In tsconfig.json make sure your library list has "dom" .
tsconfig.json should look more or less like this:
{ "compileOnSave": false, "compilerOptions": { "outDir": "./dist/out-tsc", "sourceMap": true, "declaration": false, "module": "commonjs", "moduleResolution": "node", "emitDecoratorMetadata": true, "experimentalDecorators": true, "lib": [ "es2016", "dom" ] } }
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