tsconfig.json

{
  "compileOnSave": false,
  "compilerOptions": {
    "baseUrl": "./",
    "paths": {
      "@zeppelin/*": [
        "./src/zeppelin_app/*",
        "./src/environments/*"
      ],
      "@zeppelin/helium": [
        "./dist/zeppelin-helium"
      ],
      "@zeppelin/helium/*": [
        "./dist/zeppelin-helium/*"
      ],
      "@zeppelin/visualization": [
        "dist/zeppelin-visualization"
      ],
      "@zeppelin/visualization/*": [
        "dist/zeppelin-visualization/*"
      ],
      "@zeppelin/sdk": [
        "dist/zeppelin-sdk"
      ],
      "@zeppelin/sdk/*": [
        "dist/zeppelin-sdk/*"
      ],
      "zeppelin-sdk": [
        "dist/zeppelin-sdk/zeppelin-sdk",
        "dist/zeppelin-sdk"
      ],
      "zeppelin-visualization": [
        "dist/zeppelin-visualization/zeppelin-visualization",
        "dist/zeppelin-visualization"
      ]
    },
    "outDir": "./dist/out-tsc",
    "module": "esnext", // add this line
    "sourceMap": true,
    "declaration": false,
    "downlevelIteration": true,
    "allowJs": true,
    "experimentalDecorators": true,
    "moduleResolution": "node",
    "importHelpers": true,
    "target": "es2015",
    "typeRoots": [
      "node_modules/@types"
    ],
    "lib": [
      "es2020",
      "dom"
    ]
  },
  "angularCompilerOptions": {
    "fullTemplateTypeCheck": true,
    "strictInjectionParameters": true
  }
}