<s>
AtScript	B-Language
was	O
a	O
proposed	O
JavaScript-based	O
scripting	B-Language
language	I-Language
extending	O
Microsoft	O
's	O
TypeScript	B-Language
and	O
transcompiling	B-Language
to	O
JavaScript	B-Language
.	O
</s>
<s>
It	O
was	O
introduced	O
in	O
October	O
2014	O
at	O
the	O
ng-Europe	O
conference	O
by	O
the	O
developers	O
of	O
Google	B-Application
's	I-Application
AngularJS	B-Application
web	O
development	O
framework	O
as	O
the	O
language	O
that	O
the	O
upcoming	O
Angular	O
2.0	O
would	O
be	O
built	O
with	O
.	O
</s>
<s>
AtScript	B-Language
was	O
originally	O
intended	O
to	O
run	O
on	O
top	O
of	O
TypeScript	B-Language
,	O
while	O
including	O
some	O
features	O
from	O
Dart	B-Language
.	O
</s>
<s>
In	O
October	O
2014	O
,	O
Google	B-Application
announced	O
that	O
Angular	O
2.0	O
would	O
be	O
written	O
in	O
AtScript	B-Language
.	O
</s>
<s>
In	O
March	O
2015	O
,	O
Microsoft	O
announced	O
that	O
many	O
of	O
AtScript	B-Language
's	O
features	O
would	O
be	O
implemented	O
in	O
the	O
TypeScript	B-Language
1.5	O
release	O
,	O
and	O
that	O
Angular	O
2.0	O
would	O
be	O
built	O
on	O
pure	O
TypeScript	B-Language
.	O
</s>
<s>
The	O
name	O
“	O
AtScript	B-Language
”	O
comes	O
from	O
the	O
@	O
“	O
at	O
”	O
symbol	O
used	O
for	O
annotations	O
in	O
many	O
languages	O
(	O
e.g.	O
</s>
<s>
Java	B-Language
annotations	I-Language
and	O
Python	O
decorators	O
)	O
.	O
</s>
