index.js
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	/*
	Copyright 2012-2015, Yahoo Inc.
	Copyrights licensed under the New BSD License. See the accompanying LICENSE file for terms.
	*/
	'use strict';
	const { ReportBase } = require('istanbul-lib-report');

	class JsonReport extends ReportBase {
	constructor(opts) {
	super();

	this.file = opts.file \|\| 'coverage-final.json';
	this.first = true;
	}

	onStart(root, context) {
	this.contentWriter = context.writer.writeFile(this.file);
	this.contentWriter.write('{');
	}

	onDetail(node) {
	const fc = node.getFileCoverage();
	const key = fc.path;
	const cw = this.contentWriter;

	if (this.first) {
	this.first = false;
	} else {
	cw.write(',');
	}
	cw.write(JSON.stringify(key));
	cw.write(': ');
	cw.write(JSON.stringify(fc));
	cw.println('');
	}

	onEnd() {
	const cw = this.contentWriter;
	cw.println('}');
	cw.close();
	}
	}

	module.exports = JsonReport;