What agents should know before contributing

sveltejs/svelte

web development for the rest of us

Read by Bluet from 2 files written for agents and 300 merged pull requests on 2026-09-25. Not reviewed by the maintainers.

Rules its files tell agents (2)

shouldDon't take this personally if this happens, and feel free to open a new issue once you've gathered all the inf…
When opening a new issue, always make sure to fill out the issue template. This step is very important! Not doing so may result in your issue not being managed in a timely fashion. Don't take this personally if this happens, and feel free to open a new issue once you've gathered all the information required by the template.
CONTRIBUTING.md
shouldDO NOT submit a PR without running the full test suite.
When submitting a PR, you MUST read PULL_REQUEST_TEMPLATE.md and fill it out correctly. DO NOT submit a PR without running the full test suite.
AGENTS.md

Decisions its pull requests settled (40)

#18147account for proxified instance when updating `bind:this`
#18075handle parens in template expressions more robustly
#18181wait with resolving prior batches until current one commits
#18180leave stale promises to wait for a later resolution, instead of rejecting
#18167resolve stale deriveds with latest value
#18196remove `source.updated` stack traces after `flush`
#18218keep dependencies of `$state.eager`/`pending` (alternative approach)
#18205treat batches as a linked list
#18303prevent batch unlinking twice
#18263make unnecessary commit work less likely
#18238use named symbols everywhere
#18226clarify context state getter pattern
#18345set input type before spread value
#18330don't mistake `type` identifier expressions for TS `type` declarations in tags
#18320deduplicate identical hoisted templates within a component
#18430avoid NaN keyframe values in slide transition
#18400abort deriveds own AbortSignal when it disconnects
#18425make `SvelteURLSearchParams` notifications accurate
#18477clarify $bindable fallback binding requirement
#18431don't resurrect outroing elements when an ancestor block is paused and resumed
#18466distinct memoizer on style/class directives
#18521transform computed keys in keyed each block destructuring patterns
#18533block declaration tags on async values read inside closures
#18525skip unnecessary derived effect in earlier batch
#18540avoid css tree-shaking for exported Snippet
#18541clear previous_task reference after abort in Tween
#18534clarify when `$effect.pre` runs relative to DOM updates
#18556call `onerror` and provide a working `reset` when hydrating a failed boundary
#18569release last_propagated_event after event propagation settles
#18550in non-async mode, only push variable to current_sources when active_reaction is updating
#18594preserve logical assignments to private state fields
#18597note that transitions bypass CSS prefers-reduced-motion
#18613treat concise arrow function bodies as implicit returns when calculating blockers
#18581clarify that context lookup includes the current component and all ancestors
#18618remove stale capture listeners from spread attributes
#18614append_styles resolving to `document.head` in WC
#18616preserve renderer type in copy() during SSR
#18620give effect teardowns the value from before the first write in a flush
#18625skip controlled each fast path while another batch is pending
#18634apply CSS custom properties with falsy values on components

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