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 @nestjs/mapped-types. Try it out:
require("@nestjs/common/package.json"); // @nestjs/common is a peer dependency.
require("class-transformer/package.json"); // class-transformer is a peer dependency.
require("class-validator/package.json"); // class-validator is a peer dependency.
require("reflect-metadata/package.json"); // reflect-metadata is a peer dependency.
var mappedTypes = require("@nestjs/mapped-types")
- all documents on RunKit are public
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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