Known issues with the upgrade include Google recommending leaving TypeScript's StrictNullChecks setting turned off, as more work needs to be done in this vein. Developers should use NPM to update to version 4.0.0 on Windows, Linux, and Mac systems. Google also is working on an interactive Angular Upgrade Guide, featuring information on making changes to applications.
Angular has been popular with developers, recently rated as the second-most-wanted framework behind Node.js in a recent Stack Overflow survey of developers. Upcoming releases planned for Angular include versions 5.0.0, due in September or October, and 6.0.0, due a year from now. Version 4.1 also is planned.
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