refactor: re-export objectMap from Endo

Author: turadg

packages/internal/src/utils.js

@@ -7,7 +7,7 @@ import { isPromise, makePromiseKit } from '@endo/promise-kit';
 import { makeQueue } from '@endo/stream';
 import { asyncGenerate, makeSet } from 'jessie.js';
 
-const { entries, fromEntries, keys, values } = Object;
+const { fromEntries, keys, values } = Object;
 const { ownKeys } = Reflect;
 
 const { details: X, quote: q, Fail } = assert;
@@ -42,51 +42,7 @@ export const fromUniqueEntries = allEntries => {
 };
 harden(fromUniqueEntries);
 
-/**
- * By analogy with how `Array.prototype.map` will map the elements of
- * an array to transformed elements of an array of the same shape,
- * `objectMap` will do likewise for the string-named own enumerable
- * properties of an object.
- *
- * Typical usage applies `objectMap` to a CopyRecord, i.e.,
- * an object for which `passStyleOf(original) === 'copyRecord'`. For these,
- * none of the following edge cases arise. The result will be a CopyRecord
- * with exactly the same property names, whose values are the mapped form of
- * the original's values.
- *
- * When the original is not a CopyRecord, some edge cases to be aware of
- *    * No matter how mutable the original object, the returned object is
- *      hardened.
- *    * Only the string-named enumerable own properties of the original
- *      are mapped. All other properties are ignored.
- *    * If any of the original properties were accessors, `Object.entries`
- *      will cause its `getter` to be called and will use the resulting
- *      value.
- *    * No matter whether the original property was an accessor, writable,
- *      or configurable, all the properties of the returned object will be
- *      non-writable, non-configurable, data properties.
- *    * No matter what the original object may have inherited from, and
- *      no matter whether it was a special kind of object such as an array,
- *      the returned object will always be a plain object inheriting directly
- *      from `Object.prototype` and whose state is only these new mapped
- *      own properties.
- *
- * With these differences, even if the original object was not a CopyRecord,
- * if all the mapped values are Passable, then the returned object will be
- * a CopyRecord.
- *
- * @template {Record<string, any>} O
- * @param {O} original
- * @template R map result
- * @param {(value: O[keyof O], key: keyof O) => R} mapFn
- * @returns {{ [P in keyof O]: R}}
- */
-export const objectMap = (original, mapFn) => {
-  const ents = entries(original);
-  const mapEnts = ents.map(([k, v]) => [k, mapFn(v, k)]);
-  return harden(fromEntries(mapEnts));
-};
-harden(objectMap);
+export { objectMap } from '@endo/patterns';
 
 /**
  * @param {Array<string | symbol>} leftNames