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Stacks.js 
 
- whenChainId(chainId: ChainID): (<T>(chainIdMap: WhenChainIdMap<T>) => T)
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Returns (<T>(chainIdMap: WhenChainIdMap<T>) => T)
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- <T>(chainIdMap: WhenChainIdMap<T>): T
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Parameters
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chainIdMap: WhenChainIdMap<T>
 
 Returns T