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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Generic callback functions and 'this'","articleBody":"```\r\n/** @noSelf */\r\ndeclare namespace Test {\r\n  export function testCallback\u003cT extends (...args: any[]) =\u003e void\u003e(\r\n    callback: T,\r\n  ): FunctionContainer\u003cT\u003e;\r\n}\r\n\r\ntestCallback(() =\u003e {});\r\n```\r\n\r\nThis fails with `error TSTL: Unable to convert function with a 'this' parameter to function 'callback' with no 'this'. To fix, wrap in an arrow function, or declare with 'this: void'.`.\r\n\r\nvalidateFunctionAssignment fails here. I could make it work by returning immediately if `toType.isTypeParameter()` is true, but I suspect that's not the correct solution to this particular problem.","author":{"url":"https://github.com/DanielAdolfsson","@type":"Person","name":"DanielAdolfsson"},"datePublished":"2024-08-04T21:23:12.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/1568/TypeScriptToLua/issues/1568"}