[WIP] Server Components by schultek · Pull Request #776 · schultek/jaspr

schultek · 2026-03-16T13:29:24Z

Description

Add support for Server Components to Jaspr.

Type of Change

❌ Breaking change
✨ New feature or improvement

# Conflicts: # packages/jaspr/lib/src/browser/browser_binding.dart # packages/jaspr/lib/src/browser/clients.dart # packages/jaspr/lib/src/browser/js_data.dart # packages/jaspr/lib/src/foundation/sync.dart # packages/jaspr/lib/src/framework/render_element.dart # packages/jaspr/lib/src/server/document/document.dart # packages/jaspr/lib/src/server/document/document_base.dart # packages/jaspr/lib/src/server/document/document_binding.dart # packages/jaspr/lib/src/server/document/document_file.dart # packages/jaspr/lib/src/server/markup_renderer.dart # packages/jaspr_builder/lib/src/client/client_part_builder.dart

# Conflicts: # packages/jaspr/lib/src/browser/clients.dart # packages/jaspr_builder/lib/src/client/client_module_builder.dart

# Conflicts: # packages/jaspr/lib/browser.dart # packages/jaspr/lib/src/browser/clients.dart # packages/jaspr/lib/src/components/raw_text/raw_text_web.dart # packages/jaspr/lib/src/foundation/options.dart # packages/jaspr/lib/src/server/adapters/client_component_adapter.dart # packages/jaspr/lib/src/server/adapters/client_script_adapter.dart # packages/jaspr/lib/src/server/adapters/sync_script_adapter.dart # packages/jaspr/lib/src/server/server_binding.dart # packages/jaspr_builder/lib/src/client/client_module_builder.dart # packages/jaspr_builder/lib/src/client/client_registry_builder.dart

# Conflicts: # packages/jaspr/lib/src/browser/clients.dart # packages/jaspr/lib/src/components/raw_text/raw_text_web.dart # packages/jaspr/lib/src/foundation/marker_utils.dart # packages/jaspr/lib/src/foundation/options.dart # packages/jaspr/lib/src/server/adapters/client_component_adapter.dart # packages/jaspr/lib/src/server/adapters/client_script_adapter.dart # packages/jaspr/lib/src/server/server_binding.dart # packages/jaspr/test/browser/hydration/hydration_browser_test.dart # packages/jaspr_builder/lib/src/client/client_module_builder.dart # packages/jaspr_builder/lib/src/codec/codecs.dart

# Conflicts: # packages/jaspr/lib/src/browser/clients.dart # packages/jaspr/lib/src/client/custom_node_component.dart # packages/jaspr/lib/src/dom/raw_text/raw_text_web.dart # packages/jaspr/lib/src/foundation/options.dart # packages/jaspr/lib/src/server/adapters/client_component_adapter.dart # packages/jaspr/lib/src/server/adapters/client_script_adapter.dart # packages/jaspr/lib/src/server/server_binding.dart # packages/jaspr/test/client/hydration/hydration_browser_test.dart # packages/jaspr_builder/lib/src/client/client_module_builder.dart # packages/jaspr_builder/lib/src/codec/codec_module_builder.dart # packages/jaspr_builder/test/client/sources/client_basic.dart # packages/jaspr_builder/test/client/sources/client_model_class.dart # packages/jaspr_builder/test/client/sources/client_model_extension.dart # packages/jaspr_builder/test/sync/sources/sync_model_class.dart # packages/jaspr_builder/test/sync/sources/sync_model_extension.dart

# Conflicts: # packages/jaspr/lib/src/client/component_anchors.dart # packages/jaspr/lib/src/server/adapters/client_component_adapter.dart # packages/jaspr/lib/src/server/server_binding.dart # packages/jaspr_builder/lib/src/client/client_module_builder.dart # packages/jaspr_builder/lib/src/codec/codecs.dart # packages/jaspr_builder/lib/src/sync/sync_mixins_builder.dart # packages/jaspr_builder/test/client/sources/bundle.dart # packages/jaspr_builder/test/client/sources/client_basic.dart # packages/jaspr_builder/test/client/sources/client_model_class.dart # packages/jaspr_builder/test/client/sources/client_model_extension.dart # packages/jaspr_builder/test/codec/sources/bundle.dart # packages/jaspr_builder/test/codec/sources/model_class.dart # packages/jaspr_builder/test/codec/sources/model_extension.dart # packages/jaspr_builder/test/sync/sources/sync_basic.dart # packages/jaspr_builder/test/sync/sources/sync_multi.dart

docs-page · 2026-03-16T13:29:29Z

To view this pull requests documentation preview, visit the following URL:

docs.page/schultek/jaspr~776

Documentation is deployed and generated using docs.page.

github-actions · 2026-03-16T13:31:31Z

Package Version Report

The following packages have been updated:
jaspr_test : 0.23.0 -> 0.24.0
jaspr : 0.23.0 -> 0.24.0
jaspr_builder : 0.23.0 -> 0.24.0
jaspr_cli : 0.23.0+3 -> 0.24.0
jaspr_router : 0.8.2 -> 0.8.3
jaspr_content : 0.5.2 -> 0.5.3
jaspr_flutter_embed : 0.4.11 -> 0.4.12
jaspr_riverpod : 0.4.5 -> 0.4.6
jaspr_serverpod : 0.6.1 -> 0.6.2

codecov · 2026-03-16T13:40:12Z

Codecov Report

❌ Patch coverage is 62.38361% with 202 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.10%. Comparing base (ee742ff) to head (f5bbd92).

Files with missing lines	Patch %	Lines
...ckages/jaspr/lib/src/client/component_anchors.dart	52.23%	32 Missing ⚠️
...kages/jaspr/lib/src/client/slotted_child_view.dart	70.00%	30 Missing ⚠️
packages/jaspr/lib/src/framework/build_owner.dart	0.00%	21 Missing ⚠️
packages/jaspr/lib/src/client/client_binding.dart	37.50%	20 Missing ⚠️
.../src/server/adapters/client_component_adapter.dart	41.93%	18 Missing ⚠️
packages/jaspr/lib/src/server/server_handler.dart	15.00%	17 Missing ⚠️
packages/jaspr/lib/src/framework/components.dart	90.81%	9 Missing ⚠️
packages/jaspr/lib/src/framework/framework.dart	22.22%	7 Missing ⚠️
packages/jaspr/lib/src/client/client_app.dart	50.00%	6 Missing ⚠️
...es/jaspr/lib/src/framework/stateful_component.dart	0.00%	6 Missing ⚠️
... and 12 more

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #776      +/-   ##
==========================================
- Coverage   68.52%   68.10%   -0.43%     
==========================================
  Files         212      214       +2     
  Lines       11857    12251     +394     
==========================================
+ Hits         8125     8343     +218     
- Misses       3732     3908     +176

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parlough

Exciting!! I haven't tried it out yet, but some small questions and a few minor suggestions to consider:

schultek · 2026-03-18T13:26:45Z

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+    for (var i = 0; i < _adapters.length; i++) {
+      final r = _adapters[i].prepare();


Can't use foreach because new adapters can be added during .prepare(). I will add a comment.

parlough · 2026-03-18T12:39:39Z

+    rootRenderObject.node = newNode;
+    rootRenderObject.toHydrate = [...newNode.childNodes.toIterable()];


Maybe encapsulate this logic in a new method on RootDomRenderObject, so node doesn't need to have a public setter.

Done. Also I noticed I could remove some dead code in RootDomRenderObject.

parlough · 2026-03-18T12:45:00Z

+
+  /// Reloads the current page.
+  void reload([String? path]) {
+    throw UnimplementedError('Should be overridden on client and server.');


It seems the client's AppContext extension doesn't have this method. Is that intended?

Ah no, that is leftover from I feature I was experimenting with but decided against for the initial version of server components. Will remove.

parlough · 2026-03-18T12:54:17Z

+    } else if (allowComponent &&
+        type.element.name == 'Component' &&
+        type.element.library.identifier == 'package:jaspr/src/framework/framework.dart') {
+      return (decoder: 'p.mount($argument)', cast: 'String');


What if the component parameter is nullable? Should this consider the nullability suffix like the above handling?

Kilian Schulte and others added 21 commits June 14, 2024 16:39

add server components setup

2b9bbfd

finish server components

497460f

update server_components experiment

9ad1735

Merge branch 'main' into feat/server-components

842b897

# Conflicts: # packages/jaspr/lib/src/browser/clients.dart # packages/jaspr_builder/lib/src/client/client_module_builder.dart

fix merge issues

35ce3d8

fixes

0f2d046

fix server comp experiment

a732436

fix nested client components

bb2e0d2

extend server component handling

4230c82

add stateful reload feature

6e499de

Merge branch 'main' into feat/server-components

0c0cbe2

add reload event handling

c08515a

add onReload feature

f0073ce

update experiment

7bb7ed6

Merge branch 'main' into feat/server-components

7053147

make reload private

2034181

parlough reviewed Mar 18, 2026

View reviewed changes

apply review

e46ec38

schultek force-pushed the feat/server-components branch from 38c987f to e46ec38 Compare March 18, 2026 14:11

schultek and others added 2 commits April 20, 2026 11:34

Feat: Component.apply with target (#777)

95719cd

Merge branch 'main' into feat/server-components

f5bbd92

schultek changed the base branch from main to next April 20, 2026 09:38

		for (var i = 0; i < _adapters.length; i++) {
		final r = _adapters[i].prepare();

		rootRenderObject.node = newNode;
		rootRenderObject.toHydrate = [...newNode.childNodes.toIterable()];

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schultek commented Mar 16, 2026

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github-actions Bot commented Mar 16, 2026 •

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