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https://github.com/littensy/charm.git
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a90d131fed
* feat: allow conditional dependencies * docs: remove conditional deps warnings * fix: allow nested captures * docs: add dev flag * fix: `try()` uses pcall if passed `finally()` * docs: interval is optional * docs: update readme * docs: add client/server tags
40 lines
843 B
Text
40 lines
843 B
Text
local store = require(script.Parent.store)
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local types = require(script.Parent.types)
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type Atom<T> = types.Atom<T>
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type AtomOptions<T> = types.AtomOptions<T>
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--[=[
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Creates a new atom with the given state.
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@param state The initial state.
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@param options Optional configuration.
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@return A new atom.
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]=]
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local function atom<T>(state: T, options: AtomOptions<T>?): Atom<T>
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local equals = options and options.equals
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local function atom(...)
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if select("#", ...) == 0 then
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for set in store.capturing do
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set[atom] = true
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end
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return state
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end
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local nextState = store.peek(..., state)
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if state ~= nextState and not (equals and equals(state, nextState)) then
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state = nextState
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store.notify(atom)
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end
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return state
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end
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store.listeners[atom] = setmetatable({}, { __mode = "v" })
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return atom
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end
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return atom
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