Create JavaScript Diagraming Library

We need a javascript library (pure or jQuery-based), that can be used directly in an HTML page, or indirectly by another javascript code, to draw diagrams (flowcharts/activity/business-process like diagrams) in the web-browser. The library should also allow some additional features. In a later release/project, this library will be used as a base library to create another libraries to draw business-specific diagrams (BPMN2, UML, …), so, it should be flexible in defining the shapes and anchor/joint points on them (maybe as SVG). Business Requirement 1- Draw diagram elements to the canvas and link them to each other. 2- Ability to move the elements around, 3- format the elements (color, resize, …), 4- Delete the elements, 5- copy/paste the elements, 6- Navigation around the canvas (zoom in/out, pan, bird-eye) 7- Save/export as JSON/XML (including the positions) 8- Open/import from JSON/XML 9- Print the diagram Technical Requirements 1- A JavaScript library that runs on the Web-browser (pure or jQuery-based). 2- Minimal and have minimum or no dependencies on other files and libraries. 3- All the code, dependencies, and files will be property and proprietary to the client. 4- All the code, dependencies, and files are fully/unlimitedly licensed to the client, or open-source with unlimited license (i.e. basic MIT, AGPL, GPL2, Apache, ...). 5- The library can work independently from any other additions. 6- The library can work on the latest versions of browsers, and backward compatible as much as possible. At least Edge, FF, Chrome, Safari, and Opera should be supported. 7- The library can be extendable using its native APIs. 8- The code is well-documented, concise, clean, organized, and apply industry standards. Using Open-Source Libraries It is fine to use an open-source library (like diagram-js, which is used by other libraries like bpmn-js [license is not good for us] to achieve exactly the same goal we are looking for). You can find a lot of libraries out there, however, whatever you will choose, please make sure you have good command on it, and can provide the customization/support that we may require.