I got errors when building but these all seems to be just warnings. Is this intentional?
by user 334342083445784576
Yes - I mean you can configure your tsconfig to ignore those but I would recommend you check what the error says (these are typescript compiler errors, they may or may not be bad - depends on your project)
yes, all these variables are set through serialisation from the unity site. So setting them null or undefinied in the script seemed okay for me.
by user 334342083445784576
If you are sure those are OK you can always add @ts-ignore above typescript errors like these in your scripts.
Or in the case of “no initializer” its something like
myVariable : Object3D;
and the error says you should write one of these:
myVariable?:Object3D; // its undefined by default
myVarialbe!:Object3D; // suppress that its not initialized telling the compiler this is always assigned;
myVariable:Object3D|null = null;
and never used can be fixed by starting the variable with an underscore for example 
e.g. function test(_myString:string) { ....
Changed the channel name: Typescript compiler errors in my scripts when building - how to fix (TSC)
hmm, //@ts-ignore works but not very nice code style I guess.
Setting the variables to undefined or null does not help when I want to assign them, e.g.
this.cameraAnchor?.setRotationFromEuler(this.myvariable.rotation);
by user 334342083445784576
cameraAnchor: Object3D = new Object3D() does not work, already tried it.
by user 334342083445784576
what do you mean by “when i want to assign them” ?
if you know the variable is not null then you can write myVariable! : Object3D
otherwise you need to check in your code below that the variable is not undefined. E.g.
if(this.myVariable)
this.cameraAnchor?.setRotationFromEuler(this.myvariable.rotation);
or
if(!this.myVariable) return;
this.cameraAnchor?.setRotationFromEuler(this.myvariable.rotation);
or
if(this.myVariable === undefined) return;
this.cameraAnchor?.setRotationFromEuler(this.myvariable.rotation);
oh man, okay you’re right. I feel like an amateur 
by user 334342083445784576
All good been there
last question, when I’m using import { Object3D } from "three";
in the script, the compiler also fails with
Error: ‘default’ is not exported by …/…/Library/PackageCache/com.needle.engine@2.59.2-pre/package~/node_modules/three/build/three.module.js, imported by src/scripts/NeedleCameraControl.ts
by user 334342083445784576
Removing the line, hitting the play button works, but production build fails.
by user 334342083445784576
Does it give you a line? Are you using default export ?
the import should be fine
Havent seen this error before - can you share your script ?