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tests/cases/conformance/types/primitives/string/assignFromStringInterface2.ts(47,1): error TS2322: Type 'String' is not assignable to type 'string'.
'string' is a primitive, but 'String' is a wrapper object. Prefer using 'string' when possible.
tests/cases/conformance/types/primitives/string/assignFromStringInterface2.ts(48,1): error TS2322: Type 'NotString' is not assignable to type 'string'.
==== tests/cases/conformance/types/primitives/string/assignFromStringInterface2.ts (2 errors) ====
interface String {
doStuff(): string;
}
interface NotString {
doStuff(): string;
toString(): string;
charAt(pos: number): string;
charCodeAt(index: number): number;
concat(...strings: string[]): string;
indexOf(searchString: string, position?: number): number;
lastIndexOf(searchString: string, position?: number): number;
localeCompare(that: string): number;
match(regexp: string): string[];
match(regexp: RegExp): string[];
replace(searchValue: string, replaceValue: string): string;
replace(searchValue: string, replaceValue: (substring: string, ...args: any[]) => string): string;
replace(searchValue: RegExp, replaceValue: string): string;
replace(searchValue: RegExp, replaceValue: (substring: string, ...args: any[]) => string): string;
search(regexp: string): number;
search(regexp: RegExp): number;
slice(start?: number, end?: number): string;
split(separator: string, limit?: number): string[];
split(separator: RegExp, limit?: number): string[];
substring(start: number, end?: number): string;
toLowerCase(): string;
toLocaleLowerCase(): string;
toUpperCase(): string;
toLocaleUpperCase(): string;
trim(): string;
length: number;
substr(from: number, length?: number): string;
valueOf(): string;
[index: number]: string;
}
var x = '';
var a: String;
var b: NotString;
a = x;
a = b;
b = a;
b = x;
x = a; // expected error
~
!!! error TS2322: Type 'String' is not assignable to type 'string'.
!!! error TS2322: 'string' is a primitive, but 'String' is a wrapper object. Prefer using 'string' when possible.
x = b; // expected error
~
!!! error TS2322: Type 'NotString' is not assignable to type 'string'.
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