how is ImmerJS "strongly typed" if its plain javascript?

Question

ImmerJS quotes itself as:

Strongly typed, no string based paths selectors etc.

https://immerjs.github.io/immer/docs/introduction#benefits

If it's plain JS I wonder how it can be typed?
What does 'strongly typed' mean in the context of JS?

What is their alternative to string based path selectors? eg get(state, 'fruit.apples') That we should only use array based selectors eg createSelector(['fruit', 'bananas'])?

Immer is built using Typescript, which is strongly typed and compile to js. — Carlos Moreira, Feb 06 '20 at 20:10
It also comes with typescript bindings, but that doesn't make it 'strongly typed' to *use* as a consumer of the library. — dcsan, Feb 06 '20 at 23:48

score 0 · Answer 1 · answered Jun 11 '20 at 10:05

TypeScript has typings for all native JavaScript API, such as offering autocompletion for array.splice, accessing object properties etc.

Because with Immer you use basically only plain JavaScript APIs, they are strongly typed out of the box.

So in your example, with Immer you'd just state.fruit.apples.push({ name: "golden delicious"}) rather than working with selectors, which is strongly typed (assuming that state typed)

how is ImmerJS "strongly typed" if its plain javascript?

1 Answers1