Add eslint instructions to getting started (#14562)

Author: yepitschunked

docs/GettingStarted.md

@@ -205,3 +205,38 @@ npm install --save-dev @types/jest
 `@types/jest` is a third party library maintained at [DefinitelyTyped](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/jest), hence the latest Jest features or versions may not be covered yet. Try to match versions of Jest and `@types/jest` as closely as possible. For example, if you are using Jest `27.4.0` then installing `27.4.x` of `@types/jest` is ideal.
 
 :::
+
+### Using ESLint
+
+Jest can be used with ESLint without any further configuration as long as you import the [Jest global helpers](GlobalAPI.md) (`describe`, `it`, etc.) from `@jest/globals` before using them in your test file. This is necessary to avoid `no-undef` errors from ESLint, which doesn't know about the Jest globals.
+
+If you'd like to avoid these imports, you can configure your [ESLint environment](https://eslint.org/docs/latest/use/configure/language-options#specifying-environments) to support these globals by adding the `jest` environment:
+
+```json
+{
+  "overrides": [
+    {
+      "files": ["tests/**/*"],
+      "env": {
+        "jest": true
+      }
+    }
+  ]
+}
+```
+
+Or use [`eslint-plugin-jest`](https://github.com/jest-community/eslint-plugin-jest), which has a similar effect:
+
+```json
+{
+  "overrides": [
+    {
+      "files": ["tests/**/*"],
+      "plugins": ["jest"],
+      "env": {
+        "jest/globals": true
+      }
+    }
+  ]
+}
+```

website/versioned_docs/version-29.4/GettingStarted.md

@@ -205,3 +205,38 @@ npm install --save-dev @types/jest
 `@types/jest` is a third party library maintained at [DefinitelyTyped](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/jest), hence the latest Jest features or versions may not be covered yet. Try to match versions of Jest and `@types/jest` as closely as possible. For example, if you are using Jest `27.4.0` then installing `27.4.x` of `@types/jest` is ideal.
 
 :::
+
+### Using ESLint
+
+Jest can be used with ESLint without any further configuration as long as you import the [Jest global helpers](GlobalAPI.md) (`describe`, `it`, etc.) from `@jest/globals` before using them in your test file. This is necessary to avoid `no-undef` errors from ESLint, which doesn't know about the Jest globals.
+
+If you'd like to avoid these imports, you can configure your [ESLint environment](https://eslint.org/docs/latest/use/configure/language-options#specifying-environments) to support these globals by adding the `jest` environment:
+
+```json
+{
+  "overrides": [
+    {
+      "files": ["tests/**/*"],
+      "env": {
+        "jest": true
+      }
+    }
+  ]
+}
+```
+
+Or use [`eslint-plugin-jest`](https://github.com/jest-community/eslint-plugin-jest), which has a similar effect:
+
+```json
+{
+  "overrides": [
+    {
+      "files": ["tests/**/*"],
+      "plugins": ["jest"],
+      "env": {
+        "jest/globals": true
+      }
+    }
+  ]
+}
+```

website/versioned_docs/version-29.5/GettingStarted.md

@@ -205,3 +205,38 @@ npm install --save-dev @types/jest
 `@types/jest` is a third party library maintained at [DefinitelyTyped](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/jest), hence the latest Jest features or versions may not be covered yet. Try to match versions of Jest and `@types/jest` as closely as possible. For example, if you are using Jest `27.4.0` then installing `27.4.x` of `@types/jest` is ideal.
 
 :::
+
+### Using ESLint
+
+Jest can be used with ESLint without any further configuration as long as you import the [Jest global helpers](GlobalAPI.md) (`describe`, `it`, etc.) from `@jest/globals` before using them in your test file. This is necessary to avoid `no-undef` errors from ESLint, which doesn't know about the Jest globals.
+
+If you'd like to avoid these imports, you can configure your [ESLint environment](https://eslint.org/docs/latest/use/configure/language-options#specifying-environments) to support these globals by adding the `jest` environment:
+
+```json
+{
+  "overrides": [
+    {
+      "files": ["tests/**/*"],
+      "env": {
+        "jest": true
+      }
+    }
+  ]
+}
+```
+
+Or use [`eslint-plugin-jest`](https://github.com/jest-community/eslint-plugin-jest), which has a similar effect:
+
+```json
+{
+  "overrides": [
+    {
+      "files": ["tests/**/*"],
+      "plugins": ["jest"],
+      "env": {
+        "jest/globals": true
+      }
+    }
+  ]
+}
+```

website/versioned_docs/version-29.6/GettingStarted.md

@@ -205,3 +205,38 @@ npm install --save-dev @types/jest
 `@types/jest` is a third party library maintained at [DefinitelyTyped](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/jest), hence the latest Jest features or versions may not be covered yet. Try to match versions of Jest and `@types/jest` as closely as possible. For example, if you are using Jest `27.4.0` then installing `27.4.x` of `@types/jest` is ideal.
 
 :::
+
+### Using ESLint
+
+Jest can be used with ESLint without any further configuration as long as you import the [Jest global helpers](GlobalAPI.md) (`describe`, `it`, etc.) from `@jest/globals` before using them in your test file. This is necessary to avoid `no-undef` errors from ESLint, which doesn't know about the Jest globals.
+
+If you'd like to avoid these imports, you can configure your [ESLint environment](https://eslint.org/docs/latest/use/configure/language-options#specifying-environments) to support these globals by adding the `jest` environment:
+
+```json
+{
+  "overrides": [
+    {
+      "files": ["tests/**/*"],
+      "env": {
+        "jest": true
+      }
+    }
+  ]
+}
+```
+
+Or use [`eslint-plugin-jest`](https://github.com/jest-community/eslint-plugin-jest), which has a similar effect:
+
+```json
+{
+  "overrides": [
+    {
+      "files": ["tests/**/*"],
+      "plugins": ["jest"],
+      "env": {
+        "jest/globals": true
+      }
+    }
+  ]
+}
+```

website/versioned_docs/version-29.7/GettingStarted.md

@@ -205,3 +205,38 @@ npm install --save-dev @types/jest
 `@types/jest` is a third party library maintained at [DefinitelyTyped](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/jest), hence the latest Jest features or versions may not be covered yet. Try to match versions of Jest and `@types/jest` as closely as possible. For example, if you are using Jest `27.4.0` then installing `27.4.x` of `@types/jest` is ideal.
 
 :::
+
+### Using ESLint
+
+Jest can be used with ESLint without any further configuration as long as you import the [Jest global helpers](GlobalAPI.md) (`describe`, `it`, etc.) from `@jest/globals` before using them in your test file. This is necessary to avoid `no-undef` errors from ESLint, which doesn't know about the Jest globals.
+
+If you'd like to avoid these imports, you can configure your [ESLint environment](https://eslint.org/docs/latest/use/configure/language-options#specifying-environments) to support these globals by adding the `jest` environment:
+
+```json
+{
+  "overrides": [
+    {
+      "files": ["tests/**/*"],
+      "env": {
+        "jest": true
+      }
+    }
+  ]
+}
+```
+
+Or use [`eslint-plugin-jest`](https://github.com/jest-community/eslint-plugin-jest), which has a similar effect:
+
+```json
+{
+  "overrides": [
+    {
+      "files": ["tests/**/*"],
+      "plugins": ["jest"],
+      "env": {
+        "jest/globals": true
+      }
+    }
+  ]
+}
+```