<s>
Svelte	B-Language
is	O
a	O
free	B-License
and	I-License
open-source	I-License
front	B-Architecture
end	I-Architecture
component	O
framework	O
or	O
language	O
created	O
by	O
Rich	O
Harris	O
and	O
maintained	O
by	O
the	O
Svelte	B-Language
core	O
team	O
members	O
.	O
</s>
<s>
Svelte	B-Language
is	O
not	O
a	O
monolithic	O
JavaScript	B-Language
library	I-Language
imported	O
by	O
applications	O
:	O
instead	O
,	O
Svelte	B-Language
compiles	B-Language
HTML	B-Language
templates	O
to	O
specialized	O
code	O
that	O
manipulates	O
the	B-General_Concept
DOM	I-General_Concept
directly	O
,	O
which	O
may	O
reduce	O
the	O
size	O
of	O
transferred	O
files	O
and	O
give	O
better	O
client	O
performance	O
.	O
</s>
<s>
Application	O
code	O
is	O
also	O
processed	O
by	O
the	O
compiler	B-Language
,	O
inserting	O
calls	O
to	O
automatically	O
recompute	O
data	O
and	O
re-render	O
UI	O
elements	O
when	O
the	O
data	O
they	O
depend	O
on	O
is	O
modified	O
.	O
</s>
<s>
This	O
also	O
avoids	O
the	O
overhead	O
associated	O
with	O
runtime	O
intermediate	O
representations	O
,	O
such	O
as	O
virtual	B-General_Concept
DOM	I-General_Concept
,	O
unlike	O
traditional	O
frameworks	O
(	O
such	O
as	O
React	B-Application
and	O
Vue	B-Language
)	O
which	O
carry	O
out	O
the	O
bulk	O
of	O
their	O
work	O
at	O
runtime	O
,	O
i.e.	O
</s>
<s>
The	O
compiler	B-Language
itself	O
is	O
written	O
in	O
TypeScript	B-Language
.	O
</s>
<s>
Its	O
source	O
code	O
is	O
licensed	O
under	O
MIT	B-License
License	I-License
and	O
hosted	O
on	O
GitHub	B-Application
.	O
</s>
<s>
The	O
predecessor	O
of	O
Svelte	B-Language
is	O
Ractive.js	B-Language
,	O
which	O
Rich	O
Harris	O
had	O
developed	O
earlier	O
.	O
</s>
<s>
Version	O
1	O
of	O
Svelte	B-Language
was	O
written	O
in	O
JavaScript	B-Language
and	O
was	O
released	O
on	O
29	O
November	O
2016	O
.	O
</s>
<s>
It	O
was	O
basically	O
Ractive	B-Language
with	O
a	O
compiler	B-Language
.	O
</s>
<s>
The	O
name	O
Svelte	B-Language
was	O
chosen	O
by	O
Rich	O
Harris	O
and	O
his	O
coworkers	O
at	O
The	O
Guardian	O
.	O
</s>
<s>
Version	O
2	O
of	O
Svelte	B-Language
was	O
released	O
on	O
19	O
April	O
2018	O
.	O
</s>
<s>
Version	O
3	O
of	O
Svelte	B-Language
is	O
written	O
in	O
TypeScript	B-Language
and	O
was	O
released	O
on	O
21	O
April	O
2019	O
.	O
</s>
<s>
It	O
rethought	O
reactivity	O
by	O
using	O
the	O
compiler	B-Language
to	O
instrument	O
assignments	O
behind	O
the	O
scenes	O
.	O
</s>
<s>
The	O
SvelteKit	B-Language
web	B-Application
framework	I-Application
was	O
announced	O
in	O
October	O
2020	O
and	O
entered	O
beta	O
in	O
March	O
2021	O
.	O
</s>
<s>
Key	O
early	O
contributors	O
became	O
involved	O
with	O
Conduitry	O
joining	O
with	O
the	O
release	O
of	O
Svelte	B-Language
1	O
,	O
Tan	O
Li	O
Hau	O
joining	O
in	O
2019	O
,	O
and	O
Ben	O
McCann	O
joining	O
in	O
2020	O
.	O
</s>
<s>
Rich	O
Harris	O
and	O
Simon	O
Holthausen	O
joined	O
Vercel	B-General_Concept
to	O
work	O
on	O
Svelte	B-Language
fulltime	O
in	O
2022	O
.	O
</s>
<s>
SvelteKit	B-Language
1.0	O
was	O
released	O
in	O
December	O
2022	O
after	O
two	O
years	O
in	O
development	O
.	O
</s>
<s>
Svelte	B-Language
applications	O
and	O
components	O
are	O
defined	O
in	O
files	O
,	O
which	O
are	O
HTML	B-Language
files	I-Language
extended	O
with	O
templating	O
syntax	O
that	O
is	O
based	O
on	O
JavaScript	B-Language
and	O
is	O
similar	O
to	O
JSX	B-Language
.	O
</s>
<s>
Svelte	B-Language
repurposes	O
JavaScript	B-Language
's	O
native	O
labeled	O
statement	O
syntax	O
to	O
mark	O
reactive	B-Architecture
statements	O
.	O
</s>
<s>
Additionally	O
,	O
the	O
{	O
}	O
syntax	O
can	O
be	O
used	O
for	O
templating	O
in	O
HTML	B-Language
elements	O
and	O
components	O
,	O
which	O
is	O
shown	O
below	O
:	O
</s>
<s>
The	O
Svelte	B-Language
maintainers	O
created	O
SvelteKit	B-Language
as	O
the	O
official	O
way	O
to	O
build	O
projects	O
with	O
Svelte	B-Language
.	O
</s>
<s>
It	O
is	O
a	O
Next.js-style	O
framework	O
that	O
dramatically	O
reduces	O
the	O
amount	O
of	O
code	O
that	O
gets	O
sent	O
to	O
the	O
browser	O
.	O
</s>
<s>
The	O
maintainers	O
had	O
previously	O
created	O
Sapper	B-Language
,	O
which	O
was	O
the	O
predecessor	O
of	O
SvelteKit	B-Language
.	O
</s>
<s>
The	O
Svelte	B-Language
maintainers	O
also	O
maintain	O
a	O
number	O
of	O
integrations	O
for	O
popular	O
software	O
projects	O
under	O
the	O
Svelte	B-Language
organization	O
including	O
integrations	O
for	O
Vite	O
,	O
Rollup	O
,	O
Webpack	B-Language
,	O
TypeScript	B-Language
,	O
VS	O
Code	O
,	O
Chrome	O
Developer	O
Tools	O
,	O
ESLint	B-Language
,	O
and	O
prettier	O
.	O
</s>
<s>
A	O
number	O
of	O
external	O
projects	O
such	O
as	O
Storybook	O
have	O
also	O
created	O
integrations	O
with	O
Svelte	B-Language
and	O
SvelteKit	B-Language
.	O
</s>
<s>
Vue.js	B-Language
modeled	O
its	O
API	O
and	O
single-file	O
components	O
after	O
Ractive.js	B-Language
,	O
the	O
predecessor	O
of	O
Svelte	B-Language
.	O
</s>
<s>
Svelte	B-Language
is	O
widely	O
praised	O
by	O
developers	O
.	O
</s>
<s>
Taking	O
the	O
top	O
ranking	O
in	O
multiple	O
large	O
scale	O
developer	O
surveys	O
,	O
it	O
was	O
chosen	O
as	O
the	O
Stack	B-Error_Name
Overflow	I-Error_Name
2021	O
most	O
loved	O
web	B-Application
framework	I-Application
and	O
2020	O
State	O
of	O
JS	O
frontend	B-Architecture
framework	O
with	O
the	O
most	O
satisfied	O
developers	O
.	O
</s>
<s>
Svelte	B-Language
has	O
been	O
adopted	O
by	O
a	O
number	O
of	O
high-profile	O
web	O
companies	O
including	O
The	O
New	O
York	O
Times	O
,	O
Apple	O
,	O
Spotify	B-Application
,	O
Square	O
,	O
Yahoo	B-Application
,	O
ByteDance	O
,	O
Rakuten	O
,	O
Bloomberg	O
,	O
Reuters	O
,	O
Ikea	O
,	O
Facebook	B-Application
,	O
and	O
Brave	B-Application
.	O
</s>
<s>
A	O
community	O
group	O
of	O
non-maintainers	O
run	O
the	O
Svelte	B-Language
Summit	O
conference	O
,	O
write	O
a	O
Svelte	B-Language
newsletter	O
,	O
host	O
a	O
Svelte	B-Language
podcast	O
,	O
and	O
host	O
a	O
directory	O
of	O
Svelte	B-Language
tooling	O
,	O
components	O
,	O
and	O
templates	O
.	O
</s>
