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Title: Proposal for Parameter Type Inference for immediately invoked anonymous functions · Issue #4142 · microsoft/TypeScript · GitHub

Open Graph Title: Proposal for Parameter Type Inference for immediately invoked anonymous functions · Issue #4142 · microsoft/TypeScript

X Title: Proposal for Parameter Type Inference for immediately invoked anonymous functions · Issue #4142 · microsoft/TypeScript

Description: I have to target ES3/ES5 and I quite often find myself writing something like this: for (let roleType of this.RoleTypes) { ((roleType) => { //roleType is of type any, but should be typeof "outer" roleType observable.subscribe((nv) => {//...

Open Graph Description: I have to target ES3/ES5 and I quite often find myself writing something like this: for (let roleType of this.RoleTypes) { ((roleType) => { //roleType is of type any, but should be typeof "outer" r...

X Description: I have to target ES3/ES5 and I quite often find myself writing something like this: for (let roleType of this.RoleTypes) { ((roleType) => { //roleType is of type any, but should be typeof "...

Opengraph URL: https://github.com/microsoft/TypeScript/issues/4142

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Domain: github.com

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Proposal for Parameter Type Inference for immediately invoked anonymous functions","articleBody":"I have to target ES3/ES5 and I quite often find myself writing something like this:\n\n``` TypeScript\nfor (let roleType of this.RoleTypes) {\n    ((roleType) => {\n        //roleType is of type any, but should be typeof \"outer\" roleType\n            observable.subscribe((nv) => {//Do something with it in a function\n                this.afunction(nv, roleType2.RoleTypeID);\n            });                                    \n    })(roleType); //Protect variable scope\n}\n```\n\nor something like this:\n\n``` TypeScript\n(($) => {\n    //Why not infer $ as typeof jQuery?\n})(jQuery);\n```\n\nI think it was reasonable to infer the parameter type from its only usage here\n","author":{"url":"https://github.com/aersam","@type":"Person","name":"aersam"},"datePublished":"2015-08-04T05:46:15Z","url":"https://github.com/microsoft/TypeScript/issues/4142"}

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