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I would say that one of Dart's goals is certainly toolability. We ship a Dart Editor, and an analyzer, that supports refactoring, code completion, jump to definition, and more.

[disclaimer: I work on the Dart team.]

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As I see it, TypeScript brings static typing and better tooling to the existing Javascript stack; Dart is a green field effort to reinvent the stack with some static typing and better tooling, among other things (new APIs, a faster VM, etc...).

[disclaimer: MS employee and PL designer/enthusiast, but no relationship with TypeScript]

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