Use ResizeObserver polyfill

package.json

@@ -33,7 +33,6 @@
     "@angular/platform-browser": "~9.1.7",
     "@angular/platform-browser-dynamic": "~9.1.7",
     "@angular/router": "~9.1.7",
-    "@types/resize-observer-browser": "^0.1.4",
     "echarts": "^4.7.0",
     "echarts-gl": "^1.1.1",
     "ng-zorro-antd": "^9.1.2",
@@ -68,6 +67,7 @@
     "prismjs": "^1.20.0",
     "protractor": "~5.4.3",
     "raw-loader": "^4.0.1",
+    "resize-observer-polyfill": "^1.5.1",
     "ts-node": "~8.3.0",
     "tslint": "~5.18.0",
     "typescript": "~3.8.3"

projects/ngx-echarts/src/lib/ngx-echarts.directive.ts

@@ -13,6 +13,7 @@ import {
   Output,
   SimpleChanges,
 } from '@angular/core';
+import ResizeObserver from 'resize-observer-polyfill';
 import { Observable } from 'rxjs';
 import { switchMap } from 'rxjs/operators';
 import { ChangeFilter } from './change-filter';

projects/ngx-echarts/tsconfig.lib.json

@@ -5,12 +5,7 @@
     "target": "es2015",
     "declaration": true,
     "inlineSources": true,
-    "typeRoots": [
-      "node_modules/@types"
-    ],
-    "types": [
-      "resize-observer-browser"
-    ],
+    "types": [],
     "lib": [
       "dom",
       "es2018"