Decorator metadata is undefined

[millsp]

Describe the bug

When using unions, or literal types, no decorator metadata is emitted.

Input code

import 'reflect-metadata';

const COL_KEY = Symbol('col');

const column = () => {
    return (object: any, key: string) => {
        Reflect.defineMetadata(COL_KEY, 'value', object, key);
    };
};

class User {
    @column() currency!: 'usd' | 'eur' | 'yen';
}

console.log(Reflect.getMetadata('design:type', User.prototype, 'currency')); // undefined
// should be String

Config

{
    "jsc": {
        "parser": {
            "syntax": "typescript",
            "tsx": false,
            "decorators": true,
            "dynamicImport": false
        },
        "transform": {
            "legacyDecorator": true,
            "decoratorMetadata": true
        }
    },
    "module": {
        "type": "commonjs"
    }
}

Expected behavior
String should have been emitted.

Version
The version of @swc/core: 1.2.47

Additional context
Add any other context about the problem here.

[swc-bot]

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