add CI pipeline with lint, test, build

node_modules/istanbul-reports/lib/json/index.js

@@ -0,0 +1,44 @@
+/*
+ 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;