| toString | () => string | Returns a string representation of a string. |
| charAt | (pos: number) => string | Returns the character at the specified index. |
| charCodeAt | (index: number) => number | Returns the Unicode value of the character at the specified location. |
| concat | (...strings: string[]) => string | Returns a string that contains the concatenation of two or more strings. |
| indexOf | (searchString: string, position?: number | undefined) => number | Returns the position of the first occurrence of a substring. |
| lastIndexOf | (searchString: string, position?: number | undefined) => number | Returns the last occurrence of a substring in the string. |
| localeCompare | (that: string) => number | Determines whether two strings are equivalent in the current locale. |
| match | (regexp: string | RegExp) => RegExpMatchArray | null | Matches a string with a regular expression, and returns an array containing the results of that search. |
| replace | (searchValue: string | RegExp, replaceValue: string) => string | Replaces text in a string, using a regular expression or search string. |
| replace | (searchValue: string | RegExp, replacer: (substring: string, ...args: any[]) => string) => string | Replaces text in a string, using a regular expression or search string. |
| search | (regexp: string | RegExp) => number | Finds the first substring match in a regular expression search. |
| slice | (start?: number | undefined, end?: number | undefined) => string | Returns a section of a string. |
| split | (separator: string | RegExp, limit?: number | undefined) => string[] | Split a string into substrings using the specified separator and return them as an array. |
| substring | (start: number, end?: number | undefined) => string | Returns the substring at the specified location within a String object. |
| toLowerCase | () => string | Converts all the alphabetic characters in a string to lowercase. |
| toLocaleLowerCase | (locales?: string | string[] | undefined) => string | Converts all alphabetic characters to lowercase, taking into account the host environment's current locale. |
| toUpperCase | () => string | Converts all the alphabetic characters in a string to uppercase. |
| toLocaleUpperCase | (locales?: string | string[] | undefined) => string | Returns a string where all alphabetic characters have been converted to uppercase, taking into account the host environment's current locale. |
| trim | () => string | Removes the leading and trailing white space and line terminator characters from a string. |
| substr | (from: number, length?: number | undefined) => string | Gets a substring beginning at the specified location and having the specified length. |
| valueOf | () => string | Returns the primitive value of the specified object. |