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use global.setInterval

does not help - now the global var itself gets accused by the linter ;)

However, Espruino doesn't pay any attention to use strict

imho that's ok - to get some hints in the editor is already great!

code using the 'use strict' directive is identified by the editor, but
brings up error message for built-in library functions (see attached image)

function test_strict(){
  "use strict";
  
  var N=false;   // oops - typo...
  setInterval( function(){
    LED2.write( n);
    n = !n;
  },1000);
}

is there any libraray available to satisfy the editor's strict validator?

ps: the esprima minifyer ignores the strict directive, and reports even bad code to be fine

it's literally data.length+"\r\n"+data+"\r\n"?

be aware of base 16 encoding of data.length - e.g. data.length.toString(16)

ps: respect - i am absolutely surprised about your speedy response - i'll check out your update 'till tomorrow morning (CET ;)

epsruino board 1v4, fw 1v80, cc3000, http client

i expted the code below to send 3 chunks (snippet#1):

function post_test1(){       
var o = {
host: BACKEND_IP,
port: BACKEND_PORT,
path: BACKEND_ROOT, 
method:'POST',
headers: {
  "Content-Type" : "application/json",
  "Transfer-Encoding": 'chunked'
}
};
var req= http.request( o, function(res)  {    
res.on('close', function() { 
  console.log( 'post closed',res.statusCode);  
});       
res.on('end', function() { 
  console.log( 'post end',res.statusCode);  
});       
});

setTimeout( function(){
  var c = 'abcd';
  console.log('sending',c);
  req.write( c);         
}, 1000);

setTimeout( function(){
  var c = 'zyxw';  
  console.log('sending',c);
  req.write( c);         
}, 3000);

setTimeout( function(){
  c='the end';
  console.log('sending',c);
  req.end( c);         
}, 5000);
}

but there is nothing (not even a header) received by the server. i detected two major issues.

A) the req object does mostly not work in the setTimeout callback - reqseems to be valid until next idle state only (or a few milliseconds longer 'cause the bad code below worked in very seldom trials)

// this is fine - snippet#2a
  req.write( 'abcd');         
  req.end( 'the end');         

// this is - mostly - bad - snippet#2b
req.write( 'abcd');         
setTimeout( function(){
  req.end( 'the end');         
}, 1000);

B) req.write(...) does not produce a chunked payload / does not encode chunks;

// this should send two chunks: - snippet#3a
  req.write( 'abcd');         
  req.end( 'the end');         

at least it sends the data, but does no chunk encoding

// the chunk encoding has to be added manually:- snippet#3b
  req.write( '4\r\nabcd\r\n');         
  req.end( '7\r\nthe end\r\n0\r\n\r\n');

the code snippet#1 runs from node.js 0.12.4 as expected. seems that the espruino http client does some things different from node.js' http client (which applies chunked encoding by default - as long as you to not set the content-length header).

is any workaround / solution possible?

thx!