v8.4.0

What's Changed

• fix(engine): fix mutation tracking when getter throws by @nolanlawson in #4688
• chore(integration-karma): provide filename for ssr code in hydration tests by @cardoso in #4683
• test(integration-karma): fix flaky PerformanceObserver test by @nolanlawson in #4693
• test: test slots not at top level by @nolanlawson in #4689
• chore(engine-server): run test fixtures concurrently by @cardoso in #4690
• feat(ssr): add SSR compilation mode by @divmain in #4685
• fix(ssr): more fixes for light DOM slots by @nolanlawson in #4695
• test(hydration): add tests for empty string mismatch by @nolanlawson in #4698
• fix(ssr): support .ts files by @nolanlawson in #4696
• refactor(ssr-compiler): runtime reflection for aria attributes by @ekashida in #4694
• fix(engine-core): dynamic class with empty string results in hydration mismatch by @cardoso in #4684
• chore: resolve minor feedback from #4685 by @divmain in #4700
• fix(ssr): fix expression scoping and other small fixes by @nolanlawson in #4702
• test(ssr): add ssr benchmarks by @nolanlawson in #4708
• build(deps): bump postcss-selector-parser from 6.1.2 to 7.0.0 by @dependabot in #4713
• test(engine-server): lowercase attribute names by @ekashida in #4706
• chore: release v8.4.0 by @nolanlawson in #4716
• chore: release v8.4.0 by @nolanlawson in #4718

Full Changelog: v8.3.0...v8.4.0