feat: Remove module federation

We decided not to move forward with module federation during the Mini
Summit, so all related functionality is removed here.

Author: arbrandes

README.md

@@ -18,89 +18,24 @@ It will replace:
 
 The new frontend framework will completely take over responsibility for the functionality of those libraries, and will also include a "shell" application.
 
-It will enable Open edX frontends to be loaded as "module plugins" via Webpack module federation, or as "direct plugins" as part of a single, unified application.   It will also support creation of "project" repositories as a central place to check in an Open edX instance's frontend customizations and extensions.
+It will enable Open edX frontends to be loaded as "direct plugins" as part of a single, unified application.   It will also support creation of "project" repositories as a central place to check in an Open edX instance's frontend customizations and extensions.
 
 ## Further reading
 
-- [Frontend Glossary](./docs/frontend-glossary.md)
 - [OEP-65: Frontend composability](https://open-edx-proposals.readthedocs.io/en/latest/architectural-decisions/oep-0065-arch-frontend-composability.html)
 - [ADR 0001: Create a unified platform library](https://github.com/openedx/open-edx-proposals/pull/598)
 - [Discourse discussion on frontend projects](https://discuss.openedx.org/t/oep-65-adjacent-a-frontend-architecture-vision/13223)
 
 ## Communication
 
-This project uses the [#module-federation](https://openedx.slack.com/archives/C06HRLTP3E0) channel in Open edX Slack.
-
 You can follow ongoing progress on the project's [Github project board](https://github.com/orgs/openedx/projects/65/views/1).
 
-Feel free to reach out to David Joy ([Github](https://github.com/davidjoy), [Slack](https://openedx.slack.com/team/UFM4FEN0J)) with any questions.
+Feel free to reach out in [#wg-frontend on Slack](https://openedx.slack.com/archives/C04BM6YC7A6) with any questions.
 
 ## Development
 
 This library is under development and has not yet been published to npm.
 
-Its functionality can be tested with a few other companion repositories that have been built to work with it:
-
-- https://github.com/davidjoy/frontend-app-base-test
-- https://github.com/davidjoy/frontend-project-test
-- https://github.com/davidjoy/frontend-project-module-test
-
-To start the whole thing together:
-
-- Check out https://github.com/davidjoy/frontend-base and the above three repositories as siblings.
-- Run `npm install` on all of them.
-- Run `npm run temp:refresh-all` in frontend-base.
-- Run `npm run pack frontend-project-test` in frontend-app-base-test.
-- Run `npm run pack frontend-project-module-test` in frontend-app-base-test.
-- You'll need 3 terminal windows.
-  - Run `npm run dev` in `frontend-project-test`
-  - Run `npm run dev:module` in `frontend-app-base-test`
-  - Run `npm run dev:module` in `frontend-project-module-test
-- Visit `http://localhost:8080` in your browser to see the unified site.
-
-What this site is showing you:
-
-- The shell (header, footer, app initialization) is being loaded from `frontend-base` through `frontend-project-test`.  The `site.config.dev.tsx` file in `frontend-project-test` has configured the site.
-- `ModuleOne` from `frontend-app-base-test` is being loaded _through_ the `site.config.dev.tsx` file in `frontend-project-test` as an imported dependency.
-- `ModuleTwo` is being loaded at runtime from the module federation dev server in `frontend-app-base-test`.
-- `ModuleThree` is being loaded at runtime from the module federation dev server in `frontend-project-module-test`.
-
-Read below for more details about the companion repositories.
-
-### frontend-app-base-test
-
-https://github.com/davidjoy/frontend-app-base-test
-
-This is an "MFE" repository with three modules in it which can be loaded into a shell.  It can be tested in a few different ways.
-
-- `npm run dev:module` - This will run a dev server and build the app as modules for module federation.
-- `npm run dev` - This will run the a dev server and build the app as part of a shell with three imported modules.
-- `npm run pack <frontend-project-test|frontend-project-module-test>` - this will package the library into an npm compatible `.tgz` file for use with the project repositories below.
-
-### frontend-project-test
-
-This is a "project" repository, which is a new thing.  A project is where you put your customizations to the frontend.
-
-The `frontend-project-test` project has been configured in its `site.config.dev.tsx` file to load the three modules from `frontend-app-base-test` in three different ways:
-
-- Module One is loaded as an imported app, using frontend-app-base-test as a dependency of the project installed via `npm run pack` above.
-- Module Two is loaded via module federation from the `npm run dev:module` dev server in `frontend-app-base-test`
-- Module Three is loaded via module federation from the `npm run dev:module` dev server in `frontend-project-module-test`.
-
-It can be tested with:
-
-- `npm run dev` - This will start up a dev server with the new shell application and load the three modules into it via the methods described above.
-
-### frontend-project-module-test
-
-This is also a "project" repository, demonstrating that you can use module federation with a released library version of `frontend-app-base-test`, rather than by cloning the app and running a dev server in it.  This is more appropriate for customizations of the app because you can check all your customizations in to the project, rather than needing to copy/paste them into the frontend-app-* repository at build time, which is awkward.
-
-It can be tested with:
-
-- `npm run dev:module` - This starts up a dev server that serves the modules from `frontend-app-base-test` for module federation, the same as running `npm run dev:module` in the `frontend-app-base-test` repository itself.
-
-It's worth noting that this project has a new type of file: `build.dev.config.js` which is necessary to configure webpack to understand what modules it should be packaging for module federation.  We can't use `site.config.dev.tsx` for this purpose, since that's runtime code.
-
 ## Migrating an MFE to `frontend-base` (Work in progress)
 
 See the [Frontend App Migration How To](./docs/how_tos/migrate-frontend-app.md).
@@ -121,19 +56,18 @@ Then move the files out of the way (move src to some other sub-dir, mostly) to m
 
 ### Latest repository merges
 
-- frontend-component-header - Up to date as of 9/12/2024
-- frontend-component-footer - Up to date as of 9/12/2024
 - frontend-build            - Up to date as of 9/12/2024
-
 - frontend-platform         - Up to date as of 9/13/2024
 - frontend-plugin-framework - Up to date as of 9/13/2024
+- frontend-component-header - Up to date as of 9/12/2024
+- frontend-component-footer - Up to date as of 9/12/2024
 
 # Other notable changes
 
 - Cease using `AUTHN_MINIMAL_HEADER`, replace it with an actual minimal header.
 - No more using `process.env` in runtime code.
 - Removed dotenv.  Use site.config.tsx.
-- Removed Purge CSS.  We do not believe that Purge CSS works properly with Paragon in general, and it is also fundamentally incompatible with module federation as an architecture.
+- Removed Purge CSS.  We do not believe that Purge CSS works properly with Paragon in general.
 - Removed `ensureConfig` function.  This sort of type safety should happen with TypeScript types in the site config file.
 - Removed `ensureDefinedConfig` function.  Similar to ensureConfig, this sort of type safety should be handled by TypeScript.
 - A number of site config variables now have sensible defaults:
@@ -188,7 +122,6 @@ MFE_CONFIG = {
 """
     )
 )
-
 ```
 
 Customizing the MFE config API:

docs/decisions/0004-frontend-library-migration-to-frontend-base.md

@@ -24,7 +24,7 @@ We will move the code from these libraries into `frontend-base`.  We decided we
 
 ### Migration Order
 
-We chose to move `frontend-build` first as the foundation upon which all the others will be built.  A modified version of `frontend-build` will be used to build the shell and provide build scripts to the frontend apps which support webpack module federation, amongst other things.
+We chose to move `frontend-build` first as the foundation upon which all the others will be built.  A modified version of `frontend-build` will be used to build the shell, amongst other things.
 
 Following frontend build, we will move `frontend-platform` and validate that this repository can act as a replacement for `frontend-build` and `frontend-platform` together. At this point, micro-frontend repositories could be migrated to use this library instead of `frontend-build` and `frontend-platform`.
 

docs/how_tos/migrate-frontend-app.md

@@ -112,9 +112,7 @@ With the exception of any custom scripts, replace the `scripts` section of your
   "scripts": {
     "build": "PORT=YOUR_PORT openedx build",
     "build:legacy": "openedx build:legacy", // TODO: Does this target exist?
-    "build:module": "PORT=YOUR_PORT openedx build:module",
     "dev": "PORT=YOUR_PORT openedx dev",
-    "dev:module": "PORT=YOUR_PORT openedx dev:module",
     "dev:legacy": "PORT=YOUR_PORT openedx dev:legacy",
     "i18n_extract": "openedx formatjs extract",
     "lint": "openedx lint .",
@@ -136,11 +134,10 @@ With the exception of any custom scripts, replace the `scripts` section of your
 
 ## 5. Other package.json edits
 
-- `main` and `module`
+- `main`
 
 ```diff
 + "main": "src/index.ts",
-+ "module": "src/index.ts",
 ```
 
 - `sideEffects`
@@ -156,30 +153,6 @@ This means that the code from the library can be safely tree-shaken by webpack.
 
 // TODO: Maybe put scss and css files in side effects.  They have side effects and need to be excluded so they get bundled.
 
-- `config`
-
-You must add a "config" section to package.json that describes the modules that the library exports.  This includes a camelCase `name` for the remote that hosts all your packages.  This name must be unique across all the libraries in a frontend, and so including your organization name is encouraged. For an Open edX default library called `frontend-app-my-library`, a good name would be `openedxMyLibrary`.
-
-The config block must also include an `exposes` configuration that describes your modules.
-
-```diff
-+ "config": {
-+   "name": "openedxMyLibrary",
-+   "exposes": {
-+     "./ModuleOne": "./src/module-one",
-+     "./ModuleTwo": "./src/module-two",
-+     "./ModuleThree": "./src/module-three"
-+   }
-+ },
-```
-
-If you used the "exports" field in package.json it changes the way importing/requiring/TS/node works and everything starts to break.
-
-The entries in `exposes` are:
-
-1. A key that is compatible with the [Package entry points](https://nodejs.org/api/packages.html#package-entry-points) specification.  Generally the name of your module prefixed with `./`.
-2. The actual path to the module in your source code.  In the above example, `./ModuleOne` is the name that module federation will refer to, and `./src/module-one` is pointing to an `./src/module-one/index.tsx` file that exports the module.  It is also acceptable to point at a non-index file such as `./src/module-one/ModuleOne.tsx` if that's how your code is structured.
-
 ## 6. Add a Type Declaration file (app.d.ts)
 
 Create an `app.d.ts` file in the root of your MFE with the following contents: