Category: TypeScript

Sometimes, we want to fix Can’t find TypeScript compiler: Command "tsc" is not valid with TypeScript.

In this article, we’ll look at how to fix Can’t find TypeScript compiler: Command "tsc" is not valid with TypeScript.

How to fix Can’t find TypeScript compiler: Command "tsc" is not valid with TypeScript?

To fix Can’t find TypeScript compiler: Command "tsc" is not valid with TypeScript, we install the typescript package.

To install it, we run

npm install -g typescript

to install the package globally.

Then we can run tsc anywhere.

Conclusion

To fix Can’t find TypeScript compiler: Command "tsc" is not valid with TypeScript, we install the typescript package.

Sometimes, we want to fix Property ‘click’ does not exist on type ‘Element’ with TypeScript.

In this article, we’ll look at how to fix Property ‘click’ does not exist on type ‘Element’ with TypeScript.

How to fix Property ‘click’ does not exist on type ‘Element’ with TypeScript?

To fix Property ‘click’ does not exist on type ‘Element’ with TypeScript, we cast the element as a HTMLElement.

For instance, we write

const [element] = document.getElementsByClassName("btn");
(element as HTMLElement).click();

to select the elements with class btn with getElementsByClassName.

Then we get the element and cast it to an HTMLElement with as.

Finally, we call click on it to click it.

Conclusion

To fix Property ‘click’ does not exist on type ‘Element’ with TypeScript, we cast the element as a HTMLElement.

Sometimes, we want to break a forEach loop in TypeScript.

In this article, we’ll look at how to break a forEach loop in TypeScript.

How to break forEach loop in TypeScript?

To break a forEach loop in TypeScript, we replace it with a for-of loop.

For instance, we write

for (const a of ratings) {
  if (somethingWrong) {
    break;
  }
  //...
}

to loop through the ratings array.

And if somethingWrong is true, we use break to stop the loop.

Conclusion

To break a forEach loop in TypeScript, we replace it with a for-of loop.

Sometimes, we want to check if a specific object is empty in TypeScript

In this article, we’ll look at how to check if a specific object is empty in TypeScript.

How to check if a specific object is empty in TypeScript?

To check if specific object is empty in TypeScript, we can use the Object.keys method.

For instance, we write

class Brand {}
const brand = new Brand();

if (Object.keys(brand).length === 0) {
  console.log("No properties");
}

to check if the brand object is empty with Object.keys(brand).length === 0.

Object.keys returns an array of non-inherited string keys in brand.

So if the returned array’s length is 0, then it’s empty.

Conclusion

To check if specific object is empty in TypeScript, we can use the Object.keys method.