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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Higher order type inference from generic React component","articleBody":"\u003c!-- 🚨 STOP 🚨 𝗦𝗧𝗢𝗣 🚨 𝑺𝑻𝑶𝑷 🚨\r\n\r\nHalf of all issues filed here are duplicates, answered in the FAQ, or not appropriate for the bug tracker. Even if you think you've found a *bug*, please read the FAQ first, especially the Common \"Bugs\" That Aren't Bugs section!\r\n\r\nPlease help us by doing the following steps before logging an issue:\r\n  * Search: https://github.com/Microsoft/TypeScript/search?type=Issues\r\n  * Read the FAQ: https://github.com/Microsoft/TypeScript/wiki/FAQ\r\n\r\nPlease fill in the *entire* template below.\r\n--\u003e\r\n\r\n\u003c!-- Please try to reproduce the issue with `typescript@next`. It may have already been fixed. --\u003e\r\n**TypeScript Version:**  3.4.1\r\n\r\n\u003c!-- Search terms you tried before logging this (so others can find this issue more easily) --\u003e\r\n**Search Terms:**\r\n\r\n**Code**\r\n\r\n```ts\r\ninterface Component\u003cP\u003e {\r\n    (props: P): unknown;\r\n    // Comment this out and it works\r\n    defaultProps?: Partial\u003cP\u003e;\r\n}\r\ndeclare function myHoc\u003cProps\u003e(C: Component\u003cProps\u003e): Component\u003cProps\u003e;\r\n\r\ntype Props\u003cT\u003e = { t: T; foo: number };\r\ndeclare function MyComponent\u003cT\u003e(props: Props\u003cT\u003e): unknown;\r\n// Expected type: \u003cT\u003e(props: Props\u003cT\u003e) =\u003e unknown\r\n// Actual type: Component\u003cProps\u003c{}\u003e\u003e\r\nconst MyComponent2 = myHoc(MyComponent);\r\n\r\n// Workaround: assert the resulting type\r\nconst MyComponent3 = myHoc(MyComponent) as typeof MyComponent;\r\n```","author":{"url":"https://github.com/OliverJAsh","@type":"Person","name":"OliverJAsh"},"datePublished":"2019-03-29T21:23:04.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":9},"url":"https://github.com/30650/TypeScript/issues/30650"}