Add environment variables docs page

CHANGELOG.md

@@ -2,7 +2,6 @@
 
 ### Features
 
-- `[docs]` Add step for fetching `backers.json` file in website setup docs ([#10631](https://github.com/facebook/jest/pull/10631))
 - `[jest-cli, jest-config]` Add support for the `jest.config.ts` configuration file ([#10564](https://github.com/facebook/jest/pull/10564))
 
 ### Fixes
@@ -11,6 +10,9 @@
 
 ### Chore & Maintenance
 
+- `[docs]` Add step for fetching `backers.json` file in website setup docs ([#10631](https://github.com/facebook/jest/pull/10631))
+- `[docs]` Add page detailing environment variables set by Jest ([#10630](https://github.com/facebook/jest/pull/10630))
+
 ### Performance
 
 ## 26.5.3

docs/EnvironmentVariables.md

@@ -0,0 +1,14 @@
+---
+id: environment-variables
+title: Environment Variables
+---
+
+Jest sets the following environment variables:
+
+### `NODE_ENV`
+
+Set to `'test'` if it's not already set to something else.
+
+### `JEST_WORKER_ID`
+
+Each worker process is assigned a unique id (index-based that starts with `1`). This is set to `1` for all tests when [`runInBand`](CLI.md#--runinband) is set to true.

website/sidebars.json

@@ -39,7 +39,8 @@
       "mock-function-api",
       "jest-object",
       "configuration",
-      "cli"
+      "cli",
+      "environment-variables"
     ]
   }
 }

website/versioned_docs/version-22.x/EnvironmentVariables.md

@@ -0,0 +1,15 @@
+---
+id: version-22.x-environment-variables
+title: Environment Variables
+original_id: environment-variables
+---
+
+Jest sets the following environment variables:
+
+### `NODE_ENV`
+
+Set to `'test'` if it's not already set to something else.
+
+### `JEST_WORKER_ID`
+
+Each worker process is assigned a unique id (index-based that starts with `1`). This is set to `1` for all tests when [`runInBand`](CLI.md#--runinband) is set to true.

website/versioned_sidebars/version-22.x-sidebars.json

@@ -33,7 +33,8 @@
       "version-22.x-mock-function-api",
       "version-22.x-jest-object",
       "version-22.x-configuration",
-      "version-22.x-cli"
+      "version-22.x-cli",
+      "version-22.x-environment-variables"
     ]
   }
 }

website/versioned_sidebars/version-23.x-sidebars.json

@@ -36,7 +36,8 @@
       "version-23.x-mock-function-api",
       "version-23.x-jest-object",
       "version-23.x-configuration",
-      "version-23.x-cli"
+      "version-23.x-cli",
+      "version-23.x-environment-variables"
     ]
   }
 }

website/versioned_sidebars/version-24.x-sidebars.json

@@ -38,7 +38,8 @@
       "version-24.x-mock-function-api",
       "version-24.x-jest-object",
       "version-24.x-configuration",
-      "version-24.x-cli"
+      "version-24.x-cli",
+      "version-24.x-environment-variables"
     ]
   }
 }

website/versioned_sidebars/version-26.0-sidebars.json

@@ -39,7 +39,8 @@
       "version-26.0-mock-function-api",
       "version-26.0-jest-object",
       "version-26.0-configuration",
-      "version-26.0-cli"
+      "version-26.0-cli",
+      "version-26.0-environment-variables"
     ]
   }
 }