* no `?? ''` on some expressions

* changeset

* delete operator returns boolean

* inverted conditions are a lil confusing

* no need for else after return

* simplify condition

* may as well add special handling for undefined while we're here

* use normal string literal when there are no values

* omit assignment when there is no text content

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Co-authored-by: Rich Harris <rich.harris@vercel.com>

* chore: make Binding a class

* reorder

* regenerate

* set_class with class: directives

* update expected result (remove leading space)

* fix

* optimize literals

* add test

* add test for mutations on hydration

* clean observer

* Update packages/svelte/src/compiler/phases/3-transform/client/visitors/RegularElement.js

unused

Co-authored-by: Rich Harris <hello@rich-harris.dev>

* Update packages/svelte/src/compiler/phases/3-transform/client/visitors/RegularElement.js

unused for now

Co-authored-by: Rich Harris <hello@rich-harris.dev>

* Update packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/element.js

unused for now

Co-authored-by: Rich Harris <hello@rich-harris.dev>

* Update packages/svelte/src/compiler/phases/3-transform/server/visitors/shared/element.js

nit

Co-authored-by: Rich Harris <hello@rich-harris.dev>

* Update packages/svelte/src/internal/client/dom/elements/attributes.js

nit

Co-authored-by: Rich Harris <hello@rich-harris.dev>

* Update packages/svelte/src/internal/shared/attributes.js

rename clazz to value :D

Co-authored-by: Rich Harris <hello@rich-harris.dev>

* remove unused + fix JSDoc

* drive-by fix

* minor style tweaks

* tweak test

* this is faster

* tweak

* tweak

* this is faster

* typo

* tweak

* changeset

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Co-authored-by: Rich Harris <hello@rich-harris.dev>
Co-authored-by: Rich Harris <rich.harris@vercel.com>

* Version Packages

* tweak

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Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Rich Harris <rich.harris@vercel.com>