Remove legacy util/polyfill: Object.assign() (#8896)

Common since 2015

See: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign#browser_compatibility

Author: alxndrsn

bin/rollupPlugins.js

@@ -15,12 +15,10 @@ function rollupPlugins(nodeResolveConfig) {
     }),
     inject({
       exclude: [
-        '**/pouchdb-utils/src/assign.js',
         '**/pouchdb-collections/src/**'
       ],
       Map: ['pouchdb-collections', 'Map'],
       Set: ['pouchdb-collections', 'Set'],
-      'Object.assign': ['pouchdb-utils', 'assign']
     })
   ];
 }

packages/node_modules/pouchdb-utils/src/assign.js

@@ -7,7 +7,6 @@ import clone from './clone';
 import guardedConsole from './guardedConsole';
 import defaultBackOff from './defaultBackOff';
 import explainError from './explainError';
-import assign from './assign';
 import filterChange from './filterChange';
 import flatten from './flatten';
 import functionName from './functionName';
@@ -30,7 +29,6 @@ var uuid = v4; // mimic old import, only v4 is ever used elsewhere
 
 export {
   adapterFun,
-  assign,
   bulkGetShim,
   changesHandler,
   clone,