Overriding interface property type defined in Typescript d.ts file
Is there a way to change the type of interface property defined in a *.d.ts in typescript? for example: An interface in x.d.ts is defined as interface A { property: number; } I want to change it in the typescript files that I write to interface A { property: Object; } or even this would work interface B extends A { property: Object; } Will this approach work? It didn't work when I tried on my syst
In TypeScript, what is the ! (exclamation mark / bang) operator when dereferencing a member?
When looking at the source code for a tslint rule, I came across the following statement: if (node.parent!.kind === ts.SyntaxKind.ObjectLiteralExpression) { return; } Notice the ! operator after node.parent. Interesting! I first tried compiling the file locally with my currently installed version of TS (1.5.3). The resulting error pointed to the exact location of the bang: $ tsc --noImplicitAny me
When to use JSX.Element vs ReactNode vs ReactElement?
I am currently migrating a React application to TypeScript. So far, this works pretty well, but I have a problem with the return types of my render functions, specifically in my functional components. I have always used JSX.Element as the return type, now this doesn't work any more if a component decides to not render anything, i.e. returns null, since null is not a valid value for JSX.Element. Th
Typescript eslint - Missing file extension "ts" import/extensions
I have a simple Node/Express app made with Typescript. And eslint give me the error Missing file extension "ts" for "./lib/env" import/extensions Here is my .eslintrc file { "extends": [ "airbnb", "plugin:@typescript-eslint/recommended", "prettier", "prettier/react", "plugin:import/errors", "plugin:import/warnings", "plugin:import/typescript" ], "parser": "@typescript-eslint/parser", "plugins": ["
Typescript, how to pass "Object is possibly null" error?
I've got the "Object is possibly null" error many times and usually I use a safety "if statement" in case it returns null. I've got the following function: const ModalOverlay = (props: any[]) => { const overlayEl = useRef(null); useEffect(() => { overlayEl.current.focus(); }); return <div {...props} ref={overlayEl} />; } But overlayEl.current gets the error "Object is not defined". So I've tried:
javascript - Property 'value' does not exist on type EventTarget in TypeScript - Stack Overflow
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Property 'value' does not exist on type 'EventTarget'
I am using TypeScript Version 2 for an Angular 2 component code. I am getting error "Property 'value' does not exist on type 'EventTarget'" for below code, what could be the solution. Thanks! e.target.value.match(/\S+/g) || []).length import { Component, EventEmitter, Output } from '@angular/core'; @Component({ selector: 'text-editor', template: ` <textarea (keyup)="emitWordCount($event)"></textar
Property 'dataset' does not exist on type 'EventTarget'
When trying to access the dataset on a button after a click, I get this^ error. linkProvider = (ev: React.SyntheticEvent<EventTarget>) => { console.debug('ev.target', ev.target.dataset['ix']) // error } // in render providers.map((provider, ix) => ( <button key={provider} data-ix={ix} onClick={this.linkProvider}>{provider}</button> )) Any ideas how to make it work?
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