New Stuff

• shallow/mount: add simulateError (#1797)

Fixes

• shallow/mount: containsMatchingElement: trim whitespace (commit, #636)
• debug: inspect objects instead of showing them as <Component /> (commit)

Documentation

• mount: ref: Update docs to be consistent with v3 (#1242)

Refactors

• shallow/mount: make tests and method ordering more consistent (commit)
• RSTTraversal: remove unnecessary adapter truthiness check (commit)

New Stuff

• Add forwardRef support (#1592, jquense)
• Add Portal support (#1760, #1761, #1772, #1774, jgzuke)
• Add pointer events support (#1753, ljharb)

Fixes

• preemptively fix compat with React v16.4.3 (#1790, #1778, gaearon, aweary)
• shallow: prevent rerenders with PureComponents (#1786, koba04)
• shallow: skip updates when nextState is null or undefined (#1785, koba04)
• shallow: setState after setProps calls componentWillReceiveProps (#1779, peanutenthusiast)
• mount/shallow: be stricter on the wrapper’s setState/setProps callback (commit)
• shallow/mount: improve error message when wrapping invalid elements (#1759, jgzuke)

Refactors

• remove most uses of lodash (commit)

Meta Stuff

• ensure a license and readme is present in all packages when published

Fixes

• koba04: shallow: fix unexpected call to componentDidMount (#1768)

Fixes

• ljharb/@koba04: shallow: .setState(): stub out setState on non-root code paths as well (#1763)
• ljharb: shallow/mount: restore fallback when adapter lacks invokeSetStateCallback (commit)
• ljharb: mount: setState: invoke callback with the proper receiver (commit)
• ljharb: mount: state and setState should throw an explicit error message when called on an SFC (commit)

Fixes

• koba04: shallow: call cDU when an instance calls setState (#1742)
• ReactiveRaven: selectors: fix descendant selector (#1680)

Fixes

• ljharb: shallow: setProps: merge instead of replace props (commit)

Documentation

• koba04: Fix an adapter table style in README.md and a migration guide (#1734)

New Stuff

• madicap: shallow/mount: account for React.Fragment nodes (#1733)
• jquense: Debug: debugNode now returns [function] for function children (commit)
• ljharb: mount: add hydrateIn option (#1707)
• ljharb: shallow: add “lifecycles” adapter option (#1696)
• krawaller: shallow/mount: allow .exists() to take an optional selector (#1695)
• koba04: shallow: Add getSnapshotBeforeUpdate support (#1657)
• jquense: shallow/mount: Add support for some pseudo selectors (#1537)
• blainekasten: debug: Implement verbose debug output (#1547)
• jquense/@ljharb: Debug: typeName now calls the adapter’s displayNameOfNode if available (#1701)
• jquense/@ljharb: mount/shallow: .name(): call into adapter’s displayNameOfNode, if present (#1701)
• jquense/@ljharb: Utils: nodeHasType: call into adapter’s displayNameOfNode, if present (#1701)
• jquense/@ljharb: selectors: buildPredicate: call into adapter’s isValidElementType, if present (#1701)
• emuraton/@ljharb: shallow: setProps(): Add callback argument (#1721)
• ljharb: mount: add .equals() (commit)
• madicap: Extract getAdapter from Utils into its own file (#1732)

Fixes

• ljharb: shallow/mount: matchesElement/containsMatchingElement: get adapter with options (commit)
• ljharb: RSTTraversal: remove nodeHasProperty export; broken since #1157 (commit)
• ljharb/@KordonDev: shallow: .at(): return an empty wrapper when an index does not exist (#1478)
• ljharb: shallow: .equals(): flatten children when comparing (commit)
• ljharb: mount/shallow: do not dedupe in flatMap (commit)
• ljharb: shallow: .closest(): ensure an empty wrapper is returned for no match (commit)
• krawaller: selectors: make general sibling not throw on root (#1698)
• ljharb/@angelikatyborska : mount: text(): null nodes return null (#1582)
• ljharb: shallow: simulate: ensure it returns itself (commit)
• koba04: shallow: ShallowWrapper calls update() automatically (#1499)
• bdwain: mount/shallow: return null for missing keys (#1536)
• vsiao: Fix ShallowWrapper for array-rendering components (#1498)
• koba04: Call setState callback after finishing the render (#1453)
• eddyerburgh: Convert nodes to RST nodes before comparing (#1423)
• ljharb: improve "bad adapter" error message (#1477)
• ljharb: shallow/mount: default iterator should be iterable (commit)

Refactors

• ReactiveRaven: selectors: fix typos; avoid reusing variable unnecessarily (#1681)
• koba04/@ljharb: shallow: Use spyMethod to inspect the result of shouldComponentUpdate/getSnapshotBeforeUpdate (#1192)
• ljharb: Utils: configuration: change to named exports. (commit)
• ljharb: use array.prototype.flat (commit)

Documentation

• jack-lewin: Clarify dev workflow in CONTRIBUTING.md (#1207)
• robrichard: Provide migration instructions for ref(refName) (#1470)
• DannyDelott: shallow/mount: Add callback arg to setProps header (#1361)
• conor-cafferkey-sociomantic: mount: Updated docs for ReactWrapper.instance(); remove docs for v2's getNode()/getNodes() (#1714)
• koba04: Make clearer the docs for .mount() (#1540)
• ialexryan: Update signature of .type() in shallow.md (#1492]([https://github.com/Add null option to shallow type() comment & docs enzymejs/enzyme#1492))

Meta Stuff

• ljharb: ensure a license and readme is present in all packages when published
• ljharb: [meta] fix package.json scripts