Function emitDownleveledClass

tools/transformers/native-class.js:128–166

(node)

}

function emitDownleveledClass(node) {
	// Preserve leading trivia (including possible preceding import statements separated earlier by bundler) only remove the decorator itself.
	const stripped = node.getText().replace(/@NativeClass(?:\((?:.|\n)*?\))?\s*/gm, '');
	const downleveled = ts
		.transpileModule(stripped, {
compilerOptions: {
module: ts.ModuleKind.ESNext,
target: ts.ScriptTarget.ES5,
noEmitHelpers: true,
experimentalDecorators: true,
emitDecoratorMetadata: false,
useDefineForClassFields: false,
},
})
		.outputText.replace(/(Object\.defineProperty\(.*?{.*?)(enumerable:\s*false)(.*?}\))/gs, '$1enumerable: true$3');

	const helperSource = ts.createSourceFile(
		(node.getSourceFile()?.fileName ?? 'NativeClass.ts') + '.helper.js',
		downleveled,
		ts.ScriptTarget.ES5,
		true,
		ts.ScriptKind.JS,
	);

	const statements = [];
	for (const statement of helperSource.statements) {
		if (statement.kind === ts.SyntaxKind.EndOfFileToken) {
			continue;
		}
		// Explicitly skip import declarations accidentally re-emitted (shouldn't occur but defensive)
		if (ts.isImportDeclaration(statement)) {
			continue;
		}
		const prepared = prepareSynthesizedNode(statement, node);
		statements.push(prepared);
	}

	return statements;
}

function prepareSynthesizedNode(node, original) {
	const clone = ts.factory.cloneNode(node);