blockly/client/tsconfig.json

{
  "compilerOptions": {
    "baseUrl": "./",
    "outDir": "dist",
    "declaration": true,
    "declarationMap": true,
    "module": "ES2015",
    "moduleResolution": "node",
    "target": "ES2015",
    "strict": true,
    "allowSyntheticDefaultImports": true
  }
}