vite';

/**
 * Some options from `vite.config.[ts|js]`
 *
 * @since 0.2.0
 */
interface BannerPluginOptions {
    /**
     * The comment content of the banner
     *
     * @since ^0.6.0 support for `ContentCallback` types
     */
    content: string | ContentCallback;
    /**
     * The output directory from the configuration of Vite.js
     *
     * @default viteConfig.build.outDir
     * @see https://vitejs.dev/config/build-options.html#build-outdir
     */
    outDir?: string;
    /**
     * Whether to print error messages to the console
     *
     * @since 0.4.0
     * @default false
     */
    debug?: boolean;
    /**
     * By default, the validity of the content will be verified.
     *
     * If set to `false`, no verification will be performed.
     *
     * @since 0.5.0
     * @default true
     * @see https://github.com/chengpeiquan/vite-plugin-banner/issues/13
     */
    verify?: boolean;
}
/**
 * Callback function to get the contents to be injected.(or not inject)
 *
 * @since 0.6.0
 * @example
 *   ```ts
 *   content: (fileName: string) => {
 *   // Or use switch statement
 *   return fileName.endsWith('.js')
 *   ? 'This message will inject into `js` files.'
 *   : 'This message will inject into other files.'
 *   }
 *   ```
 *
 * @param fileName - The name of the file currently being processed
 * @returns
 *
 *   1. When a valid string is returned, it will become the banner content
 *   2. Returning a Falsy value will skip processing(e.g. `''`, `null`, `undefined`)
 */
type ContentCallback = (fileName: string) => string | null | undefined;
type UnionPluginOptions = string | BannerPluginOptions | ContentCallback;
/** Configuration of the plugin's internal runtime */
interface PluginConfig {
    content: string | ContentCallback;
    outDir: string;
    debug: boolean;
    verify: boolean;
}

/**
 * Add banner comments to files
 *
 * @param pluginOptions - A comment content or An option
 */
declare function export_default(pluginOptions: UnionPluginOptions): {
    name: string;
    apply: "build";
    configResolved(this: void, resolvedConfig: ResolvedConfig): void;
    writeBundle(this: rollup.PluginContext, _: rollup.NormalizedOutputOptions, bundle: rollup.OutputBundle): Promise<void>;
};

export { type BannerPluginOptions, type ContentCallback, type PluginConfig, export_default as default };