query_not.js
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query_not.js
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	const Query = require("./query.js");
	const QueryStep = require("./query-step.js");

	module.exports = class extends Query {
	constructor(query) {
	super();
	this.addQuery(query);
	}
	addQuery(query) {
	const steps = query.dump();
	this.steps.push(...steps);
	}
	dump() {
	return this.steps.map(step => step.negate());
	}
	toPipeline() {
	return this.steps.reduce(
	(acc, step) => step.negate().pushStage(acc),
	[]
	);
	}
	};