Support multiple `queueName` entries and fix `queueName` extraction in `serverless-offline-sqs`

[renanlido]

Description

When using the serverless-offline-sqs plugin with an array of queueName values or with ARNs, the current implementation:

• Fails to extract the queue name correctly due to a misplaced switch('string').
• Only creates a single SQS listener per function, ignoring additional names passed via --queueName or defined as an array.

This issue proposes:

1. Replacing the faulty switch with clear if/else if logic—including a guard for missing properties.
2. Expanding SQS.create() to flatten both configured and overridden queueName arrays, creating one listener per queue.

---

Serverless Configuration

custom:
  serverless-offline-sqs:
    autoCreate: true
    queueName:
      - appLogsQueue
      - ediProcessingQueue
    region: ${env:AWS_REGION, 'us-east-1'}
    endpoint: ${env:AWS_ENDPOINT, 'http://localhost:4566'}
    accessKeyId: ${env:AWS_ACCESS_KEY_ID, 'develop'}
    secretAccessKey: ${env:AWS_SECRET_ACCESS_KEY, 'develop'}
    apiVersion: 2012-11-05
    skipCacheInvalidation: false

---

Steps to Reproduce

1. Define two queues under queueName in serverless.yml as shown above.
2. Run serverless offline --queueName queueA,queueB.
3. Observe that only one listener is created, and ARNs or object definitions are not parsed correctly.

---

Proposed Changes

diff --git a/src/sqs-event-definition.js b/src/sqs-event-definition.js
index a38bb0c..849df93 100644
--- a/src/sqs-event-definition.js
+++ b/src/sqs-event-definition.js
@@ -10,23 +10,14 @@ class SQSEventDefinition {
-    switch ('string') {
-      case typeof rawSqsEventDefinition: {
-        queueName = extractQueueNameFromARN(rawSqsEventDefinition);
-        break;
-      }
-      case typeof rawSqsEventDefinition.arn: {
-        queueName = extractQueueNameFromARN(rawSqsEventDefinition.arn);
-        break;
-      }
-      case typeof rawSqsEventDefinition.queueName: {
-        queueName = rawSqsEventDefinition.queueName;
-        break;
-      }
-      // No default
+    if (typeof rawSqsEventDefinition === 'string') {
+      queueName = extractQueueNameFromARN(rawSqsEventDefinition);
+    } else if (rawSqsEventDefinition.arn) {
+      queueName = extractQueueNameFromARN(rawSqsEventDefinition.arn);
+    } else if (rawSqsEventDefinition.queueName) {
+      queueName = rawSqsEventDefinition.queueName;
+    } else {
+      throw new Error('SQSEventDefinition: missing queueName or arn');
     }
     this.enabled = isNil(enabled) ? true : enabled;

diff --git a/src/sqs.js b/src/sqs.js
index 82e8aab..7155739 100644
--- a/src/sqs.js
+++ b/src/sqs.js
@@ -37,7 +37,17 @@ class SQS {
-    return Promise.all(events.map(({functionKey, sqs}) => this._create(functionKey, sqs)));
+    // Flatten configured and overridden queueName arrays into individual tasks
+    const tasks = events.flatMap(({ functionKey, sqs }) => {
+      const originalNames = Array.isArray(sqs.queueName)
+        ? sqs.queueName
+        : [sqs.queueName];
+      const override = this.options.queueName;
+      const finalNames = override
+        ? Array.isArray(override)
+          ? override
+          : [override]
+        : originalNames;
+
+      return finalNames.map(name => ({ functionKey, sqs: { ...sqs, queueName: name } }));
+    });
+    return Promise.all(tasks.map(({ functionKey, sqs }) => this._create(functionKey, sqs)));

---

Expected Behavior

• Both appLogsQueue and ediProcessingQueue are automatically created and bound to the function.
• Overriding via CLI (--queueName) spawns one listener per provided name.
• Any missing arn or queueName throws a clear, early error.

---

Additional Context

This change restores correct parsing of ARNs, supports array-based configuration, and fully honors CLI overrides—critical for workflows that fan out to multiple queues in local development.