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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
ember is the command line interface for Ember.js whereis ember will tell you where the executable is, in my case ~/.yarn/bin/ember. Opening ~/yarn/bin/ember the first line is #!/usr/bin/env node telling us its a node app, which creates a ember-cli CLI and runs it. Parsing the command line args and creating a Command object with in turn creates the appropriate Task object and runs it. In this case it's the TestTask, which when run invokes testem, the JS test runner used by Ember.js. The TestTask also allows ember addons to inject middleware into testem. This is very similar to the ServerTask, run when using ember s, with also allows ember addons to inject middleware into the development server.