How to use the @aws-cdk/aws-lambda.AssetCode function in @aws-cdk/aws-lambda

destinationBucket: bucket,
    destinationKeyPrefix: "_next/static"
  });
  new s3Upload.BucketDeployment(stack, `${id}-s3-public-files`, {
    sources: [s3Upload.Source.asset("./public")],
    destinationBucket: bucket,
    destinationKeyPrefix: "public"
  });
  new s3Upload.BucketDeployment(stack, `${id}-s3-static-files`, {
    sources: [s3Upload.Source.asset("./static")],
    destinationBucket: bucket,
    destinationKeyPrefix: "static"
  });

  const ssrLambda = new lambda.Function(stack, `${id}-ssr-lambda`, {
    code: new lambda.AssetCode(`./${LAMBDA_BUILD_DIR}`),
    handler: "index.handler",
    runtime: lambda.Runtime.NODEJS_8_10,
    environment: {}
  });

  // const cloudFrontOrigins = [
  //   {
  //     url: bucket.bucketWebsiteUrl,
  //     private: true,
  //     pathPatterns: {
  //       "_next/*": {
  //         ttl: 86400
  //       },
  //       "static/*": {
  //         ttl: 86400
  //       }

const tableName = 'twitchViewers';
        const primaryKeyName = 'viewerId';
        const table = new aws_dynamodb_1.Table(this, 'viewers-table', {
            tableName: tableName,
            partitionKey: {
                name: primaryKeyName,
                type: aws_dynamodb_1.AttributeType.String
            },
            billingMode: aws_dynamodb_1.BillingMode.PayPerRequest
        });
        const api = new aws_sam_1.CfnApi(this, 'viewersApi', {
            stageName: 'prod',
            cors: '"*"'
        });
        new aws_sam_1.CfnFunction(this, 'SaveToDynamoDB', {
            codeUri: new aws_lambda_1.AssetCode('src').path,
            handler: 'index.handler',
            runtime: 'nodejs8.10',
            environment: {
                variables: {
                    TABLE_NAME: table.tableName,
                    PRIMARY_KEY: primaryKeyName
                }
            },
            policies: `
        - DynamoDBCrudPolicy:
            TableName: ${tableName}`,
            events: {
                save: {
                    type: 'Api',
                    properties: {
                        path: '/viewers',

const table = new Table(this, 'viewers-table', {
      tableName: tableName,
      partitionKey: {
        name: primaryKeyName,
        type: AttributeType.String
      },
      billingMode: BillingMode.PayPerRequest
    });

    const api = new CfnApi(this, 'viewersApi', {
      stageName: 'prod',
      cors: '"*"'
    });

    new CfnFunction(this, 'SaveToDynamoDB', {
      codeUri: new AssetCode('src').path,
      handler: 'index.handler',
      runtime: 'nodejs8.10',
      environment: {
        variables: {
          TABLE_NAME: table.tableName,
          PRIMARY_KEY: primaryKeyName
        }
      },
      policies: `
        - DynamoDBCrudPolicy:
            TableName: ${tableName}`,
      events: {
        save: {
          type: 'Api',
          properties: {
            path: '/viewers',