Cypress' built-in lodash types are incompatible with TypeScript 5.2+.

[threehams]

Current behavior

Cypress' contains the following line in node_modules/cypress/types/lodash.d.ts, which is created by the cypress package somehow (it is not a normal node_modules dependency, and not part of source):

// Backward compatibility with --target es5
declare global {
    // tslint:disable-next-line:no-empty-interface
    interface Set<T> { }
    // tslint:disable-next-line:no-empty-interface
    interface Map<K, V> { }
    // tslint:disable-next-line:no-empty-interface
    interface WeakSet<T> { }
    // tslint:disable-next-line:no-empty-interface
    interface WeakMap<K extends object, V> { }
}

This is based on lodash types 4.14.168, last updated a little over 3 years ago.

When TypeScript 5.2+ is set up with "lib": ["esnext"], the following error occurs when running tsc:

node_modules/cypress/types/lodash/index.d.ts:45:15 - error TS2428: All declarations of 'WeakMap' must have identical type parameters.

45     interface WeakMap<K extends object, V> { }
                 ~~~~~~~

node_modules/typescript/lib/lib.es2015.collection.d.ts:63:11 - error TS2428: All declarations of 'WeakMap' must have identical type parameters.

63 interface WeakMap<K extends WeakKey, V> {
             ~~~~~~~

node_modules/typescript/lib/lib.es2015.iterable.d.ts:162:11 - error TS2428: All declarations of 'WeakMap' must have identical type parameters.

162 interface WeakMap<K extends WeakKey, V> { }
              ~~~~~~~

node_modules/typescript/lib/lib.es2015.symbol.wellknown.d.ts:140:11 - error TS2428: All declarations of 'WeakMap' must have identical type parameters.

140 interface WeakMap<K extends WeakKey, V> {
              ~~~~~~~

Desired behavior

Cypress can exist in a TypeScript project using "lib": ["esnext"] without errors.

Test code to reproduce

Minimal repro at https://github.com/threehams/cypress-typescript-5-4

Cypress Version

13.9.0

Node version

20.10.0

Operating System

MacOS 14.4.1

Debug Logs

No response

Other

No response