tsconfig.json
{
"compilerOptions": {
"preserveConstEnums": true,
"strictNullChecks": true,
"sourceMap": true,
"allowJs": true,
"target": "es5",
"outDir": ".build",
"moduleResolution": "node",
"lib": ["es2015"],
"rootDir": "./",
"esModuleInterop": true,
"typeRoots": ["./node_modules/@types", "./types/"]
}
}