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https://github.com/littensy/charm.git
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33ecae2f50
* refactor!: use atom functions * docs: reformat api reference * docs: showcase atom functions * docs: remove unused import * refactor: finalize updates * chore: misc edits
26 lines
592 B
Lua
26 lines
592 B
Lua
local capture = require(script.Parent.capture)
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local store = require(script.Parent.store)
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local types = require(script.Parent.types)
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type Source<T> = types.Source<T>
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local function subscribe<T>(source: Source<T>, callback: (state: T, prev: T) -> ()): () -> ()
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local atoms, state = capture(source)
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local function listener()
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local prevState = state
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state = source()
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callback(state, prevState)
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end
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for atom in atoms do
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store.listeners[atom][listener] = true
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end
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return function()
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for atom in atoms do
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store.listeners[atom][listener] = nil
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end
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end
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end
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return subscribe
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