in lib/template/pattern/lambda-pattern.ts [108:120]
private loadLayers(lambdaName: string, layerArns: string[]): any[] {
let layers = [];
if (layerArns != undefined && layerArns.length > 0) {
let index = 0;
for (let arn of layerArns) {
index++;
layers.push(lambda.LayerVersion.fromLayerVersionArn(this, `${lambdaName}-${index}-layer`, arn))
}
}
return layers;
}