Create TypeScript Declarations from JavaScript and JSDoc

Even if you don’t write your code in TypeScript you can still generate .d.ts files to provide more information to developer tools.

For a variety of reasons, I prefer to write my code in vanilla JavaScript with JSDoc comments rather than writing in TypeScript. Today’s smart code editors, like Visual Studio Code, are able to read type information from JSDoc and provide Intellisense options as you code. However, those consuming your code may not get the same benefit unless you include a TypeScript declaration file along with the source files. Fortunately, TypeScript allows you to generate type declaration files directly from JavaScript files and will use information in JSDoc comments to assign the appropriate types.

First, make sure you have TypeScript installed:

$ npm install typescript --save-dev

Then, create a tsconfig.json file with the following options:

{
    "include": [
        "**/*.js"
    ],
    "compilerOptions": {
        "declaration": true,
        "emitDeclarationOnly": true,
        "allowJs": true
    }
}

Make sure that include specifies the files you want to generate declaration files for. The compilerOptions are:

  • declaration - generate the declarations for the files specified
  • emitDeclarationOnly - only output .d.ts files and not source files
  • allowJs - expect the source files to be JavaScript

#javascript #typescript #programming #developer #web-development

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Create TypeScript Declarations from JavaScript and JSDoc

Create TypeScript Declarations from JavaScript and JSDoc

Even if you don’t write your code in TypeScript you can still generate .d.ts files to provide more information to developer tools.

For a variety of reasons, I prefer to write my code in vanilla JavaScript with JSDoc comments rather than writing in TypeScript. Today’s smart code editors, like Visual Studio Code, are able to read type information from JSDoc and provide Intellisense options as you code. However, those consuming your code may not get the same benefit unless you include a TypeScript declaration file along with the source files. Fortunately, TypeScript allows you to generate type declaration files directly from JavaScript files and will use information in JSDoc comments to assign the appropriate types.

First, make sure you have TypeScript installed:

$ npm install typescript --save-dev

Then, create a tsconfig.json file with the following options:

{
    "include": [
        "**/*.js"
    ],
    "compilerOptions": {
        "declaration": true,
        "emitDeclarationOnly": true,
        "allowJs": true
    }
}

Make sure that include specifies the files you want to generate declaration files for. The compilerOptions are:

  • declaration - generate the declarations for the files specified
  • emitDeclarationOnly - only output .d.ts files and not source files
  • allowJs - expect the source files to be JavaScript

#javascript #typescript #programming #developer #web-development

Hans  Marvin

Hans Marvin

1636269900

TypeScript option you want to enable beyond strict : noUncheckedIndexedAccess

strict (and its sub flag strictNullChecks) can really help prevent null and undefined errors in your runtime #JavaScript. However, it doesn't defend against invalid array and object access.

In this lesson we look at a flag that protects against rogue undefined that might end up in your #TypeScript if this flag is not enabled 

#typescript #javascript 

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What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");
</script>

How to comment JavaScript code?

  • For single line comment in JavaScript we have to use // (double slashes)
  • For multiple line comments we have to use / * – – * /
<script type="text/javascript">

//single line comment

/* document.write("Hello"); */

</script>

Advantages and Disadvantages of JavaScript

#javascript #javascript code #javascript hello world #what is javascript #who invented javascript

CSS Boss

CSS Boss

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How to create a calculator using javascript - Pure JS tutorials |Web Tutorials

In this video I will tell you How to create a calculator using javascript very easily.

#how to build a simple calculator in javascript #how to create simple calculator using javascript #javascript calculator tutorial #javascript birthday calculator #calculator using javascript and html

Hire Dedicated JavaScript Developers -Hire JavaScript Developers

It is said that a digital resource a business has must be interactive in nature, so the website or the business app should be interactive. How do you make the app interactive? With the use of JavaScript.

Does your business need an interactive website or app?

Hire Dedicated JavaScript Developer from WebClues Infotech as the developer we offer is highly skilled and expert in what they do. Our developers are collaborative in nature and work with complete transparency with the customers.

The technology used to develop the overall app by the developers from WebClues Infotech is at par with the latest available technology.

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