Category: TypeScript

Sometimes, we want to fix the "Cannot find module ‘fs’" error with TypeScript.

In this article, we’ll look at how to fix the "Cannot find module ‘fs’" error with TypeScript.

How to fix the "Cannot find module ‘fs’" error with TypeScript?

To fix the "Cannot find module ‘fs’" error with TypeScript, we can install the @types/node package into our Node TypeScript project.

To do this, we run

npm install --save-dev @types/node

to install @types/node as a dev dependency.

This will add the type definitions for the built-in Node modules into our project so that the "Cannot find module ‘fs’" error will go away.

Conclusion

To fix the "Cannot find module ‘fs’" error with TypeScript, we can install the @types/node package into our Node TypeScript project.

Sometimes, we want to fix the ‘Index signature is missing in type’ error with TypeScript.

In this article, we’ll look at how to fix the ‘Index signature is missing in type’ error with TypeScript.

How to fix the ‘Index signature is missing in type’ error with TypeScript?

To fix the ‘Index signature is missing in type’ error with TypeScript, we can add an index signature to the interface causing the error.

For instance, we write

interface MyInterface {
  [key: string]: string;
  myVal: string;
}

to add [key: string]: string; to MyInterface.

This will let us add any property to the object with type MyInterface with a string key and value.

Conclusion

To fix the ‘Index signature is missing in type’ error with TypeScript, we can add an index signature to the interface causing the error.

Sometimes, we want to format a datetime in TypeScript.

In this article, we’ll look at how to format a datetime in TypeScript.

How to format a datetime in TypeScript?

To format a datetime in TypeScript, we can use the date’s toLocaleString method.

For instance, we write

new Date().toLocaleString();

to call toLocaleString on a Date instance to return a human readable datetime string.

Conclusion

To format a datetime in TypeScript, we can use the date’s toLocaleString method.

Sometimes, we want to fix the "Property does not exist on type ‘{}’" error with TypeScript.

In this article, we’ll look at how to fix the "Property does not exist on type ‘{}’" error with TypeScript.

How to fix the "Property does not exist on type ‘{}’" error with TypeScript?

To fix the "Property does not exist on type ‘{}’" error with TypeScript, we can set the variable causing the error to any type.

For instance, we write

const bar: any = {};
bar.foo = "foobar";

to set the bar variable to the any type.

Then we can do anything we want with bar.

Conclusion

To fix the "Property does not exist on type ‘{}’" error with TypeScript, we can set the variable causing the error to any type.

Sometimes, we want to create an observable with a delay with Rxjs.

In this article, we’ll look at how to create an observable with a delay with Rxjs.

How to create an observable with a delay with Rxjs?

To create an observable with a delay with Rxjs, we can use the from observable with the delay and concatMap operators.

For instance, we write

import { from, of } from "rxjs";
import { delay } from "rxjs/internal/operators";
import { concatMap } from "rxjs/internal/operators";

const myArray = [1, 2, 3];

from(myArray)
  .pipe(concatMap((item) => of(item).pipe(delay(1000))))
  .subscribe((timedItem) => {
    console.log(timedItem);
  });

to create an observer from the myArray array with from.

Then we call pipe with the concatMap operator called with a callback that returns an of observable that’s delayed with the delay by 1000 milliseconds.

Conclusion

To create an observable with a delay with Rxjs, we can use the from observable with the delay and concatMap operators.