Not possible to use the latest ember with pre-comp

Question

I have just installed the latest ember starter kit. It has:

• Ember.VERSION : 1.0.0-rc.5
• Handlebars.VERSION : 1.0.0-rc.4
• jQuery.VERSION : 1.9.1

I am using grunt-contrib-handlebars@0.5.9 to pre-compile my templates (this is the latest version available). I do not know what version of handlebars is included in that package, but I get the following error when starting the application:

Uncaught Template was precompiled with an older version of Handlebars than the current runtime. Please update your precompiler to a newer version (>= 1.0.0-rc.4) or downgrade your runtime to an older version (== 1.0.0-rc.3).

I have even tried loading another handlebars' runtime (version 1.0.0-rc.3), but ember is not happy about it:

Uncaught Error: assertion failed: Ember Handlebars requires Handlebars version 1.0.0-rc.4, COMPILER_REVISION expected: 3, got: 2 – Please note: Builds of master may have other COMPILER_REVISION values.

So ember needs 1.0.0-rc.4, but there is no grunt precompiler available for this version. Catch-22?

Should I drop pre-compiled templates? Having this break every time I upgrade ember is going to be very annoying ...

Answer 1

You could use the emberTemplates grunt task, from here: https://github.com/dgeb/grunt-ember-templates since this version has the updated dependencies and is maintained from a member of the ember core team.

As I guess you already know, to use the grunt-ember-templates you can define a dependence in your package.json

  ...
  "devDependencies": {
    ...
    "grunt-ember-templates": "0.4.7"
  }
  ...

and run npm install.

Hope it helps

Answer 2

I had the same problem - the same error message. In my case the problem was that I was using an ember library that included some templates compiled by a previous version of grunt-ember-handlebars So I got a new version of that library that was compiled by the current version of grunt-ember-handlebars and that solved the problem.