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Abstract classes will still import the value for a computed property at runtime #33525
Description
TypeScript Version: 3.7.0-dev.20190920
abstract class import computed property
abstract class computed property imports for runtime
Code
sharedSymbol.ts
export const sharedSymbol: unique symbol = Symbol();AbstractClass.ts
import { sharedSymbol } from "./sharedSymbol";
abstract class AbstractClass {
public abstract [sharedSymbol]: string;
}Expected behavior:
sharedSymbol.js is not imported by AbstractClass.js
Actual behavior:
The symbol is imported by AbstractClass.js despite it's use being omitted due to it's abstract nature
Playground Link: Unavailable due to the bug being related to imported values.
Related Issues: No, I did not find any
Activity
Jack-Works commentedon Mar 24, 2020
Have a try with new
import typesyntax 🤔puppy0cam commentedon Aug 21, 2020
This works properly.
puppy0cam commentedon Oct 24, 2025
In Typescript 5.9.3 this issue still exists but can be worked around by using
import type {}syntax instead ofimport {}syntax.I've attached a copy of my reproduction of this bug since playground still doesn't appear to have multi-file support (or if it does I can't find it).
typescript-bug-33525-2025-10-24.zipEdit: see my followup comment.
puppy0cam commentedon Oct 25, 2025
In the test case I uploaded to my above comment, I accidentally had
verbatimModuleSyntaxset to true.The bug still exists even when I disable that.
Here's the new reproduction:
typescript-bug-33525-2025-10-25.zip
fix: abstract properties are now properly elided from imports
fix: abstract properties are now properly elided from imports