TypeScript is a subset of JavaScript.
To convert a string to an enum in TypeScript, you can use the “enum’s string values”. Here’s a step-by-step guide to help you achieve this: Step 1: Define the Enum enum MyEnum { ValueA = “VALUE_A”, ValueB = “VALUE_B”, ValueC = “VALUE_C”, } Step 2: Create a function to convert the string to the Enum … Read more
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 TypeScript to a compatible version. For example, typescript@3.4.0 will fix this error. You can install typescript@3.4.0 using the below command. npm install typescript@3.4.0 –save-dev This command will install TypeScript version 3.4.0 as a development dependency … Read more
To fix the “File name differs from already included file name only in casing” error in TypeScript, ensure that the “forceConsistentCasingInFileNames” option is set to “true” in your tsconfig.json file. This helps enforce consistent casing for file names in your project and avoid similar issues in the future. { “compilerOptions”: { “forceConsistentCasingInFileNames”: true, … }, … Read more
TypeScript TS2693: ‘Promise’ only refers to a type, but is being used as a value here error occurs when you are trying to create a new Promise without having the proper Promise type definition in your environment. To fix the TS2693: ‘Promise’ only refers to a type, but is being used as a value here … Read more
To implement class constants in TypeScript, use the “static readonly” modifier. This creates a property that belongs to the class itself (not to its instances) and cannot be modified once it’s initialized. Example class MyClass { static readonly CONSTANT_VALUE: string = “Yello, Homer!”; } console.log(MyClass.CONSTANT_VALUE); Output Yello, Homer! In this code example, we defined a … Read more
To remove an element from an array in TypeScript, you can use the “array.splice()” or “array.filter()” method. Method 1: Using the array.splice() function The array.splice() method modifies the original array by removing or replacing elements. It takes two arguments: the start index and the number of elements to delete. Example const arr = [1, 2, 3, … Read more
To fix the “not assignable to parameter of type never” error in TypeScript, you can review your code and ensure the type inference is correct. If necessary, update your code to handle all cases and types correctly or explicitly specify the variable type instead of relying on type inference. This way, TypeScript will not infer … Read more
To dynamically assign properties to an object in TypeScript, you can use the “index notation” or the “Object.assign()” method. Method 1: Using the index notation In this approach, you first create an object with an index signature, allowing it to have any property with a string key and value. Then, you use index notation to … Read more
Is it possible to pass strongly–typed functions as parameters in TypeScript? Yes, it is possible to use strongly-typed functions as parameters in TypeScript. To pass strongly-typed functions as parameters in TypeScript, “define the function parameter type by specifying the input types and the return type“. Example Suppose you want a function execute that accepts a … Read more
The “Property ‘…’ has no initializer and is not definitely assigned in the constructor” error occurs when TypeScript’s strictPropertyInitialization option is enabled (either directly or by enabling the strict option) and a class property is not initialized or assigned a value in the constructor. To fix the “Property ‘…’ has no initializer and is not … Read more