build prod issue for angular 13

[caohothang]

DevTools failed to load source map: Could not load content for https://xxxx/angular-notifier.mjs.map not found
why it using fesm2020 while i using es2020

/* To learn more about this file see: https://angular.io/config/tsconfig. /
{
"extends": "./tsconfig.base.json",
"compilerOptions": {
"outDir": "./out-tsc/app",
"sourceMap": true,
"declaration": false,
"downlevelIteration": true,
"experimentalDecorators": true,
"moduleResolution": "node",
"importHelpers": true,
"target": "es2020",
"module": "esnext",
"useDefineForClassFields": false,
"lib": [
"es2019",
"dom"
],
// "types": ["chrome"]
},
"files": [
"src/main.ts",
"src/polyfills.ts"
],
"include": [
"src/**/.d.ts"
]
}