In Typescript, the function is expected to return a string rather than using the syntax of `() -> string`

Currently, I am attempting to implement the following code snippet for browser detection. However, I am encountering an error in relation to browserData, which states:

Type '{ browserName: () => string; browserVersion: string | null; operatingSystem: string | (() => string); } | { browserName: string; browserVersion: string; operatingSystem: string; }' is not assignable to type 'BrowserData'.
Type '{ browserName: () => string; browserVersion: string | null; operatingSystem: string | (() => string); }' is not assignable to type 'BrowserData'.
Types of property 'browserName' are incompatible.
Type '() => string' is not assignable to type 'string'.ts(2322)
function getBrowserInfo(): BrowserData {
  const browserInfo = detectBrowser.detect();
  const browserData: BrowserData =
    browserInfo !== null
      ? {
          browserName: browserInfo.name.toString,
          browserVersion: browserInfo.version,
          operatingSystem:
            browserInfo.os !== null ? browserInfo.os.toString : '',
        }
      : { browserName: '', browserVersion: '', operatingSystem: '' };
  return browserData;
}

declare type BrowserData = {
  browserName: string;
  browserVersion: string;
  operatingSystem: string;
};

The issue appears to stem from the fact that the expected return value should be a string, rather than a function that produces a string. How can I go about rectifying this discrepancy?

Answer №1

To ensure proper functionality, it is important to utilize the toString method when dealing with the browserName and potentially the operatingSystem:

function getBrowserInfo(): BrowserData {
  const browserInfo = detectBrowser.detect();
  const browserData: BrowserData =
    browserInfo !== null ?
    {
      browserName: browserInfo.name.toString(),
      browserVersion: browserInfo.version,
      operatingSystem: browserInfo.os !== null ? browserInfo.os.toString() : '',
    } :
    {
      browserName: '',
      browserVersion: '',
      operatingSystem: ''
    };
  return browserData;
}

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