Angular Property is used before its initialization error

This is now showing up with latest Typescript I will explain why

Issue here was raised: https://github.com/microsoft/TypeScript/issues/53286

That for ES2022

class Foo { 
  bar = this.buz;
  constructor(private buz: unknown) {}
}

Should error

TS2729: Property 'buz' is used before its initialization.

As well.

This was merged into the latest version of Typescript. If you are coming across this error now that would be why

—
You can see others complaining here: https://github.com/microsoft/TypeScript/issues/48814

Solution is to set
useDefineForClassFields to false i.e.

useDefineForClassFields: false

Within your tsconfig, now that is by default set to true