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lang-js
{[P in K]: V}instead of{[k: K]: V}. This is equivalent toRecord<K, V>. See the answer to the linked question for more information.P in Kwill treat K as a union of string values. I'm looking to get the type ofknot the value. Something like [k: string]: V]that will work but if I replacestring withK`. It won't be happy.Record<K, V>doesn’t work for you. You say “it won’t work”… have you tried it?Type 'K' is not assignable to type 'string | number | symbol'" instead of "An index signature parameter type must be either 'string' or 'number'".