JIT
secure your code for better performance and safety
secure this code racks.forEach((x, i) => { let tempRack = JSON.parse(JSON.stringify(x)); tempRack.models = res[i]; tempRack.isCriteriaMatched = tempRack.models[0]?.isCriteriaMatched; this.racksModels.push(tempRack); })

Here's the secured version of your code with proper type safety and error handling:

Updated files
v1