ruffle/web/packages/extension/tsconfig.json

{
    "extends": "@tsconfig/strictest/tsconfig.json",
    "compilerOptions": {
        "module": "es2020",
        "moduleResolution": "node",
        "target": "es2017",
        "rootDir": "src",
    },
    "include": ["src/**/*"],
    "references": [{ "path": "../core" }],
}