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class Product { name; price; constructor(name, price) { this.name = name; try { this.price = price * 1.30; } catch(e) { throw new Error("Product canno 阅读全文
posted @ 2024-08-11 22:03
Zhentiw
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Here we're attempting to import several PNG files into our TypeScript program: import pngUrl1 from "./example1.png"; // red squiggly line under "./exa 阅读全文
posted @ 2024-08-08 19:20
Zhentiw
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Here we're importing a function myModuleFunc from my-module: import { myModuleFunc } from "my-module"; // red squiggly line under "my-module" Let's st 阅读全文
posted @ 2024-08-08 19:17
Zhentiw
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In tsconfig file, you have targetand libsconfiguration. You always need to define a target, recommended as es2022 Specifying the lib option also lets 阅读全文
posted @ 2024-08-08 19:01
Zhentiw
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Docs: https://webkit.org/blog/6240/ecmascript-6-proper-tail-calls-in-webkit/ /* This is a recursive function without PTC */ function fatorial(n) { if 阅读全文
posted @ 2024-08-07 19:29
Zhentiw
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The declare keyword in TypeScript allows you to specify types for global variables. Whenever you use it, an ambient context is created, which means th 阅读全文
posted @ 2024-08-07 19:13
Zhentiw
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Typescript check a file whether it contains any export/import, if it is, then it's a module; if not then it's a script. What's the difference between 阅读全文
posted @ 2024-08-07 19:04
Zhentiw
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/** * How do we annotate the errors this function throws? */ type PossibleErrors = SyntaxError | DOMException; const getUserFromLocalStorage = (id: st 阅读全文
posted @ 2024-08-07 18:58
Zhentiw
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For the following code: const objOfFunctions = { string: (input: string) => input.toUpperCase(), number: (input: number) => input.toFixed(2), boolean: 阅读全文
posted @ 2024-08-07 17:53
Zhentiw
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import { expect, it, vitest } from 'vitest'; const logId = (obj: { id: string }) => { console.log(obj.id); }; const logName = (obj: { name: string }) 阅读全文
posted @ 2024-08-06 19:56
Zhentiw
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