build/lib/mangleTypeScript.ts/ClassData/_getFieldType
class ClassData:	private static _getFieldType(node: ts.Node): FieldType {
		if (hasModifier(node, ts.SyntaxKind.PrivateKeyword)) {
			return FieldType.Private;
		} else if (hasModifier(node, ts.SyntaxKind.ProtectedKeyword)) {
			return FieldType.Protected;
		} else {
			return FieldType.Public;
		}
	}