Determine (un)supported ES6 features

[brettlangdon]

To try and help determine if #122 can be closed or not. It would be nice to add examples of some major ES6 features into the examples directory to help ensure that jsfmt can handle everything just fine.

There is probably a better place to grab examples from, but I was just going to grab most of the examples from http://es6-features.org/ and toss them into examples/es6.

Open to thoughts/suggestions from those who are using ES6 much more than I am.

[brettlangdon]

Seeing a few issues already for unsupported ES6 features:

• Destructuring - Array Matching
  • http://es6-features.org/#ArrayMatching
  • var [ a, , b ] = list;
  • The empty match in the array causes: examples/es6/destructuring.js [TypeError: Cannot read property 'endToken' of null]
• let
  • Most of the examples from http://es6-features.org/ do not have semi-colons after let statements, jsfmt doesn't like that very much
• For-of
  • http://es6-features.org/#IteratorForOfOperator
  • for (let n of fibonacci) {
  • jsfmt likes to move let down to the next line
  • jsfmt also likes to always put a newline before of, so the more times you run jsfmt the more newlines you will have

I'm sure I'll find more as I go along.

[christopherobin]

One I found this morning: assigning a class definition breaks the indentation.

Input:

exports.Test = class Test { foo() { console.log('bar'); } };

Expected Output:

exports.Test = class Test {
  foo() {
    console.log('bar');
  }
};

Current Output:

exports.Test = class Test {
foo() {
  console.log('bar');
}};

[email protected], [email protected]

[brettlangdon]

Hey @christopherobin thank you for reporting this.

[sowdri]

var [ variable1, variable2, ..., variableN ] = array;
var [,,third] = ["foo", "bar", "baz"];

Formatting fails for any of the above lines as well.

[ariya]

@sowdri Your first example is a bit strange: what syntax feature would you expect to get there?