Issue in Typescript: The type 'RegExpMatchArray' cannot be assigned to a parameter of type 'string'

Here is the code snippet I am working with:

import { persistState } from 'redux-devtools';

const enhancer = compose(
  applyMiddleware(thunk, router, logger),
  DevTools.instrument(),
  persistState(
    window.location.href.match(/[?&]debug_session=([^&]+)\b/)
  )
);

I encountered an issue when trying to use the match function with a regular expression argument. The error message I received was:

Argument of type 'RegExpMatchArray' is not assignable to parameter of type 'string'. Matches a string with a regular expression, and returns an array containing the results of that search. (method) String.match(regexp: RegExp): RegExpMatchArray (+1 overload)

Upon further investigation using VSCode's peek definition feature, it showed:

match(regexp: string): RegExpMatchArray;
/**
  * Matches a string with a regular expression, and returns an array containing the results of that search.
  * @param regexp A regular expression object that contains the regular expression pattern and applicable flags.
  */
match(regexp: RegExp): RegExpMatchArray;

/**
  * Replaces text in a string, using a regular expression or search string.
  * @param searchValue A string that represents the regular expression.
  * @param replaceValue A string containing the text to replace for every successful match of searchValue in this string.
  */

It appears that both the argument and the parameter are of type RegExp as per the definition. So why am I getting this error?

Answer №1

According to @NitzanTomer, the issue is not with the type mismatch in the match function parameter. It seems you are attempting to assign the return value of the match function to a string variable, returning it from a :string function, or passing it as a string parameter.

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