EcmaScript 6 - Tern IDE for Eclipse validation errors

Question

I am using Eclipse Mars with the Tern IDE für ES6 support on version 1.1.0 (the snapshot). I get validation errors on arrow functions and const-exports as can be seen in this screenshot:

I worked through these descriptions but the errors won't vanish: https://github.com/angelozerr/tern.java/wiki/Tern-&-ECMAScript6-support https://github.com/angelozerr/tern.java/wiki/Tern-Linter

I don't know however whats really supported by the Tern plugin, but according to the documentation on http://ternjs.net/ Tern should support arrow functions since 0.14. The IDE-page on github however only mentions class, import and promise support (which is beyond basic in my eyes for a plugin to support ES6).

Is there anyone who is developing ES6 with Eclipse with (more or less) full feature support? I kinda feel like a unicorn...

> only mentions class, import and promise support (which is beyond basic in my eyes for a plugin to support ES6). @Ahab ternjs supports more ES6 features like ES modules, etc. See https://github.com/ternjs/tern/issues/116#issuecomment-131781238 I had no time to update the wiki with thoses features, any help are welcome to update the wiki. — Angelo, Nov 02 '15 at 14:50

Angelo · Accepted Answer · 2015-11-03T14:41:10.353

9

Your error comes from JSDT Validator which doesn't support ES6 syntax (and not from tern).

tern 1.1.0-SNAPSHOT provides support for ES6 for completion, hyperlink, validation but not for ES6 validation. The linter https://github.com/angelozerr/tern.java/wiki/Tern-Linter is a type checker validator and not a syntax validator.

To validate ES6 with Eclipse IDE & tern.java, you must:

disable JSDT Validator. For that you can remove the JSDT nature from your .project. Or install (never tested) the not released Eclipse JEE distribution which provides an option to turn off internal parsing and validation. See http://tools.jboss.org/documentation/whatsnew/jbosstools/4.3.0.Final.html#javascript-development-tools-improvements
after that, you can use JSHint to validate ES6, with https://github.com/angelozerr/tern.java/wiki/Tern-Linter-JSHint. To enable JSHint to validate ES6 correctly it needs to get the "esnext"-option enabled otherwise ES6 syntax will be marked as errors. The option is found in the project properties\Tern\Validation\JSHint under "Relaxing options".

edited Nov 03 '15 at 14:41

answered Nov 02 '15 at 14:41

Angelo

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Thanks a lot so far! I in deed did the approach with switching to an "External Builder/Validator" but the nature still kept the errors somehow, removing the nature ultimately switched off the validation. – Ahab Nov 03 '15 at 10:59
@Ahab could you add a comment at https://bugs.eclipse.org/bugs/show_bug.cgi?id=472754 with your problem with "External Builder/Validator" Thanks! – Angelo Nov 03 '15 at 14:58
I added a comment on your linked bug report. Maybe you could implement some kind of validation include/exclude functionality? Validation on JSHint takes forever although I excluded my node_modules from build path of JSDT initially. – Ahab Nov 10 '15 at 12:20
For Validation on JSHint, please create issues at https://github.com/angelozerr/tern.java/issues and please share your project which caues problem. – Angelo Nov 11 '15 at 14:02

EcmaScript 6 - Tern IDE for Eclipse validation errors

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