Object passed dynamically to React component gives Typescript error

Question

I'm having a typescript error when trying to pass some dynamic values to a React component:

Property 'title' does not exist on type 'string'.ts(2339)

 import { useTranslation } from "react-i18next";
import OurMissionList from "./SubModules/our-mission-list.component";

export const OurMission = () => {
  const { t } = useTranslation();
  const section = t(`ourmission:section`, {
    returnObjects: true
  });

  console.log("section", section);

  return (
    <div className="our-mission content">
      <div className="section_info_wrapper container">
        <div className="info_text">
          <h2>{section.title}</h2>
          <p className="main_text"> {section.text}</p>
          <h3>{section.subtitle}</h3>
          <OurMissionList />
        </div>
      </div>
    </div>
  );
};
export default OurMission;

The console.log of section is:

    {
    "title": "Deliver the best possible experience",
    "text": "To be the first choice of consumers and businesses by providing them with the best possible experience in telecommunications, entertainment, news media and culture, while being a leader in each of our lines of business.",
    "subtitle": "Key behaviours",
    "list": [
        {
            "name": "Performance",
            "pos": "Give your best effort at all times and dare to press for success."
        },
        {
            "name": "Innovation",
            "pos": "Come up with new ideas to solve the problems at hand and set us apart."
        },
        {
            "name": "Customer focus",
            "pos": "Be fully engaged, listen and demonstrate professionalism in order to anticipate and meet the wants and needs of our customers and business partners."
        },
        {
            "name": "Teamwork",
            "pos": "Provide mutual support and take advantage of each colleague’s strengths and ideas."
        },
        {
            "name": "Agility",
            "pos": "Be flexible and ready to adapt to circunstances."
        }
    ]
}

Anybody knows how to fix it? Thanks!

console.log(section.title); Deliver the best possible experience — analuspi
– analuspi, Commented Nov 20, 2021 at 21:58

DustInComp · Accepted Answer · 2021-11-20 22:26:13Z

1

Looks like you'll have to add a declaration file that extends some interfaces from the react_i18next package with types gathered from your translation JSON files for the t function to return the proper types.

This is explained here: https://react.i18next.com/latest/typescript#create-a-declaration-file

In short:

// react-i18next.d.ts
import 'react-i18next';
// import all namespaces (for the default language, only)
import ns1 from 'locales/en/ns1.json';
import ns2 from 'locales/en/ns2.json';

// react-i18next versions lower than 11.11.0
declare module 'react-i18next' {
  interface Resources {
    ns1: typeof ns1;
    ns2: typeof ns2;
  }
}

// react-i18next versions higher than 11.11.0
declare module 'react-i18next' {
  interface CustomTypeOptions {
    // custom namespace type if you changed it
    defaultNS: 'ns1';
    resources: {
      ns1: typeof ns1;
      ns2: typeof ns2;
    };
  }
}

edited Nov 20, 2021 at 22:26

answered Nov 20, 2021 at 22:14

DustInComp

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