Category: TypeScript

Sometimes, we want to disable TypeScript warnings in VS Code.

In this article, we’ll look at how to disable TypeScript warnings in VS Code.

How to disable TypeScript warnings in VS Code?

To disable TypeScript warnings in VS Code, we can set a few options in our VS Code settings to disable them.

For instance, we add

{
  //...
  "typescript.validate.enable": false,
  "javascript.validate.enable": false
  //...
}

in our settings.json file to disable TypeScript and JavaScript warnings by setting typescript.validate.enable and javascript.validate.enable to false respectively.

Conclusion

To disable TypeScript warnings in VS Code, we can set a few options in our VS Code settings to disable them.

Sometimes, we want to use Promise.all() with TypeScript.

In this article, we’ll look at how to use Promise.all() with TypeScript.

How to use Promise.all() with TypeScript?

To use Promise.all() with TypeScript, we can use it as we do with JavaScript.

For instance, we write

const [foo, bar] = await Promise.all([fooPromise, barPromise]);

in an async function.

We call Promise.all to return a promise with an array of the resolved values from the array of promises we passed into Promise.all.

The TypeScript compiler will infer the type automatically and make sure they’re consistent between both objects so we don’t have to specify them ourselves.

Conclusion

To use Promise.all() with TypeScript, we can use it as we do with JavaScript.

Sometimes, we want to set an import path alias with TypeScript.

In this article, we’ll look at how to set an import path alias with TypeScript.

How to set an import path alias with TypeScript?

To set an import path alias with TypeScript, we can add the alias to the paths option array in tsconfig.json.

For instance, we write

{
  "compilerOptions": {
    "baseUrl": ".",
    "paths": {
      "angular2/*": ["../path/to/angular2/*"],
      "local/*": ["../path/to/local/modules/*"]
    }
  }
}

to add the angular/2 alias which is set to ["../path/to/angular2/*"].

We also add the local/* alias which is set to ["../path/to/local/modules/*"].

Then in our project, we can import members from the listed paths with

import { bootstrap } from "angular2/bootstrap";
import { module } from "local/module";

Conclusion

To set an import path alias with TypeScript, we can add the alias to the paths option array in tsconfig.json.

Sometimes, we want to compare enums in TypeScript.

In this article, we’ll look at how to compare enums in TypeScript.

How to compare enums in TypeScript?

To compare enums in TypeScript, we can assign a value to each enum so we can compare them easily.

For instance, we write

enum AnimalInfo {
  Tiger = "Tiger",
  Lion = "Lion",
}

let tigerStr = "Tiger";

if (tigerStr === AnimalInfo.Tiger) {
  console.log("true");
} else {
  console.log("false");
}

to create the AnimalInfo enum which has values assigned to each entry.

Then we compare tigerStr to AnimalInfo.Tiger with tigerStr === AnimalInfo.Tiger.

AnimalInfo.Tiger is 'Tiger' since we assigned 'Tiger‘ to Tiger in AnimalInfo.

Conclusion

To compare enums in TypeScript, we can assign a value to each enum so we can compare them easily.

Sometimes, we want to attach to a stateless component’s ref in React.

In this article, we’ll look at how to attach to a stateless component’s ref in React.

How to attach to a stateless component’s ref in React?

To attach to a stateless component’s ref in React, we can use the useRef hook.

For instance, we write

const CustomTextInput = (props) => {
  const textInput = useRef();

  const handleClick = () => {
    textInput.current.focus();
  };

  return (
    <div>
      <input type="text" ref={textInput} />
      <input type="button" value="Focus the text input" onClick={handleClick} />
    </div>
  );
};

to create the textInput ref with the useRef hook,

Then we assign the set the ref prop’s value to textInput.

And then we can access the input element from textInput.current as we have in handleClick.

Conclusion

To attach to a stateless component’s ref in React, we can use the useRef hook.