Consolidate invert modules.

.internal/baseInverter.js

@@ -1,21 +0,0 @@
-import baseForOwn from './baseForOwn.js';
-
-/**
- * The base implementation of `invert` and `invertBy` which inverts
- * `object` with values transformed by `iteratee` and set by `setter`.
- *
- * @private
- * @param {Object} object The object to iterate over.
- * @param {Function} setter The function to set `accumulator` values.
- * @param {Function} iteratee The iteratee to transform values.
- * @param {Object} accumulator The initial inverted object.
- * @returns {Function} Returns `accumulator`.
- */
-function baseInverter(object, setter, iteratee, accumulator) {
-  baseForOwn(object, (value, key, object) => {
-    setter(accumulator, iteratee(value), key, object);
-  });
-  return accumulator;
-}
-
-export default baseInverter;

.internal/createInverter.js

@@ -1,14 +0,0 @@
-import baseInverter from './.internal/baseInverter.js';
-
-/**
- * Creates a function like `invertBy`.
- *
- * @private
- * @param {Function} setter The function to set accumulator values.
- * @returns {Function} Returns the new inverter function.
- */
-function createInverter(setter) {
-  return (object, iteratee) => baseInverter(object, setter, iteratee, {});
-}
-
-export default createInverter;