Use declared class name for ClassDecoratorContext.name

[Adrián Iglesias Álvarez (adrianiglesiass)]

Fixes #62870

Problem

For a decorated class with a declared name, the class decorator context was emitted as { kind: "class", name: _classThis.name, ... }. Reading _classThis.name invokes a user-defined static name getter or method, so context.name could be something other than the class name:

const dec = (_: unknown, ctx: ClassDecoratorContext) => console.log(ctx.name);

@dec
class A {
    static get name() { return 2434; }
}
// logs 2434, expected "A"

Implementation

In esdecorator.go, when the class has a declared (non-generated) name, the context name is now emitted as a string literal (name: "A"). Anonymous classes, including export default class {}, which get a generated identifier, keep _classThis.name. For those, __setFunctionName has already defined name as an own property, so it isn't shadowed by a static name getter.

Tests

• New compiler test esDecoratorClassContextNameShadowedByStaticMember.ts covering a static name getter, a static name() method, and an anonymous class expression.
• Existing baselines updated: every changed .js line is the kind: "class", name: ... context object (_classThis.name -> "<ClassName>"); the four sourceMap baselines change only because of the shifted columns.
• Ran the full "Before submitting a pull request" list from CONTRIBUTING.md (generate, build, test, test:all, lint, format, check:format, package builds/tests, mod tidy -diff, go work sync); all passed with no extra diff.

AI disclosure

This PR was authored with Claude Code (Anthropic). I've reviewed and understand the change and will handle the review feedback myself.

🤖 Generated with Claude Code

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[Adrián Iglesias Álvarez (adrianiglesiass)]

@microsoft-github-policy-service agree