negate-stage.ts
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negate-stage.ts
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	import QueryStage from "./query-stage";

	export default function negate_stage(stage: QueryStage) {
	const negated_stage: QueryStage = {};
	for (let key of Object.keys(stage) as (keyof typeof stage)[]) {
	if (key === "$or") {
	negated_stage.$nor = stage[key];
	} else if (key === "$nor") {
	negated_stage.$or = stage[key];
	} else if (key === "$and") {
	negated_stage.$or = stage[key]?.map((expression: QueryStage) =>
	negate_stage(expression)
	);
	} else {
	if (stage[key].$not) {
	negated_stage[key] = stage[key].$not;
	} else {
	negated_stage[key] = { $not: stage[key] };
	}
	}
	}
	return negated_stage;
	}