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Re: [wtp-dev] JSDT meeting agenda 20151103 


On 4 Nov 2015, at 11:19, Angelo zerr wrote:
I have noticed the freeze as well but it is not due to typescript compiler 
but more of an issue on how it is used with eclipse.
Yes I agree with you. tern.java support async completion for instance to 
avoid freez Eclipse when ternjs takes time.



The attractive points on typescript compiler was it actually provides
a bunch of services for IDEs that could allow us to replace the
corresponding outdated JSDT ones. Also the number of type definition
libraries is very extensive for typescript.



For your information, ternjs provides a (basic) tools to tranform
typescript definition to tern definition. See
https://github.com/ternjs/tern/blob/master/bin/from_ts
The https://github.com/cloud9ide/tern_from_ts project host several
generated tern JSON Type Definition generated from TypeScript definition. 

tern.java could provide an action to generate JSON Type Definition (by
calling from_ts) from TypeScript definition.
Anyhow, this was a quick experimentation on my part and I am not convinced 
it is the way forward
To be honnest with you, I don't understand what you mean with "Can be used as an alternate to tern.js". TypeScript needs to declare variable with 
type
(ex: var p: Person) although JavaScript needs not that and ternjs is able 
to guess the type.
Agreed. typescript compiler does not seem to provide inference in this 
case. It relies on
modules and module definitions.



Yes that it is.




In my side, I have started to study how we could support

Angular2 which is based on TypeScript
https://github.com/angelozerr/angularjs-eclipse/issues/164 and I have 
several ideas to support TypeScript with tern.java:
* TypeScript provides a tsserver which uses TypeScript Language Service. It works with "readline" and not with "http" (tern.java works only with 
"http").


What is the advantage of http over readLine?

My first idea is to use TypeScript Language Service inside
tern.java by customizing JSON request/response of tsserver to adapt it for ternjs. See project https://github.com/angelozerr/tern-tsserver What is 
the
benefit with existing Eclipse TypeScript plugins: the async completion of 
tern.java

https://github.com/angelozerr/tern.java/wiki/New-and-Noteworthy-0.9.0#async-tern-completion
which avoid freezing Eclipse.
* my second idea (my prefered idea, but which is hard) is to implement an acorn plugin for TypeScript like https://github.com/RReverser/acorn-jsx 
have done for JSX. I have started at
https://github.com/angelozerr/tern-typescript/blob/master/acorn-ts.js . Today I can support declaration type like (var a: Person). The benefit 
with
that is that we will able to use tern plugins features to customize
completion for Angular2.



This is probably the case that I would like JSDT to support better. I
hope we can replace the JSDT parser with a pluggable one like acorn. I know that there is an interest to extend JSDT to things like QML as well so 
a pluggable parser will help.
Thanks for you rfeedback, So I will try to continue tern-typescript with 
acorn-ts (extension of acorn to support TypeScript).
Another advantage of this approach will be the AST can be shared among 
tools avoiding
extra parsing. ESTree seems to be the de-factor standard for JavaScript 
AST, it would
be grand if we can support ESTree natively on JSDT so that it is shared 
among libraries/tools and
avoiding repeated parsing.
Yes Acorn and espree follows this specification. I think TypeScript should 
does that too.


ESTree natively on JSDT


You mean developping a JavaScript Parser which supports ESTree?
There are already two good parsers (acorn, esprima) for ESTree. I would like to change the current Parser with one based on those and make the resulting AST retrievable through an API. For instance libraries such as ESlint can actually operate on ESTree based AST so that it can skip the parser. This is the approach that Orion is also taking. 

Does tern.js allow us to fetch ESTree based AST to optimize?





Regard's Angelo

2015-11-03 21:19 GMT+01:00 Gorkem Ercan <gorkem.ercan@xxxxxxxxx>:



Updated the agenda with minutes.


On 3 Nov 2015, at 10:30, Gorkem Ercan wrote:
Meeting agenda for today's JSDT call is up. As usual, please feel free to 


add items.

https://wiki.eclipse.org/JSDT/Confcalls/Minutes_20151103#Meeting_Agenda

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