update prompt code and test case

Author: jsparkdev

packages/core/src/prompts/prompt.ts

@@ -14,7 +14,6 @@ export interface PromptOptions<Self extends Prompt> {
 	render(this: Omit<Self, 'prompt'>): string | undefined;
 	placeholder?: string;
 	initialValue?: any;
-	defaultValue?: string;
 	validate?: ((value: any) => string | Error | undefined) | undefined;
 	input?: Readable;
 	output?: Writable;
@@ -195,22 +194,22 @@ export default class Prompt {
 		if (char && (char.toLowerCase() === 'y' || char.toLowerCase() === 'n')) {
 			this.emit('confirm', char.toLowerCase() === 'y');
 		}
-		if ((char === '\t' || key?.name === 'return') && this.opts.placeholder) {
+		if (char === '\t' && this.opts.placeholder) {
 			if (!this.value) {
-				if (this.opts.defaultValue) {
-					this.value = this.opts.defaultValue;
-					this.emit('value', this.value);
-				} else {
-					this.rl?.write(this.opts.placeholder);
-					this.emit('value', this.opts.placeholder);
-				}
+				this.rl?.write(this.opts.placeholder);
+				this.emit('value', this.opts.placeholder);
 			}
 		}
 		if (char) {
 			this.emit('key', char.toLowerCase());
 		}
 
 		if (key?.name === 'return') {
+			if (!this.value && this.opts.placeholder) {
+				this.rl?.write(this.opts.placeholder);
+				this.emit('value', this.opts.placeholder);
+      }
+
 			if (this.opts.validate) {
 				const problem = this.opts.validate(this.value);
 				if (problem) {

packages/prompts/src/index.test.ts

@@ -210,11 +210,11 @@ describe.each(['true', 'false'])('prompts (isCI = %s)', (isCI) => {
 
 			input.emit('keypress', '', { name: 'return' });
 
-			await result;
+			const value = await result;
 
 			expect(output.buffer).toMatchSnapshot();
 			// TODO (43081j): uncomment this when #263 is fixed
-			// expect(value).toBe('bar');
+			expect(value).toBe('bar');
 		});
 
 		test('<tab> applies placeholder', async () => {