In `@lib/util.js`:
- Around line 1001-1005: The current factory-path treats a returned Promise as a
config object (configObject = fn({ defer: deferConfig, util: Util })) which
breaks downstream code; change this to call the factory and detect if the result
is a Promise (e.g. result && typeof result.then === 'function') and either await
it (so make the enclosing function async and assign configObject = await result)
or explicitly throw a clear error if async factories are unsupported; update
references to configObject/fn/deferConfig/Util and any callers of the enclosing
function to handle the async behavior accordingly.
- Around line 346-372: _iterate currently skips Promise elements inside arrays
because property.forEach(_iterate) never reaches the instanceof Promise check;
change the array branch in _iterate (where it checks property.constructor ===
Array) to iterate by index instead of forEach, and for each element do: if
element is a Promise, push a promise that assigns the resolved value back into
property[i] (e.g., promises.push(element.then(v => { property[i] = v })));
otherwise call _iterate on the element to recurse; keep the final await
Promise.all(promises) so those pushed resolvers write the resolved values back
into config; refer to _iterate, the array branch, promises array, and the final
Promise.all(promises).

In `@lib/util.js`:
- Line 328: The forEach callback is implicitly returning the value of
defer.resolve(), causing a lint warning; update the deferred.forEach callback so
it uses a block body that calls defer.resolve() without returning it (i.e.,
replace the concise arrow callback with a block-style arrow function that simply
invokes defer.resolve();), targeting the deferred array iteration where
deferred.forEach((defer) => defer.resolve()) is used to ensure no value is
returned from the callback.

In `@test/3-config/default.js`:
- Line 1: The file imports setTimeout from 'node:timers/promises' but never uses
it; remove the unused import to eliminate the dead dependency and any linter
warnings — delete the "const { setTimeout } = require('node:timers/promises');"
statement (or replace it with needed imports if other timers are required) so no
reference to setTimeout remains in the file.