fix(includers/openapi): add default type string to enum

Author: Evgenii Fedoseev

src/services/includers/batteries/openapi/generators/traverse.ts

@@ -20,7 +20,7 @@ export function tableFromSchema(allRefs: Refs, schema: JSONSchema6): {content: s
         const description = prepareComplexDescription('', schema);
         const content = table([
             ['Type', 'Description'],
-            [schema.type, description],
+            [inferType(schema), description],
         ]);
         return {content, tableRefs: []};
     }
@@ -64,7 +64,7 @@ export function prepareTableRowData(allRefs: Refs, value: JSONSchema6, key?: str
     if (ref) {
         return {type: anchor(ref), description, ref};
     }
-    if (value.type === 'array') {
+    if (inferType(value) === 'array') {
         if (!value.items || value.items === true || Array.isArray(value.items)) {
             throw Error(`unsupported array items for ${key}`);
         }
@@ -76,7 +76,7 @@ export function prepareTableRowData(allRefs: Refs, value: JSONSchema6, key?: str
             ref: inner.ref,
         };
     }
-    return {type: `${value.type}`, description: prepareComplexDescription(description, value)};
+    return {type: `${inferType(value)}`, description: prepareComplexDescription(description, value)};
 }
 
 function prepareComplexDescription(baseDescription: string, value: JSONSchema6): string {
@@ -108,7 +108,7 @@ function findRef(allRefs: Refs, value: JSONSchema6): string | undefined {
     }
     return undefined;
 }
-type OpenJSONSchema = JSONSchema6 & {example?: any};
+type OpenJSONSchema = Omit<JSONSchema6, 'enum'> & {example?: any; enum?: Array<any>};
 type OpenJSONSchemaDefinition = OpenJSONSchema | boolean;
 
 // sample key-value JSON body
@@ -144,7 +144,7 @@ function prepareSampleElement(key: string, v: OpenJSONSchemaDefinition, required
         return undefined;
     }
     const downCallstack = callstack.concat(value);
-    switch (value.type) {
+    switch (inferType(value)) {
         case 'object':
             return prepareSampleObject(value, downCallstack);
         case 'array':
@@ -234,3 +234,18 @@ function merge(value: OpenJSONSchemaDefinition): OpenJSONSchema {
 function isRequired(key: string, value: JSONSchema6): boolean {
     return value.required?.includes(key) ?? false;
 }
+
+function inferType(value: OpenJSONSchema): JSONSchema6['type'] {
+    if (value.type) {
+        return value.type;
+    }
+    if (value.enum && Array.isArray(value.enum)) {
+        const enumType = typeof value.enum[0];
+        if (enumType === 'bigint' || enumType === 'symbol' || enumType === 'undefined' || enumType === 'function') {
+            throw new Error('Not supported type enum');
+        } else {
+            return enumType;
+        }
+    }
+    return value.type;
+}