Auto update dependencies, when immer's produce.
This providing way to manage normalized (tree|graph) structure
.
Current status: API designing
- Strongly typed
- Keep immer's produce API
- Support tree and graph structure
See below, Thats two state are same structure in mental model.
const state = {
tasks: [{
id: 1,
name: 'task1',
children: [{
id: 2,
name: 'task2',
children: [{
id: 3,
name: 'task3'
}]
}]
}]
};
const next = produce(state, draft => {
draft.tasks.children[0].children[0].name = 'task3 - updated';
});
// `task1` updated. ✓
expect(next.tasks[0]).not.toEqual(state.tasks);
// `task2` updated. ✓
expect(next.tasks[0].children[0]).not.toEqual(state.tasks.children[0]);
// `task3` updated. ✓
expect(next.tasks[0].children[0].children[0]).not.toEqual(state.tasks.children[0].children[0]);
const state = {
tasks: [
{ id: 1, name: 'task1', parentId: null },
{ id: 2, name: 'task2', parentId: 1 },
{ id: 3, name: 'task3', parentId: 2 }
]
};
const next = produce(state, draft => {
draft.tasks[2].name = 'task3 - updated';
});
// `task1` updated. 💥
expect(next.tasks[0]).not.toEqual(state.tasks[0]);
// `task2` updated. 💥
expect(next.tasks[1]).not.toEqual(state.tasks[1]);
// `task3` updated. ✓
expect(next.tasks[2]).not.toEqual(state.tasks[2]);
immer-deps
solve this mismatching in mental model.
import { produce } from 'immer';
import { deps } from 'immer-deps';
type State = {
tasks: {
id: number;
name: string;
parentId: number | null;
}[];
};
/**
* Wrap produce function.
*/
const produceWithDeps = deps<State>(produce, define => ([
/**
* Define dependencies on part of state.
*/
define('tasks', Number)((state, task) => (
state.tasks.filter(t => t.id === task.parentId
) /* will needs option here? */)
]));
const state: State = {
tasks: [
{ id: 1, name: 'todo1', parentId: null },
{ id: 2, name: 'todo2', parentId: 1 },
{ id: 3, name: 'todo3', parentId: 2 },
]
};
const next = produceWithDeps(state, state => {
state.tasks[2].name = 'todo3 - updated';
});
// `state.tasks[0]` was updated via dependent on `state.tasks[1]`.
// `state.tasks[1]` was updated via dependent on `state.tasks[2]`.
// `state.tasks[2]` was updated via it self`.
- Support immer's produce API
- Support environments without
Symbol
- Support adding/deleting state
- Testing in real world apps