Casl: <Can> without subject

[LyhjeHylje]

I have a flat component permission-wise, I do not really use the "of" -part (or subject) of the component.
Casl seems to work fine with me leaving it out but the React component gives prop type warnings.
I have worked around this by creating a custom can-component but I'm wondering if the prop-type validation could be loosened or if there is a more elegant way handling cases like:
<Can I="post" />

Tasks:

• [x] update types for ForbiddenError.throwUnlessCan
• [x] update types for can, cannot, relevantRuleFor, rulesFor,possibleRulesForofAbility`
• [x] update types for can & cannot of AbilityBuilder
• [x] casl/angular
• [x] casl/aurelia
• [x] casl/vue
• [x] casl/react
• [x] add tests for casl/ability

[stalniy]

I thought about this recently. Actually it's a valid use case when app has a simple permission system which is based only on actions.

My thoughts on this:

• [ ] change d.ts to support can with single parameter for AbilityBuilder.can and for Ability.can
• [ ] make subject optional for Vue and React <Can> components
• [ ] provide a way to shake out conditions (including sift.js)
• [ ] add this usecase to docs

[shellydehaven]

CASL is awesome - thank you! Looking forward to this being addressed. Any thoughts on when it will be available?

[stalniy]

Currently I’m pretty busy at my job, so it’s hard to say. But PRs are welcome :)

Meanwhile you can define permissions using all subject and create a simple wrapper around ability which uses all subject as default value.

[stalniy]

After some thinking about this, I realised that on @casl/ability level it can be implemented without changes. The only thing which you need to do is to define custom subjectName function:

const subjectName = () => 'all'

const ability = AbilityBuilder.define({ subjectName }, (can) => {
  can('read')
  can('think')
})

console.log(ability.can('think')) // true
console.log(ability.can('write')) // false

The only thing which needs to be changed is Typescript declarations and complementary packages

[stalniy]

will be available in casl 4.x