swc_ecma_transforms_base 43.0.0

rust port of babel and closure compiler.
Documentation 
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function _initializer_warning_helper(descriptor, context) {
    throw new Error(
        "Decorating class property failed. Please ensure that " + "proposal-class-properties is enabled and set to use loose mode. "
            + "To use proposal-class-properties in spec mode with decorators, wait for "
            + "the next major version of decorators in stage 2."
    );
}