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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Typed ...rest parameters with generics","articleBody":"Is it possible to add type info to the rest parameters in a way that each individual parameter can have a different type?\n\nThis works, but with this there can be any number parameters, and all have to have the same type:\n\n```\nfunction myFunction\u003cT\u003e(...args:T[]) {\n}\nmyFunction\u003cnumber\u003e(1, 3);\n```\n\nIt would be really useful if I could force the exact number of arguments and the types for each one, but all this within generics, so something like this (but this is obviously syntactically wrong):\n\n```\nfunction myFunction\u003cT\u003e(...args:T) {\n}\n\ninterface MyParams {\n    [0]:string;\n    [1]:number;\n}\n\nmyFunction\u003cMyParams\u003e(\"a\", 1)\n```\n\nAn example use case is writing an observer class that the user could specify the arguments of the listener functions for:\n\n```\nclass Observer\u003cT\u003e {\n    addListener(...args:T) {\n    }\n}\n```\n\nIf this is not supported, what do you recommend using instead? I can use any[] of course, or living with the constraint of having a fixed number of fixed typed parameters.\n","author":{"url":"https://github.com/andrewvarga","@type":"Person","name":"andrewvarga"},"datePublished":"2014-11-01T14:00:42.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":13},"url":"https://github.com/1024/TypeScript/issues/1024"}