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HACKING.md

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Hacking

Here are some internal info that might be useful for new contributors trying to understand the codebase and how to get some work done.

Toolchain

To work on this project, you will just need Node 16+ (and Docker to run tests). We use npm to manage dependencies, and prettier to lint our code.

Scripts

These are the runnable scripts with npm run:

General:

  • run-dev: Run the CLI (with ts-node). Use -- to pass arguments to the CLI rather than NPM:
    npm run run-dev -- extract print --extractor react src/**/*.tsx
  • build: Build the CLI.
  • prettier: Run Prettier.
  • lint: Run Prettier but does not update files (report-only).
  • schema: Generate REST API schemas (see REST Client)

Tests:

  • test: Run all tests (Unit & E2E). Will start (and stop) the E2E Tolgee test instance
  • test:unit: Run unit tests only.
  • test:e2e: Run e2e tests only. Will start (and stop) the E2E Tolgee test instance

E2E test instance:

  • tolgee:start: Start the E2E testing instance. Will be available on port 22222.
  • tolgee:stop: Stop the E2E testing instance.

Code & internals overview

Command parsing

The CLI uses commander.js to handle the whole command parsing & routing logic. As the way we deal with arguments is more complex than what the library can do by itself, we have some extra validation logic.

Config loading & validation

We use cosmiconfig to handle the loading of the .tolgeerc file. There is also a module that manages the authentication token store (~/.tolgee/authentication.json). These modules can be found in src/config.

The .tolgeerc file is loaded at program startup, and the tokens (which depend on options) are loaded before our custom validation logic.

REST Client

The REST Client to interact with the Tolgee API is a light abstraction that uses types generated from our OpenAPI specifications. Feel free to add new methods in the client if you need them. It can be found in src/config.

Extractor

The Tolgee Extractor/Code Analyzer is one of the biggest components of the CLI. Tolgee uses TextMate grammars to parse source code files, and then uses states machines powered by XState to perform the actual extraction.

Adding new TextMate grammars

To add new TextMate grammars, do not do it manually! Modify the scripts/grammars.js file following these steps:

  • Add the URL to the grammar file to the Grammars dictionary.
  • Add applicable licensing information to the GrammarsLicense dictionary.
  • If you need to transform the TextMate grammar:
    • In the Transformers object, add a function that'll receive the raw TextMate grammar
    • Make sure to add a comment to the file stating the file is modified, a link to the original, and a reason for the transformation
    • Hint: Look at how the transformation for TypeScriptReact is done.
  • In src/extractor/tokenizer.ts:
    • Add a new entry to the Grammar enum
    • Add a new entry to the GrammarFiles dict
    • Add new cases in the extnameToGrammar function

Feel free to join the Slack channel if you have questions!

Happy hacking 🐀