How to use the node-firebird-driver/dist/lib/impl.sqlTypes.SQL_VARYING function in node-firebird-driver

export function fixMetadata(status: fb.Status, metadata?: fb.MessageMetadata): fb.MessageMetadata | undefined {
	if (!metadata)
		return undefined;

	let ret: fb.MessageMetadata;

	const outBuilder = metadata.getBuilderSync(status)!;
	try {
		for (let i = metadata.getCountSync(status) - 1; i >= 0; --i) {
			switch (metadata.getTypeSync(status, i)) {
				// Transforms CHAR descriptors to VARCHAR.
				case sqlTypes.SQL_TEXT:
					outBuilder.setTypeSync(status, i, sqlTypes.SQL_VARYING);
					break;

				// Transforms numeric descriptors to DOUBLE PRECISION.
				case sqlTypes.SQL_SHORT:
				case sqlTypes.SQL_LONG:
				case sqlTypes.SQL_INT64:
				case sqlTypes.SQL_FLOAT:
					outBuilder.setTypeSync(status, i, sqlTypes.SQL_DOUBLE);
					outBuilder.setLengthSync(status, i, 8);
					outBuilder.setScaleSync(status, i, 0);
					break;
			}
		}

		ret = outBuilder.getMetadataSync(status)!;
	}