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@betomorrow/i18n-typegen

v2.2.1

Published

Generate TS type for your translations keys and interpolation values

Downloads

135

Readme

i18n-typegen

Generate TS type for your translations keys and interpolate values

Features

  • 🛠 TypeScript Definition Generator: Generate .d.ts for your i18n function. Provide keys, pluralization and interpolation validation
  • 🧘 Not intrusive: This is a type-only code generator. You are free to use any i18n solutions, including your own. The default works well with i18n-js.

Usage

Installation

npm install --save-dev @betomorrow/i18n-typegen

Configuration

# Generate default config file
npx i18n-typegen init
# Generate your type for keys and interpolations
npx i18n-typegen codegen

Example of What it Does

Given the following JSON input:

{
  "greeting": "Hello {{firstName}} {{familyName}}!",
  "duration.day.one": "1 day",
  "duration.day.other": "{{count}} days",
  "duration.day.zero": "0 day"
}

This package generates the following types:

type Translations = {
  greeting: { firstName: string; familyName: string };
  "duration.day": { count: number };
  goodbye: undefined;
};
export { TranslationFunction, TranslationFunctionArgs, TranslationKeys };

Use these types to type your own i18n function:

import { TranslationFunction } from "translations";

const translate: TranslationFunction = () => {};

translate("greeting", { firstName: "Harry", familyName: "Potter" }); // OK

translate("greeting", { firstName: "Henry" }); // Error
/**
    Property 'familyName' is missing in type '{ firstName: string }' but required in type '{ firstName:  string; familyName: string; }'.ts(2345)
    */

translate("goodbye"); // OK

Configuration file

{
  "input": {
    "format": "nested",
    "path": "./input/default.json"
  },
  "output": {
    "path": "./output/default.d.ts"
  },
  "rules": [
    {
      "//": "Add pluralization placeholders",
      "condition": { "keyEndsWith": ["zero", "one", "other"] },
      "transformer": {
        "addPlaceholder": { "name": "count", "type": ["number"] },
        "removeLastPart": true
      }
    },
    {
      "//": "Add interpolation values for matched placeholders",
      "condition": { "placeholderPattern": { "prefix": "{{", "suffix": "}}" } },
      "transformer": {
        "addMatchedPlaceholder": { "type": ["string", "number"] }
      }
    }
  ],
  "extra": {
    "prettierIgnore": true,
    "eslintDisablePrettier": false
  }
}
  • input format support JSON translations file with
    • flatten keys like home.header.greeting
    • nested scoped dictionnaries: { home: { header: { greeting: "hello" } } }
  • extra de-opt generated files from prettier or eslint prettier rule to comply with specific configurations.
    • prettierIgnore add // prettier-ignore in generated file.
    • eslintDisablePrettier add /* eslint-disable prettier/prettier */ in generated file.

Recommended Toolbox

Example of implementation

See docs for complete usage of type generation with some i18n implementations

Contribution

Contributions, bug reports, feature requests, or pull requests, are very appreciated. However, please note the following:

  • Bug Reports and Feature Requests: If you encounter a bug or have a feature request, please open an issue. Provide clear details about the problem or the requested feature.

  • Pull Requests: Feel free to submit pull requests for bug fixes or new features.

  • Limited Support: This project is shared as-is with limited ongoing support. While contributions are welcome, bear in mind that the primary focus is on personal usage. If urgent, consider forking the project.