Unexpected token ILLEGAL

My code:

var foo = `bar`;

If I paste it on the left side of the IDE (Web IDE version 0.70.6) it works fine, if I try to upload it from the edit panel it gives the error message "Error: Line 1: Unexpected token ILLEGAL".

I'm using more complex strings also containing both single and double quotes, e.g.

var foo = `console.log('This is "cool".');`; 
var bar =`Line1
Line2`;
//storage.write, storage.read
eval(foo); 
console.log(bar);

A workaround would be var foo = 'console.log("This is \\\"cool\\\".");'; and
bar="Line1\nLine2", but that's hard to write. What's the cause of this error?

Strange, works for me with 71.3.
Do you have minification turned on? Esprima (offline) doesn't like the ` character: "TypeError: Cannot read property 'length' of undefined". Online (closure compiler) minification works.
Try upgrading to the latest web ide :)

Sun 2019.08.04

Strings are delimited with the double quote "

Json name/value values and Html attributes delimited with the single quote '

That character is the grave accent. ` Template Literal

New Web IDE - testers

Proper usage as you require explained in detail by @allObjects

http://forum.espruino.com/conversations/309985/

Single quotes go inside a double quoted string, (unless escaped as you show) not double embedded in a single quoted string.

https://www.javascript.com/learn/strings
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals

Do you have minification turned on? Esprima (offline) doesn't like the ` character

Hit. Without Esprima it works fine. Thanks!

Any chance of using a newer IDE version? If you installed the Chrome web app it should have updated to 0.71.3 weeks ago - I updated to a newer Esprima version some time ago which handles that fine.

I guess you're on the native download? I've just updated that to the latest version now - but if you can use it the chrome app is preferable since it auto-updates.

I'm fine with the bug, I don't need any minfication in this case (it won't modify the contents of that string anyway).

In 0.71.4 it says for foo=`bar`;
using Esprima "TypeError: Cannot read property 'length' of undefined", or
using Closure [Advanced] :"No errors. Minifying 10 bytes to 11 bytes".

TypeError: Cannot read property 'length' of undefined

I know, that's a bit odd, but it still seems to work?

Yes, it seems to work. But I tested only simple, single strings.