large prompt follows cli ux required interface

ironfish-cli/src/commands/wallet/import.ts

@@ -150,16 +150,8 @@ export class ImportCommand extends IronfishCommand {
   }
 
   async importTTY(): Promise<string> {
-    let userInput = (
-      await largePrompt('Paste the output of wallet:export, or your spending key: ')
-    ).trim()
-
-    while (userInput.length === 0) {
-      userInput = (
-        await largePrompt('Paste the output of wallet:export, or your spending key: ')
-      ).trim()
-    }
-
-    return userInput
+    return await largePrompt('Paste the output of wallet:export, or your spending key: ', {
+      required: true,
+    })
   }
 }

ironfish-cli/src/utils/longPrompt.ts

@@ -4,7 +4,7 @@
 import readline from 'readline'
 
 // Most effective way to take in a large textual prompt input without affecting UX
-export function largePrompt(question: string): Promise<string> {
+function fetchResponse(question: string): Promise<string> {
   const rl = readline.createInterface({
     input: process.stdin,
     output: process.stdout,
@@ -17,3 +17,18 @@ export function largePrompt(question: string): Promise<string> {
     })
   })
 }
+
+export async function largePrompt(
+  question: string,
+  options?: {
+    required?: boolean
+  },
+): Promise<string> {
+  let userInput = (await fetchResponse(question)).trim()
+
+  while (userInput.length === 0 && options?.required) {
+    userInput = (await fetchResponse(question)).trim()
+  }
+
+  return userInput
+}