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 thi

Answer 1

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".