Combo fixtures
A language with this many constructs cannot be tested one node per file. Combinations are where the owner of a {#if}, the absorption of a {#each}, and the seed of a bind:value share a construct() and fight over a field name. The engine’s src-svelte/lib/Combo*.svelte files exist so those fights happen in a golden, not in your admin page. Compile drops them into the workspace. They are not your application. Application routes belong in the project src/.
ClickField.svelte is the teaching example: lang=d, on:click, {msg}. IfToggle.svelte is {#if} / plus this.update.open. Everything after that is a stack.
Combo.svelte puts {#if} / {:else if} / around several consequent children (a <p>, a {@html}, a {#each}), each item taken from a real <li> (class:, static attr, {item}, index), plus <slot> fallback, {#await} pending/then/catch, <ClickField msg="hi" />, and bind:value + class: + id={} on one input. The printer must walk every walkable child, attach every new @child to the same @visible bool, and share one construct() for puts and prop assigns.
ComboMore.svelte is the next official batch: {#snippet} + {@render}, bind:this, bind:group, {@const} / {@debug}, {#key} remount!, <svelte:window on:keydown|preventDefault>, and runes rewritten onto fields plus onMount. ComboNext.svelte is special elements and leftover directives: static <svelte:element>, use:, transition:, spread, fragment, <svelte:component>, {@attach}, in:/out:/animate:, boundary fallback. ComboRest.svelte is options, head, {let}, each index+key, slot let:, svelte:self. ComboCss.svelte is <style> / addCss, live style: concat, dynamic svelte:element, Handle spread.
ComboForm.svelte is textarea/select bind:value, bind:innerHTML, details bind:open, valueless disabled, class:on, on:click|once plus on:keydown on one button. ComboMedia.svelte is SVG/video/ARIA, on:click|self|trusted, boundary plus throwBoundary. ComboWide.svelte is {#if !off}, MathML, dialog/audio/progress/canvas/iframe, custom element, svelte:document / body. ComboExpr.svelte is a && b, await-then {v}, snippet args, destructure each, form on:submit via nodeHandle, table, bind:clientWidth. ComboOr.svelte is a || b, await then+catch, named slot, bind:scrollY, picture/fieldset, :global. ComboMisc.svelte is n > 0, bind:files, datalist/ruby/map, style:--accent, drag. ComboSem.svelte is (ready && ok), who == extra, pair(a,b), bind:this on a component, landmarks. ComboNest.svelte is on && !hide, each+if li, [x, y], bind:indeterminate. ComboIfCmp.svelte is the ten-way {#if it.n ? on} table. ComboSurf, ComboCover, and ComboIfHost carry further each-if and host-if mixes.
When you add a construct, add it to a Combo (or a new one) and to this page. A one-off fixture per node is how combinations stop being tested. The official AST in svelte-ref-impl is the spec of record for what a .svelte file may contain; these Combos are the spec of record for what svelte-d prints when those nodes share a tree.