How to inject service to angular constant

javascript angularjs dependency-injection constants angularjs-service

this is not possible for two reasons.

constant can not have dependencies (see table bottom https://docs.angularjs.org/guide/providers)
constants and provider are available in .config functions (config phase), but services ($locale) are available only later (in .run function/phase)

Alternatively you can create service-type factory, which can have dependencies and can create object or primitive

angular.module('app')  .factory('LOCALE_ID', function($locale) {      return {'LOCALE': $locale.id.slice(0, 2)}  })

javascript angularjs dependency-injection constants angularjs-service

You can manually grab $locale with the $injector. Observe the following...

app.constant('SOME_CONSTANT', {     'LOCALE': angular.injector(['ng']).get('$locale').id.slice(0, 2) });

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