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Typings is only necessary when you cannot find the d.ts files from http://microsoft.github.io/TypeSearch/.

Typings is still useful for .d.ts files on package repositories other than NPM (such as directly from GitHub, Bitbucket, etc). Even then, for the moment it has more flexibility for NPM typings than Typescript on its own. Plus, it's still somewhat nice to keep your type definition dependencies in a separate typings.json rather than mixed in with package.json dependencies.

Also, for me it's still unclear how versioning is handled. It always seems like you have to use the latest version of the .d.ts and hope it works with your actual package version.

`.d.ts` packages should align on major.minor version numbers, so you'll be able to snap to a version and update appropriately.