Fix various errors

src/commands/styles.ts

@@ -3,7 +3,7 @@ import { Argv } from 'yargs';
 // yargs exports
 export const command = 'styles <subcommand>';
 export const describe = 'Run subcommands to work with a custom CSS theme';
-export const builder = (yargs: Argv) => {
+export const builder = (yargs: Argv): unknown => {
 	/* eslint-disable @typescript-eslint/no-var-requires */
 	return yargs
 		.command(require('./styles/create'))
@@ -18,4 +18,4 @@ export const builder = (yargs: Argv) => {
 export const handler = noop;
 
 // internals
-function noop() {}
+function noop(): void {}

src/commands/styles/scaffold.ts

@@ -57,7 +57,7 @@ export async function scaffold(workspacePath: string, force = false): Promise<vo
 
 	debug(`copying preview file`);
 
-	await cpy('preview/', buildPath(`${workspacePath}/<preview>`, dirs), {
+	await cpy('preview', buildPath(`${workspacePath}/<preview>`, dirs), {
 		cwd: buildPath(`<dirname>/../../`, dirs),
 	});
 

src/lib/cleanDirectories.ts

@@ -22,8 +22,6 @@ const cleanDirectories = async (target: string, dest: string, tests: string, typ
 			rimraf(`${target}/tests/unit/widgets/WidgetName/`, async () => {
 				await del([`${target}/src/widgets/WidgetName.tsx`]);
 				rimraf(`${target}/src/widgets/WidgetName/`, async () => {
-					await copy(`${target}/src/`, dest + '/');
-					await copy(`${target}/tests/`, tests + '/');
 					rimraf(`${target}/**`, resolve);
 				});
 			});