TypeScript

Here are three ways to convert a string to a number in TypeScript. Using the unary + operator Using the parseFloat()/parseInt() method Using the Number() method Method 1: Using the (+) operator The unary + operator is “used to convert a string to a number”. When used with a string representing a valid number, it … Read more

To convert Promise to Observable in Angular, you can “use the from() function from the rxjs library.” To work with the rxjs library, you need to install it first if you have not installed it! npm install rxjs –save Import the rxjs library like this: import { from } from ‘rxjs’; Use the from() function to … Read more

To convert a Set to Array in TypeScript, you can “use the Array.from() function or Spread operator”. Method 1: Using Array.from() The Array.from() method creates a new array instance from an iterable object. Since a Set is iterable, it can be directly passed to Array.from() to create an array. let mainSet = new Set<string>(); mainSet.add(“apple”); … Read more

Here’s a step-by-step guide to importing a json file TypeScript: Step 1: Enable JSON Imports in TypeScript Configuration Ensure that you have the following setting in your tsconfig.json: { “compilerOptions”: { “moduleResolution”: “node”, “resolveJsonModule”: true, “esModuleInterop”: true } } “resolveJsonModule”: true: It allows TypeScript to understand JSON imports. “esModuleInterop”: true: It ensures compatibility between CommonJS … Read more

Angular Compiler requires TypeScript >=3.4.0 and <3.5.0 but 3.5.3 was found instead error occurs when there is a version mismatch between the Angular compiler’s expected TypeScript version and the TypeScript version installed in your project. To fix the “Angular Compiler requires TypeScript >=3.4.0 and <3.5.0 but 3.5.3 was found instead” error, you need to downgrade … Read more

Here are seven ways to dynamically assign properties to an object in TypeScript: Explicitly type the Object at declaration time Using the index notation Use the Record utility type Use the Map data type Consider an optional object property Using Object.assign() method Method 1: Explicitly type the Object at declaration time You can define the … Read more

TS1149: File name differs from already included file name only in casing error occurs in TypeScript when “importing or referencing two files in your project that differ only in their letter casing.” This can be problematic, especially on case-insensitive file systems (like the ones on macOS and Windows), because the system treats them as the … Read more

TS2693: ‘Promise’ only refers to a type, but is being used as a value here error typically occurs when you try to “use the Promise type like you would use the Promise constructor or an instance of a promise.” To fix the TypeScript TS2693: ‘Promise’ only refers to a type, but is being used as a … Read more

To set a new property on the window object in TypeScript, you can extend the Window interface or use the index notation. Method 1: Extend the Window interface You can create a new TypeScript module and extend the Window interface by adding the new property. This way, TypeScript will be aware of the property, and … Read more

Cannot find name ‘require’ error occurs when you “try to use the require() function, which is a part of the CommonJS module system, but TypeScript is unaware of it.” How to fix the cannot find name ‘require’ error? Here is the step-by-step guide to fix the cannot find name ‘ require’ error in TypeScript. Step … Read more