stenciljs/core

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A toolchain for building scalable, enterprise-ready component systems on top of TypeScript and Web Component standards. Stencil components can be distributed natively to React, Angular, Vue, (+ more) and traditional web applications from a single, framework-agnostic codebase.

Stars: 13.1k
Forks: 855
Open beginner issues: 0
Indexed issues: 165
Avg merge: 4h 7m
Merged PRs (30d): 44

Dominant language: TypeScript
License: No license data
Last GitHub push: Sep 15, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

Beginner friendly Everything

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165 open issues indexed

feat: support `clonable` in the shadow option of @Component Open

Stencil v5

Difficulty 4/5 3-5 days Newbie friendliness 55/100

stenciljs/core#6833 · 2 comments · Opened Aug 18, 2026
bug: @stencil/store stops re-rendering components when the store is created from globalScript code (since 4.33.0) Open

Bug: Validated Stencil v5

Difficulty 4/5 3-5 days Newbie friendliness 48/100

stenciljs/core#6798 · 1 comment · 1 reaction · Opened Jul 31, 2026
feat: avoid re-evaluating the hydrate platform closure on every SSR render Open

Feature: Want this? Upvote it!

Difficulty 5/5 Over a week Newbie friendliness 25/100

stenciljs/core#6793 · 1 comment · 9 reactions · Opened Jul 27, 2026
feat: Docs dependencies should include Mixins Open

Feature: Want this? Upvote it!

Difficulty 4/5 3-5 days Newbie friendliness 48/100

stenciljs/core#6760 · 1 comment · 1 reaction · Opened Jun 29, 2026
feat(runtime): opt-out for per-prop componentShouldUpdate firing (4.42+) Open

Stencil v5

Difficulty 5/5 Over a week Newbie friendliness 35/100

stenciljs/core#6759 · 2 comments · Opened Jun 24, 2026
bug: incompatible value of this used for getters/setters during SSR hydration Open

Bug: Validated

Difficulty 3/5 1-2 days Newbie friendliness 58/100

stenciljs/core#6749 · Opened Jun 5, 2026
Streaming SSR: declarative shadow DOM conflicts with attachShadow in the constructor Open

Bug: Validated

Difficulty 4/5 3-5 days Newbie friendliness 45/100

stenciljs/core#6690 · 2 comments · Opened Apr 27, 2026
Stencil FOUC styles should use @layer to avoid cascade conflicts with React 19 Open

Stencil v5

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

stenciljs/core#6649 · Opened Mar 25, 2026
Using a StencilJS output in another StencilJS project Open

Stencil v5

Difficulty 5/5 Over a week Newbie friendliness 25/100

stenciljs/core#6641 · Opened Mar 16, 2026
feat: support for scoped custom element registries Open

Stencil v5

Difficulty 4/5 3-5 days Newbie friendliness 35/100

stenciljs/core#6638 · 7 reactions · Opened Mar 12, 2026
bug: Styles not rendered, gone from the DOM due to 3rd party framework interference (svelte/sveltekit) Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

stenciljs/core#6637 · 1 comment · Opened Mar 12, 2026
bug: component's child initial timing leads to unexpected behavior Open

Bug: Validated Stencil v5

Difficulty 4/5 3-5 days Newbie friendliness 25/100

stenciljs/core#6636 · 3 reactions · Opened Mar 11, 2026
bug: dist-custom-elements do not output global styles Open

Stencil v5

Difficulty 4/5 3-5 days Newbie friendliness 42/100

stenciljs/core#6630 · 2 comments · 1 reaction · Opened Mar 5, 2026
feat: support for `referenceTarget` shadow DOM feature Open

Feature: Want this? Upvote it! Stencil v5

Difficulty 4/5 3-5 days Newbie friendliness 42/100

stenciljs/core#6626 · 3 reactions · Opened Mar 3, 2026
bug: Jest 30 Support: Documentation Claims Support but Version Check Blocks It Open

Stencil v5

Difficulty 3/5 1-2 days Newbie friendliness 48/100

stenciljs/core#6599 · 1 comment · Opened Feb 16, 2026
v5 Breaking Changes Proposals / Discussion Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

stenciljs/core#6584 · 35 comments · 19 reactions · Opened Feb 4, 2026
feat: Upgrade to Node v24 Open

Stencil v5

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

stenciljs/core#6578 · Opened Feb 2, 2026
Problems with `@stencil/core@>4.38.3` + `@stencil/playwright@0.2.1` Open

ionitron: needs reproduction

Difficulty 4/5 3-5 days Newbie friendliness 38/100

stenciljs/core#6562 · 10 comments · Opened Jan 22, 2026
bug: Two-way binding broken between Angular template-driven forms and Stencil Open

ionitron: needs reproduction

Difficulty 4/5 3-5 days Newbie friendliness 42/100

stenciljs/core#6554 · 1 comment · 1 reaction · Opened Jan 16, 2026
feat: StencilJS MCP Server Open

Feature: Want this? Upvote it! Help Wanted

Difficulty 5/5 Over a week Newbie friendliness 25/100

stenciljs/core#6518 · 6 comments · 2 reactions · Opened Dec 30, 2025
chore: rename `cmp.test.tsx` files in `wdio` directory to have unique names for debugging purposes Open

Stencil v5

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

stenciljs/core#6407 · 3 comments · Opened Oct 2, 2025
Road to v5 🚀 Open

Stencil v5

Difficulty 5/5 Over a week Newbie friendliness 20/100

stenciljs/core#6185 · 21 comments · 27 reactions · Opened Mar 3, 2025
bug: e2e tests failing randomly Open

Bug: Validated Help Wanted ionitron: needs reproduction

Difficulty 4/5 3-5 days Newbie friendliness 30/100

stenciljs/core#6157 · 10 comments · Opened Feb 13, 2025
feat: add possibility for security SRI/integrity attribute Open

Help Wanted

Difficulty 5/5 Over a week Newbie friendliness 35/100

stenciljs/core#6132 · 1 comment · Opened Jan 30, 2025
bug: Slot-Fallback hidden when newlines exists Open

Request For Comments

Difficulty 3/5 1-2 days Newbie friendliness 35/100

stenciljs/core#6129 · 7 comments · Opened Jan 29, 2025
bug: Prop() is mutable despite what it says in the docs Open

Resolution: Refine

Difficulty 4/5 3-5 days Newbie friendliness 35/100

stenciljs/core#6006 · 3 comments · Opened Oct 2, 2024
bug: can't stop propagation of react synthetic events Open

Bug: Validated

Difficulty 4/5 3-5 days Newbie friendliness 32/100

stenciljs/core#5937 · 3 comments · 1 reaction · Opened Aug 12, 2024
bug: chrome crashes with "Aw, snap" message Open

Bug: Validated Has Workaround Help Wanted

Difficulty 4/5 3-5 days Newbie friendliness 25/100

stenciljs/core#5887 · 3 comments · Opened Jul 5, 2024
feat: Style modes load styles only when needed Open

Awaiting Reply Feature: Want this? Upvote it! Request For Comments

Difficulty 5/5 Over a week Newbie friendliness 35/100

stenciljs/core#5803 · 5 comments · 11 reactions · Opened May 31, 2024
bug: Removing polyfills except for es5 builds breaks existing installs Open

Bug: Validated Stencil v5

Difficulty 3/5 1-2 days Newbie friendliness 35/100

stenciljs/core#5780 · 17 comments · 1 reaction · Opened May 20, 2024
feature: allow to exclude components from rendering in E2E tests Open

Feature: Want this? Upvote it!

Difficulty 4/5 3-5 days Newbie friendliness 30/100

stenciljs/core#5717 · 9 comments · Opened Apr 29, 2024
feat: Remove mutable props concept Open

triage

stenciljs/core#5644 · 1 comment · 4 reactions · 1 assignee · Opened Apr 9, 2024
bug: SCSS doesn't rebuild when path is outside stencil directory Open

Bug: Validated

Difficulty 4/5 3-5 days Newbie friendliness 25/100

stenciljs/core#5599 · 11 comments · Opened Mar 28, 2024
bug: stencil build causes copyfile error and creates extra directory in monorepo Open

Bug: Validated

Difficulty 4/5 3-5 days Newbie friendliness 35/100

stenciljs/core#5486 · 3 comments · Opened Mar 15, 2024
feature: language server support for a richer editing experience for Stencil components Open

Awaiting Reply Feature: Want this? Upvote it! Request For Comments

Difficulty 4/5 3-5 days Newbie friendliness 32/100

stenciljs/core#5329 · 14 comments · 3 reactions · Opened Feb 5, 2024
bug: get undefined on updated State value on test when create page in beforeAll Open

Bug: Validated Has Workaround

Difficulty 3/5 1-2 days Newbie friendliness 35/100

stenciljs/core#5319 · 3 comments · Opened Feb 2, 2024
bug: Incorrect TypeScript typings for JSX Open

Bug: Validated Has Workaround Stencil v5

Difficulty 3/5 1-2 days Newbie friendliness 35/100

stenciljs/core#5306 · 10 comments · 4 reactions · Opened Jan 31, 2024
bug: UNRESOLVED_IMPORT when trying to import newrelic browser agent Open

Bug: Validated Has Workaround

Difficulty 3/5 1-2 days Newbie friendliness 25/100

stenciljs/core#5286 · 5 comments · Opened Jan 22, 2024
bug: Stencil can resolve incorrect jest-runner dependency when using pnpm Open

Bug: Validated

Difficulty 4/5 3-5 days Newbie friendliness 35/100

stenciljs/core#5196 · 1 comment · 2 reactions · Opened Dec 19, 2023
feat: include `values` inside the attributes when generating `docs-vscode`output target Open

Feature: Want this? Upvote it!

Difficulty 3/5 1-2 days Newbie friendliness 42/100

stenciljs/core#5014 · 4 comments · 3 reactions · Opened Nov 1, 2023
feat: change typedef output location for `dist-custom-elements` Open

Feature: Want this? Upvote it!

Difficulty 4/5 3-5 days Newbie friendliness 35/100

stenciljs/core#4628 · 3 comments · 3 reactions · Opened Jul 27, 2023
bug: Cannot test that events bubble out of the shadow DOM Open

Bug: Validated

Difficulty 4/5 3-5 days Newbie friendliness 35/100

stenciljs/core#4618 · 1 reaction · Opened Jul 25, 2023
feat: Configurable normalizeHref Open

Feature: Want this? Upvote it!

Difficulty 4/5 3-5 days Newbie friendliness 35/100

stenciljs/core#4584 · 2 comments · Opened Jul 17, 2023
feat: Enable Cooperative Intercept Mode for puppeteer E2E testing Open

Feature: Want this? Upvote it!

Difficulty 3/5 1-2 days Newbie friendliness 45/100

stenciljs/core#4504 · 4 reactions · Opened Jun 21, 2023
feat: Support Puppeteer launch options Open

Feature: Want this? Upvote it!

Difficulty 3/5 1-2 days Newbie friendliness 35/100

stenciljs/core#4498 · 3 comments · 8 reactions · Opened Jun 19, 2023
bug: build and test watcher influence each other Open

Bug: Validated

stenciljs/core#4477 · 1 comment · 1 reaction · 1 assignee · Opened Jun 13, 2023
feat: expose terser config Open

Feature: Want this? Upvote it!

Difficulty 4/5 3-5 days Newbie friendliness 45/100

stenciljs/core#4425 · 5 reactions · Opened May 25, 2023
feat: Support for mocking methods on Stencil components in unit tests Open

Feature: Want this? Upvote it!

stenciljs/core#4232 · 3 reactions · 1 assignee · Opened Apr 5, 2023
bug: top-level await issue Open

Bug: Validated

Difficulty 4/5 3-5 days Newbie friendliness 35/100

stenciljs/core#4231 · 7 comments · 2 reactions · Opened Apr 5, 2023
feat: Compatibility issue between Ember Glimmer VM and Stencil Open

Resolution: Refine

Difficulty 5/5 Over a week Newbie friendliness 25/100

stenciljs/core#4168 · 1 comment · Opened Mar 15, 2023

stenciljs/core

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