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  • Framework
  • Learning
  • TypeScript

Make (array) a built in helper


Today, when using gjs/gts/<template>, in order make arrays in templates, folks must import the (array) helper. Because creating arrays is fairly commonplace, this is an annoyance for developers, in part, due to how almost every other language has array literal syntax.

This RFC proposes that (array) be built in to glimmer-vm and not require importing.


Arrays and Objects are not only very common to create, they are essential tools when yielding data out of components.

There is alternate motivation to implement literals for arrays and objects, but that is a bigger can of worms for another time.

Detailed design

This change would affect strict-mode only. This is so that today's existing code that imports array from @ember/helper will still work due to how values defined locally in scope override globals.

The behavior of array would be the same as it is today, but defined by default in the glimmer-vm.

Being built in can give folks confidence that each element in the array is individually reactive.

How we teach this

Once implemented, the guides, if they say anything about gjs/gts/<template> and array by the time this would be implemented, would only remove the import.

The guides should also detail which functions are built in to the framework and, therefore, do not need to be imported.


People may not know where array is defined.

  • counterpoint: do they need to?



Unresolved questions