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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 custom-calendar-vs. Try it out:
require("react/package.json"); // react is a peer dependency.
require("react-dom/package.json"); // react-dom is a peer dependency.
var customCalendarVs = require("custom-calendar-vs")
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