The provided argument in Typescript does not match the required parameter type, which should be a string

Encountering a TypeScript error with the following code:

if (this.$route?.query?.domainName) {
  this.setDomain(this.$route.query.domainName);
}

The code snippet above is causing the following error message:

TypeScript - Argument of type 'string | (string | null)[]' is not assignable to parameter of type 'string'

 if (this.$route?.query?.domainName) {
   this.setDomain(this.$route.query.domainName);
                  ^
 }

The setDomain function specifically expects a parameter of type string:

setDomain(domain: string) {
  this.domainName = domain;
}

It is puzzling why the parameter could potentially be null when I have validated the existence of the object property using the optional chaining operator (?). What could be causing this error?

javascripttypescript

Answer №1

Make sure that the variable domainName in your code is always a string and not an array containing strings or null values. The current conditional guard only checks for truthy values, not specifically for strings.

Adjust your code to validate that domainName is a string, even if it's an empty string. Your current implementation does not account for this scenario.

declare const $route: null | { query: null | { domainName: null | string | (string | null)[] } }
declare const setDomain: (domain: string) => void;

if ($route?.query?.domainName) {
    // reproduces your error
    setDomain($route.query.domainName);
}

if (typeof $route?.query?.domainName == "string") {
    // no error
    setDomain($route.query.domainName);
}

View in typescript playground

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