pxt-calliope/fieldeditors/tsconfig.json

{
    "compilerOptions": {
        "target": "es2017",
        "noImplicitAny": false,
        "noImplicitReturns": true,
        "module": "commonjs",
        "outDir": "../built/fieldeditors",
        "rootDir": ".",
        "newLine": "LF",
        "sourceMap": false,
        "allowSyntheticDefaultImports": true,
        "declaration": true
    }
}