| id | title |
|---|---|
upgrading-to-jest29 |
From v28 to v29 |
Upgrading Jest from v28 to v29? This guide aims to help refactoring your configuration and tests.
:::info
See changelog for the full list of changes.
:::
:::note
Upgrading from an older version? You can see the upgrade guide from v27 to v28 here.
:::
The supported Node versions are 14.15, 16.10, 18.0 and above.
As announced in the Jest 28 blog post, Jest 29 has changed the default snapshot formatting to {escapeString: false, printBasicPrototype: false}.
If you want to keep the old behavior, you can set the snapshotFormat property to:
+ snapshotFormat: {
+ escapeString: true,
+ printBasicPrototype: true
+ }jest-environment-jsdom has upgraded jsdom from v19 to v20. Note that if you use jest-environment-jsdom, the minimum TypeScript version is set to 4.5.
Notably, jsdom@20 includes support for crypto.getRandomValues(), which means packages like jsdom and nanoid, which doesn't work properly in Jest@28, can work without extra polyfills.
Exports of Mocked* utility types changed. MaybeMockedDeep and MaybeMocked now are exported as Mocked and MockedShallow respectively; only deep mocked variants of MockedClass, MockedFunction and MockedObject are exposed.
ConvertAnsi plugin is removed in favour of jest-serializer-ansi-escapes.