<s>
Amber	B-Language
Smalltalk	I-Language
,	O
formerly	O
named	O
Jtalk	O
,	O
is	O
an	O
implementation	O
of	O
the	O
programming	O
language	O
Smalltalk-80	B-Application
,	O
that	O
runs	O
on	O
the	O
JavaScript	B-Language
runtime	O
of	O
a	O
web	B-Application
browser	I-Application
.	O
</s>
<s>
It	O
is	O
designed	O
to	O
enable	O
client-side	O
development	O
using	O
Smalltalk	B-Application
.	O
</s>
<s>
The	O
programming	B-Application
environment	I-Application
in	O
Amber	O
is	O
named	O
Helios	O
.	O
</s>
<s>
Amber	O
includes	O
an	O
integrated	B-Application
development	I-Application
environment	I-Application
(	O
IDE	B-Application
)	O
with	O
a	O
class	B-Application
browser	I-Application
,	O
Workspace	O
,	O
transcript	O
,	O
object	O
inspector	O
,	O
and	O
debugger	B-Application
.	O
</s>
<s>
Amber	O
is	O
written	O
in	O
itself	O
(	O
is	O
self-hosting	O
)	O
,	O
including	O
the	O
compiler	B-Language
,	O
and	O
compiles	B-Language
into	O
JavaScript	B-Language
,	O
mapping	O
one-to-one	O
with	O
the	O
JavaScript	B-Language
equivalent	O
.	O
</s>
<s>
This	O
one-to-one	O
mapping	O
with	O
JavaScript	B-Language
differentiates	O
Amber	O
from	O
other	O
Smalltalk	B-Application
variants	O
such	O
as	O
Pharo	B-Language
,	O
Seaside	B-Application
,	O
and	O
Squeak	B-Operating_System
.	O
</s>
<s>
Developing	O
Amber	O
project	O
requires	O
Node.js	B-Language
to	O
run	O
the	O
tooling	O
;	O
the	O
deployed	O
project	O
only	O
needs	O
browser	B-Application
to	O
run	O
.	O
</s>
<s>
Amber	O
does	O
n't	O
run	O
slowly	O
on	O
a	O
bytecode	O
virtual	B-Architecture
machine	I-Architecture
due	O
to	O
its	O
convenient	O
mapping	O
to	O
JavaScript	B-Language
,	O
which	O
makes	O
compiled	B-Language
code	O
run	O
fast	O
.	O
</s>
<s>
Amber	O
was	O
influenced	O
by	O
an	O
earlier	O
Smalltalk	B-Application
in	O
browser	B-Application
project	O
,	O
named	O
Clamato	O
,	O
created	O
by	O
Avi	O
Bryant	O
.	O
</s>
<s>
Amber	O
and	O
Clamato	O
both	O
use	O
parsing	O
expression	O
grammar	O
(	O
PEG	O
)	O
libraries	B-Library
to	O
parse	O
Smalltalk	B-Application
source	O
code	O
.	O
</s>
<s>
Amber	O
uses	O
the	O
JavaScript	B-Language
based	O
PEG.js	O
library	O
written	O
by	O
David	O
Majda	O
.	O
</s>
<s>
Clamato	O
uses	O
PetitParser	O
,	O
a	O
Smalltalk-based	O
library	O
written	O
by	O
Lukas	O
Renggli	O
.	O
</s>
<s>
Clamato	O
and	O
Amber	O
were	O
both	O
influenced	O
by	O
earlier	O
work	O
by	O
Dan	O
Ingalls	O
in	O
developing	O
the	O
Lively	B-Language
Kernel	I-Language
implementation	O
of	O
Morphic	O
to	O
run	O
in	O
web	B-Application
browsers	I-Application
via	O
JavaScript	B-Language
.	O
</s>
<s>
Starting	O
with	O
version	O
0.12.0	O
,	O
Amber	O
modules	O
compile	B-Language
to	O
asynchronous	B-Language
module	I-Language
definition	I-Language
(	O
AMD	O
)	O
.	O
</s>
<s>
Starting	O
with	O
version	O
0.12.6	O
,	O
the	O
development	O
helper	O
command-line	B-Application
interface	I-Application
(	O
CLI	O
)	O
tool	O
is	O
extracted	O
to	O
dedicated	O
module	O
,	O
which	O
can	O
be	O
installed	O
from	O
npm	B-Language
as	O
@ambers	O
/cli	O
;	O
and	O
setting	O
up	O
the	O
project	O
and	O
its	O
JavaScript	B-Language
ecosystem	O
(	O
npm	B-Language
,	O
grunt	O
)	O
is	O
greatly	O
simplified	O
using	O
this	O
CLI	O
tool	O
by	O
issuing	O
amber	O
init	O
and	O
answering	O
a	O
few	O
questions	O
.	O
</s>
<s>
Since	O
August	O
2018	O
,	O
project	O
scaffolding	O
of	O
"	O
amber	O
init	O
"	O
is	O
simplified	O
,	O
not	O
using	O
bower	O
any	O
more	O
and	O
only	O
based	O
on	O
npm	B-Language
and	O
whole	O
project	O
resides	O
under	O
npm	B-Language
organization	O
@ambers	O
.	O
</s>
<s>
This	O
makes	O
setting	O
Amber	B-Language
Smalltalk	I-Language
easier	O
for	O
people	O
with	O
little	O
JavaScript	B-Language
experience	O
.	O
</s>
<s>
To	O
install	O
Amber	O
,	O
Git	B-Application
must	O
be	O
installed	O
first	O
,	O
if	O
it	O
is	O
not	O
already	O
.	O
</s>
<s>
After	O
that	O
,	O
typing	O
http://localhost:4000	O
in	O
the	O
browser	B-Application
will	O
get	O
to	O
the	O
application	O
.	O
</s>
<s>
Most	O
browsers	B-Application
will	O
block	O
Helios	O
IDE	B-Application
pop-ups	O
by	O
default	O
,	O
so	O
browser	B-Application
settings	O
may	O
need	O
changing	O
to	O
allow	O
the	O
Helios	O
IDE	B-Application
popup	O
to	O
appear	O
.	O
</s>
<s>
Npm	B-Language
software	O
can	O
be	O
used	O
to	O
access	O
a	O
vast	O
array	O
of	O
JavaScript	B-Language
libraries	B-Library
.	O
</s>
<s>
Install	O
the	O
library	O
using	O
npm	B-Language
.	O
</s>
<s>
If	O
'	O
local.amd.json	O
'	O
files	O
does	O
n't	O
exist	O
for	O
the	O
npm	B-Language
package	O
,	O
create	O
a	O
'	O
libname.amd.json	O
'	O
file	O
in	O
the	O
project	O
root	O
.	O
</s>
