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Create a doc with extended information about HybridApp #56763

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cc: @Julesssss

Explanation of Change

Doc with extended information about HybridApp

Fixed Issues

$ N/A
PROPOSAL: N/A

Tests

  • Verify that no errors appear in the JS console

Offline tests

QA Steps

// TODO: These must be filled out, or the issue title must include "[No QA]."

  • Verify that no errors appear in the JS console

PR Author Checklist

  • I linked the correct issue in the ### Fixed Issues section above
  • I wrote clear testing steps that cover the changes made in this PR
    • I added steps for local testing in the Tests section
    • I added steps for the expected offline behavior in the Offline steps section
    • I added steps for Staging and/or Production testing in the QA steps section
    • I added steps to cover failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
    • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
    • I tested this PR with a High Traffic account against the staging or production API to ensure there are no regressions (e.g. long loading states that impact usability).
  • I included screenshots or videos for tests on all platforms
  • I ran the tests on all platforms & verified they passed on:
    • Android: Native
    • Android: mWeb Chrome
    • iOS: Native
    • iOS: mWeb Safari
    • MacOS: Chrome / Safari
    • MacOS: Desktop
  • I verified there are no console errors (if there's a console error not related to the PR, report it or open an issue for it to be fixed)
  • I followed proper code patterns (see Reviewing the code)
    • I verified that any callback methods that were added or modified are named for what the method does and never what callback they handle (i.e. toggleReport and not onIconClick)
    • I verified that comments were added to code that is not self explanatory
    • I verified that any new or modified comments were clear, correct English, and explained "why" the code was doing something instead of only explaining "what" the code was doing.
    • I verified any copy / text shown in the product is localized by adding it to src/languages/* files and using the translation method
      • If any non-english text was added/modified, I used JaimeGPT to get English > Spanish translation. I then posted it in #expensify-open-source and it was approved by an internal Expensify engineer. Link to Slack message:
    • I verified all numbers, amounts, dates and phone numbers shown in the product are using the localization methods
    • I verified any copy / text that was added to the app is grammatically correct in English. It adheres to proper capitalization guidelines (note: only the first word of header/labels should be capitalized), and is either coming verbatim from figma or has been approved by marketing (in order to get marketing approval, ask the Bug Zero team member to add the Waiting for copy label to the issue)
    • I verified proper file naming conventions were followed for any new files or renamed files. All non-platform specific files are named after what they export and are not named "index.js". All platform-specific files are named for the platform the code supports as outlined in the README.
    • I verified the JSDocs style guidelines (in STYLE.md) were followed
  • If a new code pattern is added I verified it was agreed to be used by multiple Expensify engineers
  • I followed the guidelines as stated in the Review Guidelines
  • I tested other components that can be impacted by my changes (i.e. if the PR modifies a shared library or component like Avatar, I verified the components using Avatar are working as expected)
  • I verified all code is DRY (the PR doesn't include any logic written more than once, with the exception of tests)
  • I verified any variables that can be defined as constants (ie. in CONST.ts or at the top of the file that uses the constant) are defined as such
  • I verified that if a function's arguments changed that all usages have also been updated correctly
  • If any new file was added I verified that:
    • The file has a description of what it does and/or why is needed at the top of the file if the code is not self explanatory
  • If a new CSS style is added I verified that:
    • A similar style doesn't already exist
    • The style can't be created with an existing StyleUtils function (i.e. StyleUtils.getBackgroundAndBorderStyle(theme.componentBG))
  • If the PR modifies code that runs when editing or sending messages, I tested and verified there is no unexpected behavior for all supported markdown - URLs, single line code, code blocks, quotes, headings, bold, strikethrough, and italic.
  • If the PR modifies a generic component, I tested and verified that those changes do not break usages of that component in the rest of the App (i.e. if a shared library or component like Avatar is modified, I verified that Avatar is working as expected in all cases)
  • If the PR modifies a component related to any of the existing Storybook stories, I tested and verified all stories for that component are still working as expected.
  • If the PR modifies a component or page that can be accessed by a direct deeplink, I verified that the code functions as expected when the deeplink is used - from a logged in and logged out account.
  • If the PR modifies the UI (e.g. new buttons, new UI components, changing the padding/spacing/sizing, moving components, etc) or modifies the form input styles:
    • I verified that all the inputs inside a form are aligned with each other.
    • I added Design label and/or tagged @Expensify/design so the design team can review the changes.
  • If a new page is added, I verified it's using the ScrollView component to make it scrollable when more elements are added to the page.
  • I added unit tests for any new feature or bug fix in this PR to help automatically prevent regressions in this user flow.
  • If the main branch was merged into this PR after a review, I tested again and verified the outcome was still expected according to the Test steps.

Screenshots/Videos

Android: Native
Android: mWeb Chrome
iOS: Native
iOS: mWeb Safari
MacOS: Chrome / Safari
MacOS: Desktop


It means that HybridApp is a **regular native application**, which has an additional screen that runs React Native.
# How is HybridApp built?
If you have access to the `Mobile-Expensify` repository, you are eligible to build HybridApp. The main difference between NewDot and HybridApp is that the native code is located in a different place. The native code is located under `./Mobile-Expensify/Android` and `./Mobile-Expensify/iOS
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Missing ` at the end of sentence

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and fullstop

Comment on lines +1 to +2
# What is HybridApp?
Every React Native mobile application needs native codebase with an entry point, known as `ReactRootView`. Depending on the platform the implementation differs. Nevertheless as a rule of thumb we can say that React Native just needs a **native** screen where JavaScript runtime can manipulate components and views.
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Great intro. A brief sentence explaining why we need HybridApp would be good for new contributors. Something like:

...HybridApp let us combine New Expensify and our classic app into a single mobile app for a seemless migration

# How do the scripts work?
While working on the HybridApp we've prepared a set of scripts to make the work with HybridApp easier. In general, the scripts `npm install`, `npm run clean`, `npm run android`, and `npm run ios` work on the following condition:

**If you have cloned HybridApp to `Mobile-Expensify` submodule, change the default behaviour of the scripts to build HybridApp instead of NewDot.**
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If you have cloned HybridApp to Mobile-Expensify submodule, the default behaviour of the scripts changes to build HybridApp instead of NewDot

It means that whenever we create a React Native application from scratch we instantiate it on a (very basic, bare) native codebase. However, we can always use a different, already existing codebase to run React Native. This is how we've built HybridApp - we've created a new `ReactRootView`, and taken all JavaScript code to run it in so-called OldDot.

It means that HybridApp is a **regular native application**, which has an additional screen that runs React Native.
# How is HybridApp built?
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If you have access to the Mobile-Expensify repository, you are eligible to build HybridApp

If you have access to the closed-source Mobile-Expensify repository, you are eligible to build HybridApp <-- might help explain to contributors that they do not, and cannot have access.

2. apply patches from `./patches`
3. cd to `Mobile-Expensify`
4. install `node_modules` for OldDot
5. apply patches from `./Mobile-Expensify/patches` -> for more info refer to [[#Patches]]
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Patches link not working yet


## `npm run clean`
- **Without access to HybridApp**:
1. clean all cache for NewDot by running `npx react-native clean-project-auto`
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  1. clean all cache for NewDot
  1. clean all caches for NewDot

- `./ios/Pods`
- `./ios/build`
- `./android/build`
- **With a cloned Mobile-Expensify submodule**:
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Are these folders cleared? Lets say the user built NewDot prior to gaining access to HybridApp

./ios/Pods
./ios/build
./android/build

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but if it is irrelevant, then lets not include this

# What is HybridApp?
Every React Native mobile application needs native codebase with an entry point, known as `ReactRootView`. Depending on the platform the implementation differs. Nevertheless as a rule of thumb we can say that React Native just needs a **native** screen where JavaScript runtime can manipulate components and views.

It means that whenever we create a React Native application from scratch we instantiate it on a (very basic, bare) native codebase. However, we can always use a different, already existing codebase to run React Native. This is how we've built HybridApp - we've created a new `ReactRootView`, and taken all JavaScript code to run it in so-called OldDot.
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and taken all JavaScript code to run it in so-called OldDot.

and taken all JavaScript code to run it within the existing mobile application (OldDot).

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Lets just clarify this, as it is the first usage of 'OldDot'


IMPORTANT: Please execute the following commands form the root of the project!
- `git submodule update --init`
- it initialises the submodule, and pulls the `Mobile-Expensify` code from the commit set in `Expesnify/App`.
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Expesnify > Expensify

- it initialises the submodule, and pulls the `Mobile-Expensify` code from the commit set in `Expesnify/App`.
- **IMPORTANT**: If you already have the `Mobile-Expensify` code, you don't need to run the command with `--init` flag.
- `git submodule update`
- it pulls the `Mobile-Expensify` code from the commit set in `Expesnify/App`.
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Same here: Expesnify

4. Check if you have a recent version of the `Mobile-Expensify` submodule
- if not, execute `git submodule update`, and rerun the build
5. Clean the cache by executing `npm run clean` (with proper platform flags)
If the problem still exists, please share the error on the open source channel
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If the problem still exists, please share the error in the #expensify-open-source channel.

4. Whenever you've updated `.env` files
This means that if you changed only React Native code, and didn't pull any changes, the rebuilt is probably not necessary. If something doesn't work, you can always restart the Metro bundler using the following command `npm run start --reset-cache`
### Should I rebuild HybridApp after bumping a `node_modules` library?
The `package-lock.json` file contains information about exact versions of `node_modules` that will be installed on your machine. If you've bumped a dependency on your PR you can easily see if you would need to rebuild the app. In this case go to the `./node_modules/<PACKAGE_NAME>`, and see if there are any Objective-C, Swift, Java, Kotlin or C++ files. Usually they are located in `ios` or `android` folders.
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If you've bumped a dependency on your PR you can easily see if you would need to rebuild the app. In this case go to the ./node_modules/<PACKAGE_NAME>, and see if there are any Objective-C, Swift, Java, Kotlin or C++ files.

If you've bumped a dependency on your PR you can easily check to see if you would need to rebuild the app by going to the ./node_modules/<PACKAGE_NAME>, and seeing if there are any Objective-C, Swift, Java, Kotlin or C++ files.

### Error: `undefined is not an object (evaluating 'Store.ReportHistory.bindCacheClearingEvents')`
This error indicates that YAPL JS (OldDot's JavaScript code) hasn't been built properly. In order to fix that, do the following:
1. cd to `Mobile-Expensify`
2. run `npm run grunt:build:shared`
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This should be fixed, but lets keep it just in case it breaks again 🤷

You can do a similar thing for NewDot if you know the path to the generated `.apk`. In this case you can reuse the `adb install` command providing a different path.

If you'd like to list all available `.apk`s to install them on your device you can run the following commands:
- **HybridApp**: `find Mobile-Expensify/Android/build/outputs -name "*.apk
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Missing ` at end of sentence

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This is looking good. It would be great to include a section on the .env files. Because internal devs struggle with this.

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