removed null assertions

Author: Benedikt Pauwels

Diff for: examples/lambda-functions/get-by-id.ts

@@ -51,20 +51,23 @@ export const getByIdHandler = async (event: APIGatewayProxyEvent, context: Conte
     awsRequestId: context.awsRequestId,
   });
 
-  // Get id from pathParameters from APIGateway because of `/{id}` at template.yaml
-  const id = event.pathParameters!.id;
-
   // Get the item from the table
   // https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB/DocumentClient.html#get-property
   let response;
   try {
     if (!tableName) {
       throw new Error('SAMPLE_TABLE environment variable is not set');
     }
+    if (!event.pathParameters) {
+      throw new Error('event does not contain pathParameters')
+    }
+    if (!event.pathParameters.id) {
+      throw new Error('PathParameter id is missing')
+    }
 
     const data = await docClient.get({
       TableName: tableName,
-      Key: { id: id },
+      Key: { id: event.pathParameters.id },
     }).promise();
     const item = data.Item;
     response = {

Diff for: examples/lambda-functions/put-item.ts

@@ -51,18 +51,21 @@ export const putItemHandler = async (event: APIGatewayProxyEvent, context: Conte
     awsRequestId: context.awsRequestId,
   });
 
-  // Get id and name from the body of the request
-  const body = JSON.parse(event.body!);
-  const id = body.id;
-  const name = body.name;
-
   // Creates a new item, or replaces an old item with a new item
   // https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB/DocumentClient.html#put-property
   let response;
   try {
     if (!tableName) {
       throw new Error('SAMPLE_TABLE environment variable is not set');
     }
+    if (!event.body) {
+      throw new Error('Event does not contain body')
+    }
+
+    // Get id and name from the body of the request
+    const body = JSON.parse(event.body);
+    const id = body.id;
+    const name = body.name;
 
     await docClient.put({
       TableName: tableName,