Lingui extract doesn't handle i18n._ strings

Describe the bug Lingui extract ignores i18n._

To Reproduce

import { i18n } from "@lingui/core"

export default function App() {
   return i18n._('This should be translated!')
}

Expected behavior The text should appear in the .po file

Additional context I review the source code and I found the function isI18nMethod defined at babel-plugin-extract-messages but it looks like is never used.

• jsLingui version 3.12.1
• Babel version 7.16.0
• Your Babel config (.babelrc): .babelrc { "presets": [ "@babel/preset-env", "@babel/preset-react", "@lingui/babel-preset-react", "@babel/preset-typescript" ] }
• Lingui config (.linguirc) .linguirc { "locales": ["en", "es", "de"], "sourceLocale": "en", "catalogs": [{ "path": "<rootDir>/src/app-react/locales/{locale}/translations", "include": ["<rootDir>/src/app-react"], "exclude": ["**/node_modules/**"] }], "format": "po-gettext", "compileNamespace": "ts" }

[tannerlyons]

@juanluispaz , you can use this workaround:

import { i18n } from "@lingui/core"

export default function App() {
   return i18n._(/*i18n*/ "This should be translated!");
}

The extractor uses /*i18n*/ as a marker for things to extract.

[borjaMiralles]

I can confirm that this workaround works, thanks @tannerlyons