Typescript not flagging an error for an object being declared without a type

I am encountering an issue with my tsconfig.json file:

{
  "compilerOptions": {
    "allowJs": true,
    "allowSyntheticDefaultImports": true,
    "baseUrl": "src",
    "isolatedModules": true,
    "jsx": "preserve",
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "lib": ["dom", "dom.iterable", "esnext"],
    "module": "esnext",
    "moduleResolution": "node",
    "noEmit": true,
    "noImplicitAny": true,
    "noUnusedLocals": true,
    "resolveJsonModule": true,
    "skipLibCheck": true,
    "strict": true,
    "strictFunctionTypes": true,
    "strictNullChecks": true,
    "target": "es5",
    "types": ["node", "jest"]
  },
  "include": ["./src/**/*.ts", "./src/**/*.tsx"],
  "plugins": [
    {
      "name": "typescript-tslint-plugin"
    }
  ]
}

Even though I have set noImplicitAny, TypeScript is inferring the type for a specific object in my code:

export const routes = [
    {
        exact: true,
        id: "home",
        main: {
            component: Home,
        },
        path: "/",
    },
    {
        id: "audit-report",
        main: {
            component: AuditReport,
        },
        path: "/reports/audit",
    },
];

I was expecting an error to be flagged for this particular object since it lacks explicit typing.

Answer №1

noImplictAny only triggers errors when type is not explicitly specified AND typescript assumes any due to lack of additional information about the variable. In your scenario, typescript can easily infer the type for routes even if it's left unspecified. Using it incorrectly (such as accessing non-existent properties) will result in an error, ensuring type safety according to the compiler.

I generally suggest allowing the compiler to infer types when possible, as typing everything explicitly can add excess noise and provide limited value (you can always hover to see inferred types if necessary).

If you absolutely insist on enforcing explicit type declarations for all variables, you can utilize this tslint rule.

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