feat(cli): improve interactive prompt UI with @clack/prompts

.projenrc.ts

@@ -1185,7 +1185,6 @@ const cli = configureProject(
       '@types/fs-extra@^11',
       '@types/mockery',
       '@types/picomatch',
-      '@types/promptly',
       '@types/semver',
       '@types/sinon',
       '@types/yargs@^15',
@@ -1243,13 +1242,12 @@ const cli = configureProject(
       'chalk@^4',
       'chokidar@^4',
       'decamelize@^5', // Non-ESM
-      'enquirer',
+      '@clack/core',
       'fs-extra@^11',
       'fast-glob',
       'picomatch',
       'p-limit@^3',
       'p-queue@^6',
-      'promptly',
       'proxy-agent',
       'semver',
       'strip-ansi@^6',
@@ -1286,6 +1284,11 @@ const cli = configureProject(
     },
     jestOptions: jestOptionsForProject({
       jestConfig: {
+        // @clack/core is ESM-only and cannot be loaded by Jest in CJS mode.
+        // Map it to a manual mock that provides safe defaults for all tests.
+        moduleNameMapper: {
+          '^@clack/core$': '<rootDir>/test/_helpers/mock-clack-core.js',
+        },
         coverageThreshold: {
           // We want to improve our test coverage
           // DO NOT LOWER THESE VALUES!

packages/@aws-cdk-testing/cli-integ/lib/shell.ts

@@ -1,6 +1,5 @@
 import type * as child_process from 'child_process';
 import * as fs from 'fs';
-import * as os from 'os';
 import * as path from 'path';
 import type { TestContext } from './integ-test';
 import { Process } from './process';
@@ -69,7 +68,10 @@ export async function shell(command: string[], options: ShellOptions = {}): Prom
           // now write the input with a slight delay to ensure
           // the child process has already started reading.
           const sendInput = () => {
-            child.writeStdin(interaction.input + (interaction.end ?? os.EOL));
+            // Use \r (carriage return) as default line ending — this is what real terminals
+            // send when Enter is pressed. Some prompt libraries (e.g. @clack/core) only
+            // recognize \r as the submit key, not \n.
+            child.writeStdin(interaction.input + (interaction.end ?? '\r'));
           };
 
           if (interaction.beforeInput) {
@@ -340,7 +342,11 @@ class LastLine {
   private lastLine: string = '';
 
   public append(chunk: string): void {
-    const lines = chunk.split(os.EOL);
+    // Strip ANSI escape codes so prompt matching works regardless of terminal styling
+    const clean = chunk.replace(/\x1b\[[0-?]*[ -/]*[@-~]/g, '');
+    // Split on \r, \n, or \r\n — interactive prompt libraries like @clack/prompts
+    // use \r and cursor movement instead of plain \n for re-rendering
+    const lines = clean.split(/\r?\n|\r/);
     if (lines.length === 1) {
       // chunk doesn't contain a new line so just append
       this.lastLine += lines[0];