import type { Plugin } from 'esbuild';
/**
 * A simple ESBuild plugin fixing extensions for `require` and `import` calls.
 *
 * This can be useful when compiling dual-module packages (`esm` and `cjs`),
 * where the file module type is determined by the `.mjs` or `.cjs` extension.
 *
 * For example this will make sure all `import` statements use the `.mjs`
 * extensions, while all `require` use `.cjs`.
 *
 * ```
 * await find('*.ts', { directory: 'src' })
 *   .esbuild({
 *     outdir: 'dist',
 *     format: 'cjs',
 *     plugins: [ fixExtensions ],
 *     outExtension: { '.js': '.mjs' },
 *   })
 *
 * await find('*.ts', { directory: 'src' })
 *   .esbuild({
 *     outdir: 'dist',
 *     format: 'esm',
 *     plugins: [ fixExtensions ],
 *     outExtension: { '.js': '.mjs' },
 *   })
 * ```
 */
export declare function fixExtensions(): Plugin;