报错现象：

鼠标悬浮在红色报错处，出现报错提示：

解决方法：

在“tsconfig.app.json” 文件的 “compilerOptions” 选项下添加：

 "lib": ["es5", "es6", "es2015", "es7", "es2016", "es2017", "es2018", "es2019", "es2020", "es2021", "es2022", "esnext", "dom", "dom.iterable", "webworker", "webworker.importscripts", "webworker.iterable", "scripthost", "es2015.core", "es2015.collection", "es2015.generator", "es2015.iterable", "es2015.promise", "es2015.proxy", "es2015.reflect", "es2015.symbol", "es2015.symbol.wellknown", "es2016.array.include", "es2017.object", "es2017.sharedmemory", "es2017.string", "es2017.intl", "es2017.typedarrays", "es2018.asyncgenerator", "es2018.asynciterable", "es2018.intl", "es2018.promise", "es2018.regexp", "es2019.array", "es2019.object", "es2019.string", "es2019.symbol", "es2019.intl", "es2020.bigint", "es2020.date", "es2020.promise", "es2020.sharedmemory", "es2020.string", "es2020.symbol.wellknown", "es2020.intl", "es2020.number", "es2021.promise", "es2021.string", "es2021.weakref", "es2021.intl", "es2022.array", "es2022.error", "es2022.intl", "es2022.object", "es2022.sharedmemory", "es2022.string", "esnext.array", "esnext.symbol", "esnext.asynciterable", "esnext.intl", "esnext.bigint", "esnext.string", "esnext.promise", "esnext.weakref"],

如图所示：

添加好后保存文件，然后关闭 vscode 重新打开 vscode，报错消失