@egjs/grid/tsconfig.declaration.json

{
  "extends": "./tsconfig",
  "compilerOptions": {
    "removeComments": true,
    "declaration": true,
    "emitDeclarationOnly": true,
    "declarationDir": "declaration",
    "strictNullChecks": false,
  },
  "include": [
    "./src/**/*.ts",
  ]
}