feat: export helper to manually suppress error output (#571)

* feat(console): export helper to manually suppress error output

Fixes #564

* docs: added docs for `suppressErrorOutput`

* fix(types): fix type of `suppressErrorOutput` to make result callable to restore console

* test: add tests for `suppressErrorOutput` export

* test: fix error suppression disabled tests for other renderers

Author: mpeyper

docs/api-reference.md

@@ -12,6 +12,7 @@ route: '/reference/api'
 - [`cleanup`](/reference/api#cleanup)
 - [`addCleanup`](/reference/api#addcleanup)
 - [`removeCleanup`](/reference/api#removecleanup)
+- [`suppressErrorOutput`](/reference/api#manually-suppress-output)
 
 ---
 
@@ -286,6 +287,10 @@ to filter out the unnecessary logging and restore the original version during cl
 side-effect can affect tests that also patch `console.error` (e.g. to assert a specific error
 message get logged) by replacing their custom implementation as well.
 
+> Please note that this is done automatically if the testing framework you're using supports the
+> `beforeEach` and `afterEach` global (like Jest, mocha and Jasmine). If not, you will need to do
+> [manual suppression](/reference/api#manually-suppress-output) around the test run.
+
 ### Disabling `console.error` filtering
 
 Importing `@testing-library/react-hooks/disable-error-filtering.js` in test setup files disable the
@@ -303,8 +308,8 @@ module.exports = {
 }
 ```
 
-Alternatively, you can change your test to import from `@testing-library/react-hooks/pure` (or any
-of the [other non-pure imports](/installation#pure-imports)) instead of the regular imports.
+Alternatively, you can change your test to import from `@testing-library/react-hooks` (or any of the
+[other non-pure imports](/installation#pure-imports)) instead of the regular imports.
 
 ```diff
 - import { renderHook, cleanup, act } from '@testing-library/react-hooks'
@@ -316,3 +321,25 @@ variable to `true` before importing `@testing-library/react-hooks` will also dis
 
 > Please note that this may result in a significant amount of additional logging in your test
 > output.
+
+### Manually suppress output
+
+If you are using [a pure import](/installation#pure-imports), you are running your tests in an
+environment that does not support `beforeEach` and `afterEach`, or if the automatic suppression is
+not available to you for some other reason, then you can use the `suppressErrorOutput` export to
+manually start and top suppress the output:
+
+```ts
+import { renderHook, suppressErrorOutput } from '@testing-library/react-hooks/pure'
+
+test('should handle thrown error', () => {
+  const restoreConsole = suppressErrorOutput()
+
+  try {
+    const { result } = renderHook(() => useCounter())
+    expect(result.error).toBeDefined()
+  } finally {
+    restoreConsole()
+  }
+})
+```

src/core/console.ts

@@ -1,28 +1,32 @@
 import filterConsole from 'filter-console'
 
+function suppressErrorOutput() {
+  if (process.env.RHTL_DISABLE_ERROR_FILTERING) {
+    return () => {}
+  }
+
+  return filterConsole(
+    [
+      /^The above error occurred in the <TestComponent> component:/, // error boundary output
+      /^Error: Uncaught .+/ // jsdom output
+    ],
+    {
+      methods: ['error']
+    }
+  )
+}
+
 function enableErrorOutputSuppression() {
   // Automatically registers console error suppression and restoration in supported testing frameworks
-  if (
-    typeof beforeEach === 'function' &&
-    typeof afterEach === 'function' &&
-    !process.env.RHTL_DISABLE_ERROR_FILTERING
-  ) {
-    let restoreConsole: () => void
+  if (typeof beforeEach === 'function' && typeof afterEach === 'function') {
+    let restoreConsole!: () => void
 
     beforeEach(() => {
-      restoreConsole = filterConsole(
-        [
-          /^The above error occurred in the <TestComponent> component:/, // error boundary output
-          /^Error: Uncaught .+/ // jsdom output
-        ],
-        {
-          methods: ['error']
-        }
-      )
+      restoreConsole = suppressErrorOutput()
     })
 
-    afterEach(() => restoreConsole?.())
+    afterEach(() => restoreConsole())
   }
 }
 
-export { enableErrorOutputSuppression }
+export { enableErrorOutputSuppression, suppressErrorOutput }

src/core/index.ts

@@ -2,6 +2,7 @@ import { CreateRenderer, Renderer, RenderResult, RenderHookOptions } from '../ty
 
 import { asyncUtils } from './asyncUtils'
 import { cleanup, addCleanup, removeCleanup } from './cleanup'
+import { suppressErrorOutput } from './console'
 
 function resultContainer<TValue>() {
   const results: Array<{ value?: TValue; error?: Error }> = []
@@ -81,4 +82,4 @@ function createRenderHook<
   return renderHook
 }
 
-export { createRenderHook, cleanup, addCleanup, removeCleanup }
+export { createRenderHook, cleanup, addCleanup, removeCleanup, suppressErrorOutput }

src/dom/__tests__/errorSuppression.disabled.test.ts

@@ -5,10 +5,10 @@ describe('error output suppression (disabled) tests', () => {
 
   beforeAll(() => {
     process.env.RHTL_DISABLE_ERROR_FILTERING = 'true'
+    require('..')
   })
 
   test('should not patch console.error', () => {
-    require('..')
     expect(console.error).toBe(originalConsoleError)
   })
 })

src/dom/__tests__/errorSuppression.pure.test.ts

@@ -1,15 +1,29 @@
+import { ReactHooksRenderer } from '../../types/react'
+
 // This verifies that if pure imports are used
 // then we DON'T auto-wire up the afterEach for folks
 describe('error output suppression (pure) tests', () => {
   const originalConsoleError = console.error
 
+  let suppressErrorOutput!: ReactHooksRenderer['suppressErrorOutput']
+
   beforeAll(() => {
-    require('../pure')
+    suppressErrorOutput = (require('../pure') as ReactHooksRenderer).suppressErrorOutput
   })
 
   test('should not patch console.error', () => {
     expect(console.error).toBe(originalConsoleError)
   })
-})
 
-export {}
+  test('should manually patch console.error', () => {
+    const restore = suppressErrorOutput()
+
+    try {
+      expect(console.error).not.toBe(originalConsoleError)
+    } finally {
+      restore()
+    }
+
+    expect(console.error).toBe(originalConsoleError)
+  })
+})

src/dom/pure.ts

@@ -37,6 +37,6 @@ const renderHook = createRenderHook(createDomRenderer)
 
 export { renderHook, act }
 
-export { cleanup, addCleanup, removeCleanup } from '../core'
+export { cleanup, addCleanup, removeCleanup, suppressErrorOutput } from '../core'
 
 export * from '../types/react'

src/native/__tests__/errorSuppression.disabled.test.ts

@@ -5,10 +5,10 @@ describe('error output suppression (disabled) tests', () => {
 
   beforeAll(() => {
     process.env.RHTL_DISABLE_ERROR_FILTERING = 'true'
+    require('..')
   })
 
   test('should not patch console.error', () => {
-    require('..')
     expect(console.error).toBe(originalConsoleError)
   })
 })

src/native/__tests__/errorSuppression.pure.test.ts

@@ -1,15 +1,29 @@
+import { ReactHooksRenderer } from '../../types/react'
+
 // This verifies that if pure imports are used
 // then we DON'T auto-wire up the afterEach for folks
 describe('error output suppression (pure) tests', () => {
   const originalConsoleError = console.error
 
+  let suppressErrorOutput!: ReactHooksRenderer['suppressErrorOutput']
+
   beforeAll(() => {
-    require('../pure')
+    suppressErrorOutput = (require('../pure') as ReactHooksRenderer).suppressErrorOutput
   })
 
   test('should not patch console.error', () => {
     expect(console.error).toBe(originalConsoleError)
   })
-})
 
-export {}
+  test('should manually patch console.error', () => {
+    const restore = suppressErrorOutput()
+
+    try {
+      expect(console.error).not.toBe(originalConsoleError)
+    } finally {
+      restore()
+    }
+
+    expect(console.error).toBe(originalConsoleError)
+  })
+})

src/native/pure.ts

@@ -36,6 +36,6 @@ const renderHook = createRenderHook(createNativeRenderer)
 
 export { renderHook, act }
 
-export { cleanup, addCleanup, removeCleanup } from '../core'
+export { cleanup, addCleanup, removeCleanup, suppressErrorOutput } from '../core'
 
 export * from '../types/react'

src/pure.ts

@@ -32,8 +32,8 @@ function getRenderer() {
   }
 }
 
-const { renderHook, act, cleanup, addCleanup, removeCleanup } = getRenderer()
+const { renderHook, act, cleanup, addCleanup, removeCleanup, suppressErrorOutput } = getRenderer()
 
-export { renderHook, act, cleanup, addCleanup, removeCleanup }
+export { renderHook, act, cleanup, addCleanup, removeCleanup, suppressErrorOutput }
 
 export * from './types/react'