Add initial typings for resin-cli-form

Change-type: patch
Signed-off-by: Thodoris Greasidis <thodoris@balena.io>

lib/utils/patterns.ts

@@ -141,7 +141,7 @@ export function confirm(
 			return true;
 		}
 
-		return getForm().ask({
+		return getForm().ask<boolean>({
 			message,
 			type: 'confirm',
 			default: false,
@@ -185,7 +185,8 @@ export function selectOrCreateApplication() {
 		.hasAny()
 		.then(hasAnyApplications => {
 			if (!hasAnyApplications) {
-				return;
+				// Just to make TS happy
+				return Promise.resolve(undefined);
 			}
 
 			return balena.models.application.getAll().then(applications => {
@@ -286,7 +287,7 @@ export function selectFromList<T>(
 	message: string,
 	choices: Array<T & { name: string }>,
 ): Bluebird<T> {
-	return getForm().ask({
+	return getForm().ask<T>({
 		message,
 		type: 'list',
 		choices: _.map(choices, s => ({

lib/utils/promote.ts

@@ -376,7 +376,7 @@ async function generateApplicationConfig(
 	const opts =
 		manifest.options && manifest.options.filter(opt => opt.name !== 'network');
 	const values = {
-		...(await form.run(opts)),
+		...(opts ? await form.run(opts) : {}),
 		...options,
 	};
 

typings/resin-cli-form/index.d.ts

@@ -15,4 +15,41 @@
  * limitations under the License.
  */
 
-declare module 'resin-cli-form';
+declare module 'resin-cli-form' {
+	import Bluebird = require('bluebird');
+
+	type TypeOrPromiseLike<T> = T | PromiseLike<T>;
+
+	type Validate = (
+		input: any,
+	) => TypeOrPromiseLike<boolean | string | undefined>;
+
+	interface AskOptions {
+		message: string;
+		type?: string;
+		name?: string;
+		default?: T;
+		choices?: Array<{
+			name: string;
+			value: T;
+		}>;
+		validate?: Validate;
+	}
+
+	interface RunQuestion {
+		message: string;
+		name: string;
+		type?: string;
+		validate?: Validate;
+	}
+
+	const form: {
+		ask: <T = string>(options: AskOptions) => Bluebird<T>;
+		run: <T = any>(
+			questions: RunQuestion[],
+			extraOptions?: { override: object },
+		) => Bluebird<T>;
+	};
+
+	export = form;
+}