docs(prefer-strict-boolean-matchers): added documentation for the rule (#653)

Author: marekdedic

README.md

@@ -197,6 +197,7 @@ export default [
 | [prefer-mock-promise-shorthand](docs/rules/prefer-mock-promise-shorthand.md)                                             | enforce mock resolved/rejected shorthands for promises                |    | 🌐 | 🔧 |    |    |
 | [prefer-snapshot-hint](docs/rules/prefer-snapshot-hint.md)                                                               | enforce including a hint with external snapshots                      |    | 🌐 |    |    |    |
 | [prefer-spy-on](docs/rules/prefer-spy-on.md)                                                                             | enforce using `vi.spyOn`                                              |    | 🌐 | 🔧 |    |    |
+| [prefer-strict-boolean-matchers](docs/rules/prefer-strict-boolean-matchers.md)                                           | enforce using `toBe(true)` and `toBe(false)` over matchers that coerce types to boolean |    | 🌐 | 🔧 |    |    |
 | [prefer-strict-equal](docs/rules/prefer-strict-equal.md)                                                                 | enforce strict equal over equal                                       |    | 🌐 |    | 💡 |    |
 | [prefer-to-be](docs/rules/prefer-to-be.md)                                                                               | enforce using toBe()                                                  |    | 🌐 | 🔧 |    |    |
 | [prefer-to-be-falsy](docs/rules/prefer-to-be-falsy.md)                                                                   | enforce using toBeFalsy()                                             |    | 🌐 | 🔧 |    |    |

docs/rules/prefer-strict-boolean-matchers.md

@@ -0,0 +1,24 @@
+# Enforce using `toBe(true)` and `toBe(false)` over matchers that coerce types to boolean (`vitest/prefer-strict-boolean-matchers`)
+
+⚠️ This rule _warns_ in the 🌐 `all` config.
+
+🔧 This rule is automatically fixable by the [`--fix` CLI option](https://eslint.org/docs/latest/user-guide/command-line-interface#--fix).
+
+<!-- end auto-generated rule header -->
+
+This rule enforces using `toBe(true)` and `toBe(false)`, which only match if the value is the corresponding boolean value. This is unlike `toBeTruthy()`, which matches any truthy value, such as a non-zero number or a non-empty string (which are, conversely, matched by `toBeFalsy()`).
+
+```js
+// bad
+expect(foo).toBeTruthy()
+expectTypeOf(foo).toBeTruthy()
+expect(foo).toBeFalsy()
+expectTypeOf(foo).toBeFalsy()
+
+
+// good
+expect(foo).toBe(true)
+expectTypeOf(foo).toBe(true)
+expect(foo).toBe(false)
+expectTypeOf(foo).toBe(false)
+```