fix: Add Support for multiValueQueryStringParameters

Author: sternetj

src/adapters/helpers/lambdaEvent.ts

@@ -14,6 +14,13 @@ export const lambdaEvent = (config: AlphaOptions, relativeUrl?: string) => {
     querystringWithArraySupport,
   );
   const params = Object.assign({}, parts.query, config.params);
+  const multiValueQueryStringParameters: Record<string, any> = { ...params };
+
+  Object.keys(multiValueQueryStringParameters).forEach((key) => {
+    if (!Array.isArray(multiValueQueryStringParameters[key])) {
+      delete multiValueQueryStringParameters[key];
+    }
+  });
 
   const httpMethod = (config.method as string).toUpperCase();
   const requestTime = new Date();
@@ -64,7 +71,10 @@ export const lambdaEvent = (config: AlphaOptions, relativeUrl?: string) => {
         userArn: null,
       },
     },
-    multiValueQueryStringParameters: null,
+    multiValueQueryStringParameters:
+      Object.keys(multiValueQueryStringParameters).length > 0
+        ? multiValueQueryStringParameters
+        : null,
   };
 
   if (Buffer.isBuffer(event.body)) {

test/lambda-event.test.ts

@@ -38,6 +38,13 @@ test('Can parse URLs with duplicate parameters', () => {
       ],
       pageSize: '25',
     },
+    multiValueQueryStringParameters: {
+      _tag: [
+        'http://lifeomic.com/fhir/questionnaire-type|survey-form',
+        'http://lifeomic.com/fhir/dataset|0bb18fef-4e2d-4b91-a623-09527265a8b3',
+        'http://lifeomic.com/fhir/primary|0343bfcf-4e2d-4b91-a623-095272783bf3',
+      ],
+    },
   }));
   assertRequestId(result);
 });
@@ -55,6 +62,7 @@ test('Can parse URLs without duplicates', () => {
       pageSize: '25',
       test: 'diffValue',
     },
+    multiValueQueryStringParameters: null,
   }));
   assertRequestId(result);
 });