tsconfig.json

{
    "include": [
        "src",
        "test",
        "types"
    ],
    "exclude": [
        "node_modules"
    ],
    "extends": "@snowpack/app-scripts-react/tsconfig.base.json",
    "compilerOptions": {
        // You can't currently define paths in your 'extends' config,
        // so we have to set 'baseUrl' & 'paths' here.
        // Don't change these unless you know what you're doing.
        // See: https://github.com/microsoft/TypeScript/issues/25430
        "baseUrl": "./",
        /* more strict checking for errors that per-file transpilers like `esbuild` would crash */
        "isolatedModules": true,
        "paths": {
            "*": [
                "web_modules/.types/*"
            ],
            "~/*": [
                "./src/*"
            ]
        }
        // Feel free to add/edit new config options below:
        // ...
    }
}