@lume/element/src/decorators/metadata-shim.ts

Create Custom Elements with reactivity and automatic re-rendering.

// Until decorators land natively, we need this shim so that we can use
// decorator metadata. https://github.com/microsoft/TypeScript/issues/53461

export {} // we don't export anything, but this denotes the file as a module to TypeScript

declare global {
	interface SymbolConstructor {
		readonly metadata: unique symbol
	}
}

// @ts-expect-error readonly
Symbol.metadata ??= Symbol.for('Symbol.metadata')