RunKit + 
Try any Node.js package right in your browser
This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 1,000,000+ packages pre-installed, including @project-r/template-newsletter. Try it out:
require("d3-format/package.json"); // d3-format is a peer dependency.
require("d3-time-format/package.json"); // d3-time-format is a peer dependency.
require("glamor/package.json"); // glamor is a peer dependency.
require("mdast-react-render/package.json"); // mdast-react-render is a peer dependency.
require("react/package.json"); // react is a peer dependency.
require("react-dom/package.json"); // react-dom is a peer dependency.
var templateNewsletter = require("@project-r/template-newsletter")
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require()any package directly from npm- use arrow functions, classes, template strings, and most of ES6
awaitany promise instead of using callbacks (example)- create your own embedded node.js snippets
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