ES `ClassDecoratorContext.name` has incorrect value with static `name`

🔎 Search Terms

ClassDecoratorContext static name

🕗 Version & Regression Information

5.0.4-5.9.3

⏯ Playground Link

https://tsplay.dev/N7vAow

💻 Code

const decorate = (_: unknown, ctx: ClassDecoratorContext) => {
    console.log('decorate(%o)', ctx.name);
};

@decorate
class A {
    static get name() {
        return 2434;
    }
}

🙁 Actual behavior

ctx.name is 2434 (from A.name)

🙂 Expected behavior

ctx.name is 'A' (actual class name)

Additional information about the issue

The wrong value comes from the context initializer in the emitted code:

__esDecorate(
    null,
    (_classDescriptor = { value: _classThis }),
    _classDecorators,
    { kind: 'class', name: _classThis.name, metadata: _metadata },
    null,
    _classExtraInitializers,
);

The context name is initialized with _classThis.name (which triggers the getter) instead of the actual class name value (literal "A" in this case).

Possible Fix

Currently, the _classThis.name fragment comes from const classNameReference in transformClassLike in transformers/esDecorators.ts:

const classNameReference = factory.createPropertyAccessExpression(renamedClassThis, "name");

It should be adjusted to get an actual class name (either literal or computed), possibly like this:

const classNameReference = node.name ? factory.createStringLiteralFromNode(node.name) :
    node.emitNode?.assignedName ?? factory.createStringLiteral("")