woocommerce/plugins/woocommerce-blocks/docs/blocks/feature-flags-and-experimen...

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We have feature gating system setup in our plugin that defines what is accessible to the public and what is not, it has three phases:
* **Core flag `WOOCOMMERCE_BLOCKS_PHASE=1`:** anything that is not hidden behind a flag, falls under this category, and it contains all of the code that runs on WooCommerce Core plugin.
* **Feature plugin flag `WOOCOMMERCE_BLOCKS_PHASE=2`**: anything that is behind this flag is code that is shipped to our [feature plugin](https://wordpress.org/plugins/woo-gutenberg-products-block/), the files of blocks behind this flag are also present in WooCommerce Core, just not active.
* **Experimental flag `WOOCOMMERCE_BLOCKS_PHASE=3`**: This flag contains things that we're not shipping yet, so unfinished work mostly. These features are only available in developer builds of the plugin.
We also use an `__experimental` prefix for any experimental interfaces. This is a signal to those reading our code that it should not be implemented in for production use. Currently this prefix is used in the following ways:
* Prefixing references that are experimental. An example would be PHP action or filter slugs.
* Prefixing functions or methods that are experimental.
## Blocks behind flags
The majority of our feature flagging is blocks, this is a list of them:
### Feature plugin flag
* Cart block ([JS flag](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/9b76ea7a1680e68cc20bfee01078e43ccfc996bd/assets/js/blocks/cart-checkout/cart/index.js#L53) | [PHP flag 1](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/e167b2c99c68e8113b4e371fefdd6f9a356ed2e8/src/Library.php#L74-L77) | [PHP flag 2](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/src/Assets.php#L92-L95)).
* Checkout block ([JS flag](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/9b76ea7a1680e68cc20bfee01078e43ccfc996bd/assets/js/blocks/cart-checkout/checkout/index.js#L52) | [PHP flag](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/e167b2c99c68e8113b4e371fefdd6f9a356ed2e8/src/Library.php#L74-L77) | [PHP flag 2](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/src/Assets.php#L92-L95)).
### Experimental flag
* Single Product block ([JS flag](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/9b76ea7a1680e68cc20bfee01078e43ccfc996bd/assets/js/blocks/single-product/index.js#L43) | [PHP flag 1](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/e167b2c99c68e8113b4e371fefdd6f9a356ed2e8/src/Library.php#L79-L81) | [PHP flag 2](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/src/Assets.php#L88-L90) | [webpack flag](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/bin/webpack-entries.js#L48-L50)).
* ⚛️ Add to cart ([JS flag](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/add-to-cart/index.js#L29-L32)).
* ⚛️ Product category list ([JS flag](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/category-list/index.js#L29-L32)).
* ⚛️ Product SKU ([JS flag](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/sku/index.js#L29-L33)).
* ⚛️ Product stock indicator ([JS flag](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/stock-indicator/index.js#L29-L33)).
* ⚛️ Product tag list ([JS flag](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/tag-list/index.js#L29-L33)).
## Features behind flags
We also have individual features or code blocks behind a feature flag, this is a list of them:
### Feature plugin flag
* Draft order and cleanup process ([PHP flag](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/e167b2c99c68e8113b4e371fefdd6f9a356ed2e8/src/Domain/Services/DraftOrders.php#L42-L51)).
* ⚛️ Product Price new controls ([JS flag 1](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/price/attributes.js#L13-L44) | [JS flag 2-1](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/price/block.js#L109-L110) | [JS flag 2-2](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/price/block.js#L161-L162) | [JS flag 2-3](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/price/block.js#L165) | [JS flag 2-4](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/price/block.js#L196-L197) | [JS flag 2-5](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/price/block.js#L199) | [JS flag 2-6](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/price/block.js#L210-L211) | [JS flag 2-7](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/price/block.js#L213) | [JS flag 2-8](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/price/block.js#L231) | [JS flag 2-9](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/price/block.js#L233) | [JS flag 3-1](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/price/edit.js#L59-L108) | [JS flag 3-2](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/price/edit.js#L114-L131)).
* ⚛️ Product Title new controls ([JS flag 1](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/title/attributes.js#L21-L40) | [JS flag 2-1](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/title/block.js#L70-L72) | [JS flag 2-2](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/title/block.js#L94-L95) | [JS flag 2-3](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/title/block.js#L104) | [JS flag 3-1](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/title/edit.js#L47-L54) | [JS flag 3-2](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/title/edit.js#L77-L107) | [JS flag 3-3](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/title/edit.js#L116-L129)).
* Utility function to pass styles to a block ([JS flag](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/9ebddbc5d21eb3cc67fedddbccbd86453313eb64/assets/js/atomic/utils/block-styling.js#L6-L12)).
### Experimental plugin flag
* Inserting Product Element blocks globally from the inserter ([JS flag](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/assets/js/atomic/blocks/product-elements/shared/config.js#L25-L27)).
## Processes and commands that use a flag
* `npm run build:deploy` uses the feature plugin flag ([env flag](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/c0de18ec0a798c072420c67a689e4cc4d3ac77c9/package.json#L28)).
* travis uses the experimental flag when running tests ([env flags](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/d6a506c19056d42d40743ae0126153fb81004672/.travis.yml#L68-L143)).
* webpack creates a `blocks.ini` when running ([env flag](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/bin/webpack-configs.js#L95-L102)).
* webpack filters out experimental blocks when building. ([env flag](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b3a9753d8b7dae18b36025d09fbff835b8365de0/bin/webpack-entries.js#L61-L66)).
* certain e2e tests are skipped if the environment is not met ([env flag](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/50e7411aee51afb3fbfa8561e297085ee44e40c0/tests/e2e-tests/specs/backend/cart.test.js#L18)).
## Usages of `__experimental` prefix