The 'searchText' property is missing an initializer and is not definitively assigned within the constructor

Question

There is a variable declared in a class:

public searchText: string;

With strict mode enabled in TypeScript, the following error occurs:

Property 'searchText' has no initializer and is not definitely assigned in the constructor

Adding '' like this:

public searchText: string = "";

Resolves the issue, but it's puzzling why there needs to be a default empty string if it was already defined as such.

Answer 1

Answer №1

When you fail to assign a value to a variable in JavaScript, the variable will hold an 'undefined' value.

For example, if you declare a variable like this:

public searchText: string;

Then searchText=undefined and not an empty string. You can verify this by logging it to the console.

Answer 2

When you fail to assign a value to a variable in JavaScript, the variable will hold an 'undefined' value.

For example, if you declare a variable like this:

public searchText: string;

Then searchText=undefined and not an empty string. You can verify this by logging it to the console.

Answer 3

Specify the 'mark' attribute to indicate nullability.

public searchText?: string;

Alternatively, update tsconfig.ts to allow uninitialized attributes. Remove the comment on this line and set it to false.

"strictPropertyInitialization": false

Answer 4

Specify the 'mark' attribute to indicate nullability.

public searchText?: string;

Alternatively, update tsconfig.ts to allow uninitialized attributes. Remove the comment on this line and set it to false.

"strictPropertyInitialization": false