Incompatible with TypeScript 5.6

[tmcw]

We're just upgrading to TypeScript 5.6 in our project, and came across a problem in the types in react-arborist:

node_modules/react-arborist/src/interfaces/tree-api.ts:596:12 - error TS2869: Right operand of ?? is unreachable because the left operand is never nullish.

596     return !utils.access(data, check) ?? true;
               ~~~~~~~~~~~~~~~~~~~~~~~~~~

node_modules/react-arborist/src/interfaces/tree-api.ts:601:12 - error TS2869: Right operand of ?? is unreachable because the left operand is never nullish.

601     return !utils.access(data, check) ?? true;

This seems to make sense - TypeScript is right that this line:

react-arborist/modules/react-arborist/src/interfaces/tree-api.ts

Line 596 in 3cee71c

return !utils.access(data, check) ?? true;

Will never execute the branch on the right, because ! will cast the result of the utils.access call to a boolean, so it'll never be nullish, so it'll never fall back to true.