feat: add required option to autocomplete multiselect

.changeset/strong-ravens-greet.md

@@ -0,0 +1,5 @@
+---
+"@clack/prompts": minor
+---
+
+Add a `required` option to autocomplete multiselect.

packages/prompts/src/autocomplete.ts

@@ -41,7 +41,7 @@ function getSelectedOptions<T>(values: T[], options: Option<T>[]): Option<T>[] {
 	return results;
 }
 
-export interface AutocompleteOptions<Value> extends CommonOptions {
+interface AutocompleteSharedOptions<Value> extends CommonOptions {
 	/**
 	 * The message to display to the user.
 	 */
@@ -50,10 +50,6 @@ export interface AutocompleteOptions<Value> extends CommonOptions {
 	 * Available options for the autocomplete prompt.
 	 */
 	options: Option<Value>[];
-	/**
-	 * The initial selected value.
-	 */
-	initialValue?: Value;
 	/**
 	 * Maximum number of items to display at once.
 	 */
@@ -64,6 +60,13 @@ export interface AutocompleteOptions<Value> extends CommonOptions {
 	placeholder?: string;
 }
 
+export interface AutocompleteOptions<Value> extends AutocompleteSharedOptions<Value> {
+	/**
+	 * The initial selected value.
+	 */
+	initialValue?: Value;
+}
+
 export const autocomplete = <Value>(opts: AutocompleteOptions<Value>) => {
 	const prompt = new AutocompletePrompt({
 		options: opts.options,
@@ -158,35 +161,15 @@ export const autocomplete = <Value>(opts: AutocompleteOptions<Value>) => {
 };
 
 // Type definition for the autocompleteMultiselect component
-export interface AutocompleteMultiSelectOptions<Value> {
-	/**
-	 * The message to display to the user
-	 */
-	message: string;
-	/**
-	 * The options for the user to choose from
-	 */
-	options: Option<Value>[];
+export interface AutocompleteMultiSelectOptions<Value> extends AutocompleteSharedOptions<Value> {
 	/**
 	 * The initial selected values
 	 */
 	initialValues?: Value[];
 	/**
-	 * The maximum number of items that can be selected
-	 */
-	maxItems?: number;
-	/**
-	 * The placeholder to display in the input
-	 */
-	placeholder?: string;
-	/**
-	 * The stream to read from
-	 */
-	input?: NodeJS.ReadStream;
-	/**
-	 * The stream to write to
+	 * If true, at least one option must be selected
 	 */
-	output?: NodeJS.WriteStream;
+	required?: boolean;
 }
 
 /**
@@ -220,6 +203,12 @@ export const autocompleteMultiselect = <Value>(opts: AutocompleteMultiSelectOpti
 		filter: (search, opt) => {
 			return getFilteredOption(search, opt);
 		},
+		validate: () => {
+			if (opts.required && prompt.selectedValues.length === 0) {
+				return 'Please select at least one item';
+			}
+			return undefined;
+		},
 		placeholder: opts.placeholder,
 		initialValue: opts.initialValues,
 		input: opts.input,
@@ -229,10 +218,6 @@ export const autocompleteMultiselect = <Value>(opts: AutocompleteMultiSelectOpti
 			const title = `${color.gray(S_BAR)}\n${symbol(this.state)}  ${opts.message}\n`;
 
 			// Selection counter
-			const counter =
-				this.selectedValues.length > 0
-					? color.cyan(` (${this.selectedValues.length} selected)`)
-					: '';
 			const value = String(this.value ?? '');
 
 			// Search input display
@@ -270,6 +255,9 @@ export const autocompleteMultiselect = <Value>(opts: AutocompleteMultiSelectOpti
 							? [`${color.cyan(S_BAR)}  ${color.yellow('No matches found')}`]
 							: [];
 
+					const errorMessage =
+						this.state === 'error' ? [`${color.cyan(S_BAR)}  ${color.yellow(this.error)}`] : [];
+
 					// Get limited options for display
 					const displayOptions = limitOptions({
 						cursor: this.cursor,
@@ -285,6 +273,7 @@ export const autocompleteMultiselect = <Value>(opts: AutocompleteMultiSelectOpti
 						title,
 						`${color.cyan(S_BAR)}  ${color.dim('Search:')} ${searchText}${matches}`,
 						...noResults,
+						...errorMessage,
 						...displayOptions.map((option) => `${color.cyan(S_BAR)}  ${option}`),
 						`${color.cyan(S_BAR)}  ${color.dim(instructions.join(' • '))}`,
 						`${color.cyan(S_BAR_END)}`,

packages/prompts/test/__snapshots__/autocomplete.test.ts.snap

@@ -15,6 +15,14 @@ exports[`autocomplete > limits displayed options when maxItems is set 1`] = `
 │  ...
 │  ↑/↓ to select • Enter: confirm • Type: to search
 └",
+  "<cursor.backward count=999><cursor.up count=11>",
+  "<cursor.down count=1>",
+  "<erase.down>",
+  "◇  Select an option
+│",
+  "
+",
+  "<cursor.show>",
 ]
 `;
 
@@ -32,6 +40,14 @@ exports[`autocomplete > renders initial UI with message and instructions 1`] = `
 │  ○ Orange
 │  ↑/↓ to select • Enter: confirm • Type: to search
 └",
+  "<cursor.backward count=999><cursor.up count=10>",
+  "<cursor.down count=1>",
+  "<erase.down>",
+  "◇  Select a fruit
+│",
+  "
+",
+  "<cursor.show>",
 ]
 `;
 
@@ -96,6 +112,14 @@ exports[`autocomplete > shows hint when option has hint and is focused 1`] = `
 │  ● Kiwi (New Zealand)
 │  ↑/↓ to select • Enter: confirm • Type: to search
 └",
+  "<cursor.backward count=999><cursor.up count=11>",
+  "<cursor.down count=1>",
+  "<erase.down>",
+  "◇  Select a fruit
+│  Kiwi",
+  "
+",
+  "<cursor.show>",
 ]
 `;
 
@@ -120,6 +144,14 @@ exports[`autocomplete > shows no matches message when search has no results 1`]
 │  No matches found
 │  ↑/↓ to select • Enter: confirm • Type: to search
 └",
+  "<cursor.backward count=999><cursor.up count=6>",
+  "<cursor.down count=1>",
+  "<erase.down>",
+  "◇  Select a fruit
+│",
+  "
+",
+  "<cursor.show>",
 ]
 `;
 
@@ -183,3 +215,55 @@ exports[`autocomplete > shows strikethrough in cancel state 1`] = `
   "<cursor.show>",
 ]
 `;
+
+exports[`autocompleteMultiselect > renders error when empty selection & required is true 1`] = `
+[
+  "<cursor.hide>",
+  "│
+◆  Select a fruit
+
+│  Search: _
+│  ◻ Apple
+│  ◻ Banana
+│  ◻ Cherry
+│  ◻ Grape
+│  ◻ Orange
+│  ↑/↓ to navigate • Space: select • Enter: confirm • Type: to search
+└",
+  "<cursor.backward count=999><cursor.up count=10>",
+  "<cursor.down count=1>",
+  "<erase.down>",
+  "▲  Select a fruit
+
+│  Search: _
+│  Please select at least one item
+│  ◻ Apple
+│  ◻ Banana
+│  ◻ Cherry
+│  ◻ Grape
+│  ◻ Orange
+│  ↑/↓ to navigate • Space: select • Enter: confirm • Type: to search
+└",
+  "<cursor.backward count=999><cursor.up count=11>",
+  "<cursor.down count=1>",
+  "<erase.down>",
+  "◆  Select a fruit
+
+│  Search: _
+│  ◼ Apple
+│  ◻ Banana
+│  ◻ Cherry
+│  ◻ Grape
+│  ◻ Orange
+│  ↑/↓ to navigate • Space: select • Enter: confirm • Type: to search
+└",
+  "<cursor.backward count=999><cursor.up count=10>",
+  "<cursor.down count=1>",
+  "<erase.down>",
+  "◇  Select a fruit
+│  1 items selected",
+  "
+",
+  "<cursor.show>",
+]
+`;

packages/prompts/test/autocomplete.test.ts

@@ -1,5 +1,5 @@
 import { afterEach, beforeEach, describe, expect, test, vi } from 'vitest';
-import { autocomplete } from '../src/autocomplete.js';
+import { autocomplete, autocompleteMultiselect } from '../src/autocomplete.js';
 import { MockReadable, MockWritable } from './test-utils.js';
 
 describe('autocomplete', () => {
@@ -30,9 +30,9 @@ describe('autocomplete', () => {
 			output,
 		});
 
-		expect(output.buffer).toMatchSnapshot();
 		input.emit('keypress', '', { name: 'return' });
 		await result;
+		expect(output.buffer).toMatchSnapshot();
 	});
 
 	test('limits displayed options when maxItems is set', async () => {
@@ -49,9 +49,9 @@ describe('autocomplete', () => {
 			output,
 		});
 
-		expect(output.buffer).toMatchSnapshot();
 		input.emit('keypress', '', { name: 'return' });
 		await result;
+		expect(output.buffer).toMatchSnapshot();
 	});
 
 	test('shows no matches message when search has no results', async () => {
@@ -64,9 +64,9 @@ describe('autocomplete', () => {
 
 		// Type something that won't match
 		input.emit('keypress', 'z', { name: 'z' });
-		expect(output.buffer).toMatchSnapshot();
 		input.emit('keypress', '', { name: 'return' });
 		await result;
+		expect(output.buffer).toMatchSnapshot();
 	});
 
 	test('shows hint when option has hint and is focused', async () => {
@@ -83,9 +83,9 @@ describe('autocomplete', () => {
 		input.emit('keypress', '', { name: 'down' });
 		input.emit('keypress', '', { name: 'down' });
 		input.emit('keypress', '', { name: 'down' });
-		expect(output.buffer).toMatchSnapshot();
 		input.emit('keypress', '', { name: 'return' });
 		await result;
+		expect(output.buffer).toMatchSnapshot();
 	});
 
 	test('shows selected value in submit state', async () => {
@@ -121,3 +121,40 @@ describe('autocomplete', () => {
 		expect(output.buffer).toMatchSnapshot();
 	});
 });
+
+describe('autocompleteMultiselect', () => {
+	let input: MockReadable;
+	let output: MockWritable;
+	const testOptions = [
+		{ value: 'apple', label: 'Apple' },
+		{ value: 'banana', label: 'Banana' },
+		{ value: 'cherry', label: 'Cherry' },
+		{ value: 'grape', label: 'Grape' },
+		{ value: 'orange', label: 'Orange' },
+	];
+
+	beforeEach(() => {
+		input = new MockReadable();
+		output = new MockWritable();
+	});
+
+	afterEach(() => {
+		vi.restoreAllMocks();
+	});
+
+	test('renders error when empty selection & required is true', async () => {
+		const result = autocompleteMultiselect({
+			message: 'Select a fruit',
+			options: testOptions,
+			required: true,
+			input,
+			output,
+		});
+
+		input.emit('keypress', '', { name: 'return' });
+		input.emit('keypress', '', { name: 'tab' });
+		input.emit('keypress', '', { name: 'return' });
+		await result;
+		expect(output.buffer).toMatchSnapshot();
+	});
+});