When initially compiling Angular 5, an error (TS2339) may occur, but after a successful compilation, everything runs smoothly

In a unique scenario, I wrote code that fetches information from an API server without knowing the structure of the response fields. Once I receive the response, I need to create a form for updating the data and sending it back. To handle unknown ngModel properties, I dynamically generate fields after receiving the response and assign them to ngModel in a loop within my template.

However, after stopping and restarting my Angular 5 app using 'ng serve -o', I encounter a compile error on the first startup. Interestingly, if I comment out the problematic code, compile successfully, and then uncomment it, everything works as intended.

order.component.ts

// Code snippet not provided

order.component.html

// Code snippet not provided

order.service.ts

// Code snippet not provided

order.model.ts

// Code snippet not provided

My issue arises when creating new fields dynamically after receiving API response. The errors TS2339 indicate missing properties like 'className', 'label', and 'value'. How do I resolve this? Should I disable the compiler checking or refactor my code?

Answer №1

Your issue lies here:

editOrder() {
  /* ... */
  this.orderContent.push({
    className: this[newClassFieldName].className,
    label: this[newClassFieldName].label,
    value: this[newClassFieldName].value
  });
}

To be more specific:

this[newClassFieldName].className

By attempting to access a variable in your OrderComponent, you encounter an error.

The process could have succeeded if you had just declared the variable prior. However, you've nested variables within which have peculiar names. The error message is quite evident:

Property 'className' does not exist on type 'this[keyof this]'

You define the variable like so:

let newClassFieldName: string = this.orderService.order.orderContent[item].className;

Right before that, can you please add this line?

console.log(this.orderService.order.orderContent[item].className);

Then report back with the output.

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