fix enum without type (#254)

Author: Eomm

index.js

@@ -165,7 +165,8 @@ const objectKeywords = [
   'properties',
   'patternProperties',
   'additionalProperties',
-  'dependencies'
+  'dependencies',
+  'enum'
 ]
 
 const arrayKeywords = [
@@ -1105,6 +1106,10 @@ function nested (laterCode, name, key, location, subKey, isArray) {
     var inferredType = inferTypeByKeyword(schema)
     if (inferredType) {
       schema.type = inferredType
+
+      if (inferredType === 'object' && schema.enum && !Object.hasOwnProperty.call(schema, 'additionalProperties')) {
+        schema.additionalProperties = true
+      }
     }
   }
 

test/additionalProperties.test.js

@@ -251,3 +251,36 @@ test('field passed to fastSafeStringify as undefined should be removed', (t) =>
   const obj = { ap: { value: 'string', someNumber: undefined } }
   t.equal('{"ap":{"value":"string"}}', stringify(obj))
 })
+
+test('property without type but with enum, will acts as additionalProperties', (t) => {
+  t.plan(1)
+  const stringify = build({
+    title: 'automatic additionalProperties',
+    type: 'object',
+    properties: {
+      ap: {
+        enum: ['foobar', 42, ['foo', 'bar'], {}]
+      }
+    }
+  })
+
+  const obj = { ap: { additional: 'field' } }
+  t.equal('{"ap":{"additional":"field"}}', stringify(obj))
+})
+
+test('property without type but with enum, will acts as additionalProperties without overwriting', (t) => {
+  t.plan(1)
+  const stringify = build({
+    title: 'automatic additionalProperties',
+    type: 'object',
+    properties: {
+      ap: {
+        additionalProperties: false,
+        enum: ['foobar', 42, ['foo', 'bar'], {}]
+      }
+    }
+  })
+
+  const obj = { ap: { additional: 'field' } }
+  t.equal('{"ap":{}}', stringify(obj))
+})