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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"lib.d.ts Function.bind with this","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. Please read the FAQ first, especially the \"Common Feature Requests\" section.\r\n\r\n--\u003e\r\n\r\n## Search Terms\r\n\r\n\u003c!-- List of keywords you searched for before creating this issue. Write them down here so that others can find this suggestion more easily --\u003e\r\n\r\n## Suggestion\r\n\r\ni don't know what is better name for `ITSOverwriteThisFunction`\r\n\r\n```ts\r\ninterface Function2 extends Function\r\n{\r\n\tbind\u003cT extends any, F extends (...args: any[]) =\u003e any\u003e(this: F, thisArg: T, ...argArray: any[]): ITSOverwriteThisFunction\u003cT, F\u003e;\r\n}\r\n\r\nexport type ITSOverwriteThisFunction\u003cT extends any, F extends (...args: any[]) =\u003e any\u003e =\r\n\t(this: T, ...args: Parameters\u003cF\u003e) =\u003e ReturnType\u003cF\u003e\r\n```\r\n\r\n## Use Cases\r\n\r\n\u003c!--\r\nWhat do you want to use this for?\r\nWhat shortcomings exist with current approaches?\r\n--\u003e\r\n\r\n1. we can now let `fn.bind`, know who is `this`\r\n\r\n\u003e problem: current typescript not support overload function, so this has limit\r\n\r\n\r\n## Examples\r\n\r\n\u003e this examples looks so stupid, but i don't know how to make look better\r\n\r\n```ts\r\nexport interface t4 extends Function2\r\n{\r\n\t(): string\r\n}\r\n\r\nexport declare let t5: t4\r\n\r\nexport let t6 = t5.bind([] as string[])\r\n\r\nt6 = function ()\r\n{\r\n\tthis.includes('') // =\u003e this is string[]\r\n\r\n\treturn ''\r\n}\r\n```\r\n\r\n## Checklist\r\n\r\nMy suggestion meets these guidelines:\r\n\r\n* [ ] This wouldn't be a breaking change in existing TypeScript/JavaScript code\r\n* [ ] This wouldn't change the runtime behavior of existing JavaScript code\r\n* [ ] This could be implemented without emitting different JS based on the types of the expressions\r\n* [ ] This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, etc.)\r\n* [ ] This feature would agree with the rest of [TypeScript's Design Goals](https://github.com/Microsoft/TypeScript/wiki/TypeScript-Design-Goals).\r\n\r\n","author":{"url":"https://github.com/bluelovers","@type":"Person","name":"bluelovers"},"datePublished":"2018-11-16T07:38:10.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/28571/TypeScript/issues/28571"}