17 Commits (svelte@5.56.3)

Author	SHA1	Message	Date
Mathias Picker	27e74c4df7	docs: add auto-generated browser support page (#18276) ... ## Summary Adds a [Browser support](https://github.com/MathiasWP/svelte/blob/document-pipeline-draft/documentation/docs/07-misc/05-browser-support.md) page listing the minimum browser versions Svelte's runtime and compiler output require. The page (headline floor + per-feature requirements) is auto-generated by `packages/svelte/scripts/generate-browser-support.js`, which scans the code Svelte actually ships against the [web-features](https://github.com/web-platform-dx/web-features) Baseline dataset and resolves results to concrete browser versions via [baseline-browser-mapping](https://github.com/web-platform-dx/baseline-browser-mapping). CI fails if a PR moves the floor without regenerating the page. For 5.55.9 the floor is **Baseline 2020**: Chrome/Edge 87, Firefox 83, Safari 14. ## How it works 1. **Headline floor.** Each runtime entry from `pkg.exports` is bundled with rollup using production conditions, then walked with TypeScript's compiler API + TypeChecker. The walker (`browser-support.detector.js`) flags any web-features ID the runtime references; the highest Baseline year among them is the floor. 2. **Per-feature requirements.** Every user-facing surface is enumerated programmatically — every `bind:*` from `binding_properties`, every public subpackage export discovered via `pkg.exports` + `import * as ns`, every rune from `RUNES`, and directives (`transition:` / `animate:` / `use:` / `@attach` / `{@html}` / custom elements). Each gets a fixture, compiled and bundled like user code, then scanned. A row appears only when the fixture's floor exceeds the runtime floor. 3. **Supplemental rules.** A handful of APIs `web-features` doesn't catalogue (`getComputedStyle(...).zoom`, `box: 'device-pixel-content-box'`) are detected with the same type-aware walker via a small `register_extra_rules` list with inline justifications. 4. **Ignore sets.** `SAFE_TO_IGNORE` covers dataset bugs and feature-detected APIs with graceful fallbacks. `BEHAVIORAL_IGNORE` hides APIs reached only via specific user code from the headline (they still surface as conditional rows); staleness-checked, so CI fails if an entry no longer exists in the runtime. Resolves #18198. Provides an answer to the long-standing #558. ## Test plan - [ ] \`pnpm --filter svelte generate:browser-support\` regenerates the page idempotently - [ ] CI fails when a code change bumps the floor without regenerating the page - [ ] Page renders correctly on svelte.dev 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com> Co-authored-by: Rich Harris <rich.harris@vercel.com>	2 months ago
Rich Harris	e3d7f3986f	chore: update ESLint to v10 (#17670) ... * chore: update ESLint to v10 Update eslint and related plugins/configs. Bump CI lint job to Node 24 (ESLint 10 requires ^20.19.0 || ^22.13.0 || >=24). Replace removed Linter.FlatConfig type with Linter.Config. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * fix: address new `no-useless-assignment` violations from ESLint 10 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * dedupe --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>	5 months ago
7nik	9749ee869c	chore: add xhtml tests (#17597) ... * add xhtml tests * unused * tweak * more tests * tweak * we don't need to actually check the HTML - if it's malformed in SSR or mount, it will throw * same here * unused, so we can revert this * and this --------- Co-authored-by: Rich Harris <rich.harris@vercel.com>	5 months ago
Elliott Johnson	b8fd326d96	feat: async SSR (#16748) ... * feat: First pass at payload * first crack * snapshots * checkpoint * fix: cloning * add test option * big dumb * today's hard work; few tests left to fix * improve * tests passing no wayyyyy yo * lots of progress, couple of failing tests around selects * meh * solve async tree stuff * fix select/option stuff * whoop, tests * simplify * feat: hoisting * fix: `$effect.pending` sends updates to incorrect boundary * changeset * stuff from upstream * feat: first hydrationgaa * remove docs * snapshots * silly fix * checkpoint * meh * ALKASJDFALSKDFJ the test passes * chore: Update a bunch of tests for hydration markers * chore: remove snippet and is_async * naming * better errors for sync-in-async * test improvements * idk man * merge local branches (#16757) * use fragment as async hoist boundary * remove async_hoist_boundary * only dewaterfall when necessary * unused * simplify/fix * de-waterfall awaits in separate elements * update snapshots * remove unnecessary wrapper * fix * fix * remove suspends_without_fallback --------- Co-authored-by: Rich Harris <rich.harris@vercel.com> * Update payload.js Co-authored-by: Rich Harris <rich.harris@vercel.com> * checkpoint * got the extra children to go away * just gonna go ahead and merge this as the review comments take up too much space * chore: remove hoisted_promises (#16766) * chore: remove hoisted_promises * WIP optimise promises * WIP * fix <slot> with await in prop * tweak * fix type error * Update packages/svelte/src/compiler/phases/3-transform/server/visitors/SvelteHead.js * chore: fix hydration treeshaking (#16767) * chore: fix hydration treeshaking * fix * remove await_outside_boundary error (#16762) * chore: remove unused analysis.boundary (#16763) * chore: simplify slots (#16765) * chore: simplify slots * unused * Apply suggestions from code review * chore: remove metadata.pending (#16764) * Update packages/svelte/src/compiler/phases/3-transform/server/visitors/SnippetBlock.js * put this back where it was, keep the diff small * Update packages/svelte/src/compiler/phases/types.d.ts Co-authored-by: Rich Harris <rich.harris@vercel.com> * chore: remove analysis.state.title (#16771) * chore: remove analysis.state.title * unused * chore: remove is_async (#16769) * chore: remove is_async * unused * Apply suggestions from code review Co-authored-by: Rich Harris <rich.harris@vercel.com> * cleanup * lint * clean up payload a bit * compiler work * run ssr on sync and async * prettier * inline capture * Update packages/svelte/src/compiler/phases/3-transform/server/visitors/EachBlock.js * chore: simplify build_template (#16780) * small tweak to aid greppability * chore: fix SSR context (#16781) * at least passing * cleanup * fix * remove push/pop from exports, not needed with payload * I think this is better but tbh not sure * async SSR * qualification * errors: * I have lost the plot * finally * ugh * tweak error codes to better align with existing conventions, such as they are * tweak messages * remove unused args * DRY out a bit * unused * unused * unused * simplify - we can enforce readonly at a type level * unused * simplify * avoid magical accessors * simplify algorithm * unused * unused * reduce indirection * TreeState -> SSRState * mark deprecated methods * grab this.local from parent directly * rename render -> fn per conventions (fn indicates 'arbitrary code') * reduce indirection * Revert "reduce indirection" This reverts commit 3ec461baad. * tweak * okay works this time * no way chat, it works * fix context stuff * tweak * make it chainable * lint * clean up * lint * Update packages/svelte/src/internal/server/types.d.ts Co-authored-by: Rich Harris <rich.harris@vercel.com> * sunset html for async * types * we use 'deprecated' in other messages * oops --------- Co-authored-by: Rich Harris <rich.harris@vercel.com>	10 months ago
Ahmad S.	0ae1d5afff	chore: cleanup obselete stuff (#16412) ... * Update vitest.config.js * Update vitest.config.js * cleanup * woops * Update eslint.config.js --------- Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>	1 year ago
Ben McCann	c56914d739	chore: upgrade to eslint-plugin-svelte 3 (#16407)	1 year ago
Rich Harris	0672e48223	feat: allow `await` in components (#15844) ... * tidy * tidy * yes it can, apparently * tidy up * unused * complete merge * WIP * simplify * debugging help * WIP * unused * partial merge * WIP * fix * add test * rename * fix * unused * oops * chore: merge main into async branch (#16197) * chore: merge main into async branch * adjust test * fix: make effects depend on state created inside them (#16198) * make effects depend on state created inside them * fix, add github action * disable test in async mode * make batch.#deferred private * fix settled when awaits occur inside pending boundary * tweak * change behaviour of `tick()` to be requestAnimationFrame-based * get rid of a bunch of Promise.resolve chains * more * more * fix test * disallow `flushSync()` inside effects * regenerate * handle errors in block expressions * make validate_each_keys async-aware * for unowned deriveds, throw errors lazily * rename ASYNC_ERROR -> ERROR_VALUE, and avoid conflicts with other flags now that it's used with deriveds as well as sources * invoke boundary directly * local effect pending * update test * fix * fix * fix weird bug in tests * delete old changeset that somehow got left over here * Update .changeset/eleven-weeks-dance.md * update error details * unused * simplify * tweak * tweak * tweak * tweak * tidy up * handle errors in async block expressions * tweak * groundwork for async attribute_effect * dry out * fix async directives * tidy up * initialize option values before initing select values * simplify init_select * simplify * tweak * tidy up * tweak * on second thoughts just simplify it here * tidy * handle awaits in `<slot>` * unused * tidy up * tidy up * dry out * dry out * Revert "dry out" This reverts commit 25855163bf. * dry out * dry out * use let for block-scoped stuff * dry out * dry out * tidy up * only wrap awaits in `$.save` when necessary * oops * remove TODO comment (just checked) * oops, leftover * simplify * unused * remove logging * tweak * unused * unused * remove logging * partial fix * fix * remove unused EFFECT_HAS_DERIVED * Update packages/svelte/src/reactivity/create-subscriber.js Co-authored-by: Elliott Johnson <sejohnson@torchcloudconsulting.com> * Update packages/svelte/src/index-client.js Co-authored-by: Elliott Johnson <sejohnson@torchcloudconsulting.com> * Update packages/svelte/src/internal/client/runtime.js Co-authored-by: Elliott Johnson <sejohnson@torchcloudconsulting.com> * unused * Update packages/svelte/src/internal/client/reactivity/sources.js Co-authored-by: Elliott Johnson <sejohnson@torchcloudconsulting.com> * Update packages/svelte/src/internal/client/reactivity/deriveds.js Co-authored-by: Elliott Johnson <sejohnson@torchcloudconsulting.com> * Update packages/svelte/src/internal/client/reactivity/deriveds.js Co-authored-by: Elliott Johnson <sejohnson@torchcloudconsulting.com> * prettier * unused * fix flags * tweak * tweak * unused * fix * no idea what a 'boundary micro task' is or why it was deemed necessary but evidently it isn't * remove queue_boundary_micro_task * oops * note * tidy up * remove TODO * make method private * simplify * flesh out await_reactivity_loss warning * tweak * update test * fix * null out from_async_derived in more places * tidy up test * failing test * unused * fix test * fix * simplify. no idea what the async_mode_flag stuff is about, but it appears unnecessary * add async_derived_orphan error * regenerate * flesh out await_outside_boundary message * add some JSDoc * only update `$effect.pending()` if someone is listening, since it causes a double flush and makes debugging harder * tweak logic to make it clearer why and when we commit a batch * add a couple of comments * false -> 0 * add comment * unused * silence warning * add effect_pending_outside_reaction error * Update packages/svelte/src/compiler/types/index.d.ts Co-authored-by: Elliott Johnson <sejohnson@torchcloudconsulting.com> * suspend batch, not boundary * rename from_async_derived -> current_async_derived * tweak * remove TODO - this method is only called when pending snippet exists * use error boundary for test - vitest does some weird error swallowing afaict * flush less often * restore -> activate * remove TODO * move batch-related code into batch.js * make flush_queued_root_effects a method of batch * make process_effects a method of batch * make stuff private * unused * regenerate * update test * more JSDoc * add more JSDoc * branch and block effects do not also need to be render effects * tidy up * simplify * unused * move code where it belongs * remove, for now * fix * only apply error adjustments when error escapes boundaries * remove EFFECT_IS_UPDATING * is_dirty is a better name than check_dirtiness * duplicates are rare and harmless * apparently we no longer need the merging logic? we can simplify and fix stuff by removing it * tidy * don't commit stale batches * add skipped failing test * partial merge * WIP * WIP * WIP * tweak * tidy up * dont update derived status when time-travelling * tidy up * tidy up * tag async deriveds * tweak * bail out of secondary flushes * re-run blocks on subsequent flushes * add test * fix * add tests, one failing * fix * flesh out await_waterfall message * tidy up * dry out * unused * tweak * tidy up * TODO * tweak * tidy up * remove TODO * unused export * add optimisation back * revert unneeded changes * revert * update some tests * more * more * move some code * rename * WIP * unset context synchronously * remove unused argument * Apply suggestions from code review Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com> * add comment * add comment * use queue_micro_task in createSubscriber * Update packages/svelte/src/compiler/phases/3-transform/client/visitors/AwaitExpression.js Co-authored-by: Elliott Johnson <sejohnson@torchcloudconsulting.com> * prettier --------- Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com> Co-authored-by: Simon Holthausen <simon.holthausen@vercel.com> Co-authored-by: Elliott Johnson <sejohnson@torchcloudconsulting.com>	1 year ago
7nik	0b2b9c724f	chore: adjust linting (#16231) ... * chore: adjust linting * more nice treeshaking failure message * lint	1 year ago
Ben McCann	868ddb8441	docs: fix typo	2 years ago
Simon H	c4b721584a	chore: repo cleanup (#13029) ... * chore: cleanup repo configs - remove prettier from packages, everything runs through the root now (also better aligns with how you work with it in VS Code: no more config duplication needed) - remove eslint from packages, run it once through the root now (revealed some inconsistencies and missing stuff, config tightened up as a result) (bump eslint while we're at it) * update vite and related packages (since rollup includes an addition to one estree node we need to adjust code a bit) * bump more packages * bump jsdom * lint	2 years ago
Simon H	5eff68f63d	chore: runtime linting (#12314) ... - check that the runtime doesn't use methods that are too new - add linting rule to prevent references to the compiler in the runtime (this is important for the first check, else the ambient node typings would be included, which includes a definition for `at()`, which means we no longer would get errors when violating the "don't use new methods" rule in the runtime) - fix code as a result of these new checks closes #10438	2 years ago
Ben McCann	ca6e9b5745	chore: validate promise handling (#11842) ... * chore: don't swallow rejected promise errors * ignore rules rather than adding catch blocks. add async to functions returning promises * remove redundant asyncs * remove extremely pointless rule * remove another daft rule * this is what typescript is for * again, typescript already has this covered, we don't need it * simplify * this rule is harmless --------- Co-authored-by: Rich Harris <rich.harris@vercel.com>	2 years ago
Rich Harris	50a9020d00	reorder eslint ignores	2 years ago
Rich Harris	faa2e937ab	chore: exclude local playground from eslint (#11596)	2 years ago
Rich Harris	94b4268ce3	chore: markdown runtime errors/warnings (#11304) ... * chore: markdown runtime warnings * on second thoughts * start adding errors too * lint * centralise	2 years ago
Rich Harris	73490bbb8e	chore: markdown errors (#11294) ... * rename errors.js to errors-tmp.js * start porting errors * generate markdown files for more errors * convert parse errors * convert css errors * convert special_element errors * convert runes errors * convert element errors * more * more * more * more * more * more * fix some tests * fix some tests * more tests * remove unused error * prettierignore * weird * ugh * lint	2 years ago
Jeremiasz Major	0cf2e98322	chore: upgrade eslint to v9 (#11108)	2 years ago