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31 lines
838 B
Lua
31 lines
838 B
Lua
if not game then script = require "test/relative-string" end
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local graph = require(script.Parent.graph)
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type Node<T> = graph.Node<T>
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local create_start_node = graph.create_start_node
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local track = graph.track
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local update = graph.update
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export type Source<T> = (() -> T) & ((T) -> T)
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local function source<T>(initial_value: T): Source<T>
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local node = create_start_node(initial_value)
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return function(...): T
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if select("#", ...) == 0 then -- no args were given
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track(node)
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return node.cache
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end
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local v = ... :: T
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if node.cache == v and (type(v) ~= "table" or table.isfrozen(v)) then
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return v
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end
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node.cache = v
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update(node)
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return v
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end
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end
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return source :: (<T>(initial_value: T) -> Source<T>) & (<T>() -> Source<T>)
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