ruffle/web/packages/core/tsconfig.json

{
    "extends": "@tsconfig/recommended/tsconfig.json",
    "compilerOptions": {
        "target": "es2017",
        "module": "es2020",
        "moduleResolution": "node",
        "importsNotUsedAsValues": "error",
        "outDir": "pkg",
    },
    "include": ["src/**/*"],
}