<s>
NativeScript	B-Language
is	O
an	O
open-source	B-Application
framework	O
to	O
develop	O
mobile	B-Application
apps	I-Application
on	O
the	O
Apple	B-Application
iOS	I-Application
and	O
Android	B-Application
platforms	I-Application
.	O
</s>
<s>
At	O
the	O
end	O
of	O
2019	O
responsibility	O
for	O
the	O
NativeScript	B-Language
project	O
was	O
taken	O
over	O
by	O
long-time	O
Progress	O
partner	O
,	O
nStudio	O
.	O
</s>
<s>
In	O
December	O
2020	O
nStudio	O
also	O
oversaw	O
the	O
induction	O
of	O
NativeScript	B-Language
into	O
OpenJS	O
Foundation	O
as	O
an	O
Incubating	O
Project	O
.	O
</s>
<s>
NativeScript	B-Language
apps	O
are	O
built	O
using	O
JavaScript	B-Language
,	O
or	O
by	O
using	O
any	O
programming	O
language	O
that	O
transpiles	B-Language
to	O
JavaScript	B-Language
,	O
such	O
as	O
TypeScript	B-Language
.	O
</s>
<s>
NativeScript	B-Language
supports	O
the	O
Angular	B-Language
and	O
Vue	B-Language
JavaScript	B-Language
frameworks	O
.	O
</s>
<s>
Mobile	B-Application
applications	I-Application
built	O
with	O
NativeScript	B-Language
result	O
in	O
fully	O
native	O
apps	O
,	O
which	O
use	O
the	O
same	O
APIs	O
as	O
if	O
they	O
were	O
developed	O
in	O
Xcode	B-Operating_System
or	O
Android	B-Application
Studio	I-Application
.	O
</s>
<s>
Additionally	O
,	O
software	O
developers	O
can	O
re-purpose	O
third-party	O
libraries	O
from	O
CocoaPods	B-Application
,	O
Maven	B-Language
,	O
and	O
npm.js	B-Language
in	O
their	O
mobile	B-Application
applications	I-Application
without	O
the	O
need	O
for	O
wrappers	O
.	O
</s>
<s>
NativeScript	B-Language
was	O
publicly	O
released	O
first	O
in	O
March	O
2015	O
.	O
</s>
<s>
The	O
use	O
of	O
Angular	B-Language
is	O
an	O
optional	O
development	O
approach	O
allowing	O
for	O
application	O
source	O
code	O
to	O
be	O
shared	O
between	O
the	O
web	O
platform	O
and	O
mobile	O
platform	O
.	O
</s>
<s>
NativeScript	B-Language
and	O
all	O
the	O
required	O
plugins	O
are	O
installed	O
using	O
the	O
package	O
manager	O
npm	B-Language
.	O
</s>
<s>
Projects	O
are	O
created	O
,	O
configured	O
,	O
and	O
compiled	O
via	O
the	O
command	O
line	O
or	O
a	O
GUI	B-Application
tool	O
called	O
NativeScript	B-Language
Sidekick	O
.	O
</s>
<s>
Platform-independent	B-Operating_System
user	O
interfaces	O
are	O
defined	O
using	O
XML	B-Protocol
files	O
.	O
</s>
<s>
NativeScript	B-Language
then	O
uses	O
the	O
abstractions	O
described	O
in	O
the	O
XML	B-Protocol
files	O
to	O
call	O
native	O
UI	O
elements	O
of	O
each	O
platform	O
.	O
</s>
<s>
Application	O
logic	O
developed	O
in	O
Angular	B-Language
and	O
TypeScript	B-Language
can	O
be	O
developed	O
independent	O
of	O
the	O
target	O
platform	O
as	O
well	O
.	O
</s>
<s>
A	O
NativeScript	B-Language
mobile	B-Application
application	I-Application
is	O
built	O
using	O
the	O
node.js	O
runtime	O
and	O
tooling	O
.	O
</s>
<s>
Progress	O
aims	O
for	O
a	O
ratio	O
of	O
90%	O
common	O
code	O
between	O
the	O
iOS	B-Application
and	O
Android	B-Application
platforms	I-Application
.	O
</s>
<s>
Platform-independent	B-Operating_System
user	O
interfaces	O
are	O
defined	O
using	O
XML	B-Protocol
files	O
.	O
</s>
<s>
NativeScript	B-Language
uses	O
the	O
XML	B-Protocol
data	O
structures	O
representing	O
the	O
cross	B-Operating_System
platform	I-Operating_System
abstraction	O
to	O
trigger	O
platform-specific	O
code	O
that	O
directly	O
interacts	O
with	O
the	O
native	O
elements	O
of	O
the	O
target	O
operating	O
system	O
.	O
</s>
<s>
This	O
means	O
a	O
call	O
to	O
the	O
NativeScript	B-Language
Button	O
API	O
provides	O
a	O
UI	O
abstraction	O
for	O
Button	O
,	O
which	O
directly	O
calls	O
UIButton	O
on	O
iOS	B-Application
or	O
com.android.widget.Button	O
on	O
Android	B-Application
.	O
</s>
<s>
While	O
application	O
source	O
code	O
is	O
written	O
in	O
JavaScript	B-Language
,	O
TypeScript	B-Language
,	O
Angular	B-Language
,	O
or	O
Vue.js	B-Language
,	O
the	O
source	O
code	O
is	O
not	O
compiled	O
or	O
otherwise	O
mutated	O
.	O
</s>
<s>
This	O
architectural	O
choice	O
eliminates	O
the	O
need	O
for	O
cross-compiling	O
or	O
transpiling	B-Language
.	O
</s>
<s>
Additionally	O
,	O
while	O
the	O
application	O
source	O
code	O
is	O
written	O
in	O
languages	O
commonly	O
encountered	O
in	O
a	O
browser	O
(	O
or	O
in	O
a	O
WebView-contained	O
mobile	B-Application
application	I-Application
)	O
NativeScript	B-Language
applications	O
run	O
directly	O
on	O
the	O
native	O
device	O
.	O
</s>
<s>
Rather	O
than	O
requiring	O
separate	O
binding	O
layers	O
between	O
NativeScript	B-Language
and	O
each	O
mobile	O
platform	O
API	O
,	O
NativeScript	B-Language
uses	O
reflection	O
to	O
gain	O
information	O
and	O
metadata	O
about	O
the	O
native	O
platform	O
APIs	O
.	O
</s>
<s>
As	O
JavaScript	B-Language
(	O
or	O
TypeScript/Angular	O
)	O
can	O
talk	O
directly	O
to	O
native	O
code	O
,	O
there	O
is	O
no	O
need	O
to	O
write	O
binding	O
layers	O
in	O
Objective-C	O
,	O
Swift	O
,	O
Java	O
or	O
Kotlin	O
.	O
</s>
<s>
With	O
the	O
launch	O
of	O
NativeScript	B-Language
2.0	O
,	O
it	O
is	O
possible	O
to	O
use	O
Angular	B-Language
to	O
build	O
cross-platform	B-Operating_System
mobile	B-Application
applications	I-Application
.	O
</s>
<s>
Additionally	O
,	O
when	O
using	O
Angular	B-Language
with	O
NativeScript	B-Language
you	O
have	O
the	O
ability	O
to	O
share	O
large	O
chunks	O
of	O
code	O
between	O
your	O
web	O
and	O
mobile	B-Application
apps	I-Application
.	O
</s>
<s>
The	O
Vue.js	B-Language
framework	O
is	O
supported	O
in	O
NativeScript	B-Language
via	O
the	O
nativescript-vue	O
plugin	O
.	O
</s>
<s>
NativeScript	B-Language
Sidekick	O
is	O
a	O
graphical	B-Application
user	I-Application
interface	I-Application
that	O
builds	O
off	O
of	O
the	O
capabilities	O
provided	O
by	O
the	O
NativeScript	B-Language
CLI	O
.	O
</s>
<s>
With	O
Sidekick	O
a	O
developer	O
can	O
leverage	O
app	O
templates	O
,	O
cloud-based	O
builds	O
for	O
iOS	B-Application
and	O
Android	B-Application
,	O
and	O
publish	O
apps	O
to	O
the	O
public	O
app	O
stores	O
.	O
</s>
<s>
NativeScript	B-Language
Playground	O
allows	O
developers	O
to	O
experiment	O
with	O
NativeScript	B-Language
in	O
a	O
web-based	O
environment	O
,	O
and	O
preview	O
apps	O
on	O
physical	O
devices	O
.	O
</s>
<s>
NativeScript	B-Language
Marketplace	O
is	O
a	O
curated	O
source	O
of	O
NativeScript	B-Language
plugins	O
,	O
pre-built	O
app	O
templates	O
,	O
and	O
runnable	O
sample	O
apps	O
.	O
</s>
