Merge branch 'master' into patch-1

* master:
  chore: upgrade to fsevents 2 (jestjs#9215)
  docs: remove expect.assertions(1) in rejects example of Tutoria… (jestjs#9149)
  chore: bump to istanbul alphas (jestjs#9192)
  Fix typo in JestPlatform.md (jestjs#9212)
  jest-snapshot: Ignore indentation for most serialized objects (jestjs#9203)
  fix(jest-types): tighten Config types and set more defaults (jestjs#9200)
  jest-snapshot: Improve colors when snapshots are updatable (jestjs#9132)
  jest-snapshot: Omit irrelevant received properties when property matchers fail (jestjs#9198)
  chore: make changedFiles option optional in `shouldInstrument` (jestjs#9197)
  fix(pretty-format): correctly detect memo (jestjs#9196)
  chore: regenerate lockfiles in e2e tests (jestjs#9193)
  chore: bump handlebars

CHANGELOG.md

@@ -27,6 +27,8 @@
 - `[jest-runner]` Warn if a worker had to be force exited ([#8206](https://github.com/facebook/jest/pull/8206))
 - `[jest-snapshot]` Display change counts in annotation lines ([#8982](https://github.com/facebook/jest/pull/8982))
 - `[jest-snapshot]` [**BREAKING**] Improve report when the matcher has properties ([#9104](https://github.com/facebook/jest/pull/9104))
+- `[jest-snapshot]` Improve colors when snapshots are updatable ([#9132](https://github.com/facebook/jest/pull/9132))
+- `[jest-snapshot]` Ignore indentation for most serialized objects ([#9203](https://github.com/facebook/jest/pull/9203))
 - `[@jest/test-result]` Create method to create empty `TestResult` ([#8867](https://github.com/facebook/jest/pull/8867))
 - `[jest-worker]` [**BREAKING**] Return a promise from `end()`, resolving with the information whether workers exited gracefully ([#8206](https://github.com/facebook/jest/pull/8206))
 - `[jest-reporters]` Transform file paths into hyperlinks ([#8980](https://github.com/facebook/jest/pull/8980))
@@ -52,9 +54,12 @@
 - `[jest-snapshot]` Distinguish empty string from external snapshot not written ([#8880](https://github.com/facebook/jest/pull/8880))
 - `[jest-snapshot]` [**BREAKING**] Distinguish empty string from internal snapshot not written ([#8898](https://github.com/facebook/jest/pull/8898))
 - `[jest-snapshot]` [**BREAKING**] Remove `report` method and throw matcher errors ([#9049](https://github.com/facebook/jest/pull/9049))
+- `[jest-snapshot]` Omit irrelevant `received` properties when property matchers fail ([#9198](https://github.com/facebook/jest/pull/9198))
 - `[jest-transform]` Properly cache transformed files across tests ([#8890](https://github.com/facebook/jest/pull/8890))
-- `[jest-utils]` Allow querying process.domain ([#9136](https://github.com/facebook/jest/pull/9136))
 - `[jest-transform]` Don't fail the test suite when a generated source map is invalid ([#9058](https://github.com/facebook/jest/pull/9058))
+- `[jest-types]` [**BREAKING**] Use less `null | undefined` in config types ([#9200](https://github.com/facebook/jest/pull/9200))
+- `[jest-utils]` Allow querying process.domain ([#9136](https://github.com/facebook/jest/pull/9136))
+- `[pretty-format]` Correctly detect memoized elements ([#9196](https://github.com/facebook/jest/pull/9196))
 
 ### Chore & Maintenance
 
@@ -71,6 +76,8 @@
 - `[jest-cli]` [**BREAKING**] Remove re-exports from `@jest/core` ([#8874](https://github.com/facebook/jest/pull/8874))
 - `[jest-diff]` Remove the need to export `splitLines0` function ([#9151](https://github.com/facebook/jest/pull/9151))
 - `[jest-environment-jsdom]` [**BREAKING**] Upgrade JSDOM from v11 to v15 ([#8851](https://github.com/facebook/jest/pull/8851))
+- `[jest-haste-map]` Upgrade to `fsevents@2` ([#9215](https://github.com/facebook/jest/pull/9215))
+- `[jest-reporters]` [**BREAKING**] Upgrade Istanbul dependencies, which are used for code coverage ([#9192](https://github.com/facebook/jest/pull/9192))
 - `[jest-util]` [**BREAKING**] Remove deprecated exports ([#8863](https://github.com/facebook/jest/pull/8863))
 - `[jest-validate]` [**BREAKING**] Use ESM exports ([#8874](https://github.com/facebook/jest/pull/8874))
 - `[jest-types]` Mark `InitialOptions` as `Partial` ([#8848](https://github.com/facebook/jest/pull/8848))

docs/JestPlatform.md

@@ -119,7 +119,7 @@ You can read more about `jest-validate` in the [readme file](https://github.com/
 
 ## jest-worker
 
-Module used for parallelization of tasks. Exports a class `Worker` that takes the path of Node.js module and lets you call the module's exported methods as if they where class methods, returning a promise that resolves when the specified method finishes its execution in a forked process.
+Module used for parallelization of tasks. Exports a class `Worker` that takes the path of Node.js module and lets you call the module's exported methods as if they were class methods, returning a promise that resolves when the specified method finishes its execution in a forked process.
 
 ### Example
 

docs/TutorialAsync.md

@@ -140,7 +140,7 @@ it('tests error with async/await', async () => {
 
 ## `.rejects`
 
-The`.rejects` helper works like the `.resolves` helper. If the promise is fulfilled, the test will automatically fail.
+The`.rejects` helper works like the `.resolves` helper. If the promise is fulfilled, the test will automatically fail. `expect.assertions(number)` is not required but recommended to verify that a certain number of [assertions](https://jestjs.io/docs/en/expect#expectassertionsnumber) are called during a test. It is otherwise easy to forget to `return`/`await` the `.resolves` assertions.
 
 ```js
 // Testing for async errors using `.rejects`.