useTranslation (hook)

What it does
It gets the t function and i18n instance inside your functional component.
import React from 'react';
import { useTranslation } from 'react-i18next';
​
export function MyComponent() {
  const { t, i18n } = useTranslation();
  // or const [t, i18n] = useTranslation();
  
  return <p>{t('my translated text')}</p>
}
While you most time only need the t function to translate your content you also get the i18n instance to eg. change the language.
i18n.changeLanguage('en-US');
The useTranslation hook will trigger a Suspense if not ready (eg. pending load of translation files). You can set useSuspense to false if prefer not using Suspense.
When to use?
Use the useTranslation hook inside your functional components to access the translation function or i18n instance. 
useTranslation params
Loading namespaces
// load a specific namespace
// the t function will be set to that namespace as default
const { t, i18n } = useTranslation('ns1');
t('key'); // will be looked up from namespace ns1
​
// load multiple namespaces
// the t function will be set to first namespace as default
const { t, i18n } = useTranslation(['ns1', 'ns2', 'ns3']);
t('key'); // will be looked up from namespace ns1
t('ns2:key'); // will be looked up from namespace ns2
Overriding the i18next instance
// passing in an i18n instance
// use only if you do not like the default instance
// set by i18next.use(initReactI18next) or the I18nextProvider
import i18n from './i18n';
const { t, i18n } = useTranslation('ns1', { i18n });
Not using Suspense
// additional ready will state if translations are loaded or not
const { t, i18n, ready } = useTranslation('ns1', { useSuspense: false });
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