fix: enforce default for non-confirmation prompts

lib/cli.js

@@ -12,8 +12,15 @@ const SPINNER_STATUS = {
   WARN: 'warn',
   INFO: 'info'
 };
+
 const { SUCCESS, FAILED, WARN, INFO } = SPINNER_STATUS;
 
+const QUESTION_TYPE = {
+  INPUT: 'input',
+  NUMBER: 'number',
+  CONFIRM: 'confirm'
+};
+
 function head(text, length = 11) {
   return chalk.bold(text.padEnd(length));
 }
@@ -23,6 +30,7 @@ class CLI {
     this.stream = stream || process.stderr;
     this.spinner = ora({ stream: this.stream });
     this.SPINNER_STATUS = SPINNER_STATUS;
+    this.QUESTION_TYPE = QUESTION_TYPE;
     this.figureIndent = '   ';
     this.assumeYes = false;
   }
@@ -44,15 +52,21 @@ class CLI {
       this.separator();
     }
 
-    const questionType = opts.questionType || 'confirm';
-    const availableTypes = ['input', 'number', 'confirm'];
+    const questionType = opts.questionType || QUESTION_TYPE.CONFIRM;
+    const availableTypes = Object.values(QUESTION_TYPE);
     if (!availableTypes.includes(questionType)) {
       throw new Error(
         `${questionType} must be one of ${availableTypes.join(', ')}`);
     }
 
-    const defaultAnswer =
-      (opts.defaultAnswer !== 'undefined') ? opts.defaultAnswer : true;
+    const defaultAnswer = (opts.defaultAnswer === undefined)
+      ? true : opts.defaultAnswer;
+    if (typeof defaultAnswer === 'boolean' &&
+        questionType !== QUESTION_TYPE.CONFIRM) {
+      throw new Error(
+        'defaultAnswer must be provided for non-confirmation prompts');
+    }
+
     if (this.assumeYes) {
       return defaultAnswer;
     }
@@ -153,5 +167,6 @@ class CLI {
 };
 
 CLI.SPINNER_STATUS = SPINNER_STATUS;
+CLI.QUESTION_TYPE = QUESTION_TYPE;
 
 module.exports = CLI;

test/unit/cli.test.js

@@ -173,6 +173,36 @@ describe('cli', () => {
       cli.setAssumeYes();
     });
 
+    it('rejects when no default answer is provided for \'input\' type', () => {
+      return assert.rejects(async() => {
+        await cli.prompt('What is your favorite color', {
+          questionType: cli.QUESTION_TYPE.INPUT
+        });
+      }, /defaultAnswer must be provided for non-confirmation prompts/);
+    });
+
+    it('rejects when no default answer is provided for \'number\' type', () => {
+      return assert.rejects(async() => {
+        await cli.prompt('Pick a number from 1-10', {
+          questionType: cli.QUESTION_TYPE.NUMBER
+        });
+      }, /defaultAnswer must be provided for non-confirmation prompts/);
+    });
+
+    it('should return the default answer for an \'input\' type', async() => {
+      assert.strictEqual(await cli.prompt('What is your favorite color', {
+        defaultAnswer: 'blue',
+        questionType: cli.QUESTION_TYPE.INPUT
+      }), 'blue');
+    });
+
+    it('should return the default answer for a \'number\' type', async() => {
+      assert.strictEqual(await cli.prompt('Pick a number from 1-10', {
+        defaultAnswer: 10,
+        questionType: cli.QUESTION_TYPE.NUMBER
+      }), 10);
+    });
+
     it('should return true if no default is given', async() => {
       assert.strictEqual(await cli.prompt('Question?'), true);
     });