{
    "compilerOptions": {
        "lib": [
            "es2019", "dom", "dom.iterable"
        ],
        "module": "es2015",
        "noFallthroughCasesInSwitch": true,
        "noImplicitReturns": true,
        "noUnusedLocals": true,
        "noUnusedParameters": true,
        "outDir": "../out/viewer",
        "sourceMap": true,
        "strict": true,
        "target": "es2019",
        "typeRoots": []
    }
}

{
    "compilerOptions": {
        "lib": [
            "es2021", "dom", "dom.iterable"
        ],
        "module": "es2015",
        "noFallthroughCasesInSwitch": true,
        "noImplicitReturns": true,
        "noUnusedLocals": true,
        "noUnusedParameters": true,
        "outDir": "../out/viewer",
        "sourceMap": true,
        "strict": true,
        "target": "es2021",
        "typeRoots": []
    }
}

Set "target": "es2021" for viewer
Set "target": "es2021" for viewer
