parser: Change suffix to use ES6 default module export

[Turbo87]

This export will be transpiled by Babel for the cjs distribution, but will enable others to use a pure ES6 module distribution.

Resolves #1313

/cc @chadhietala @mmun

[chadhietala]

This seems good. I wouldn't think the CI failures are related.

[Turbo87]

yeah, that test failure seems to be unrelated

[nknapp]

It's not completely unrelated. The reason is this:

ERROR: Coverage for statements (95.06%) does not meet global threshold (100%)
ERROR: Coverage for branches (95.77%) does not meet global threshold (100%)
ERROR: Coverage for functions (97.01%) does not meet global threshold (100%)

The generated file dist/cjs/handlebars/compiler/parser.js is not completely covered by tests.
There is a line /* istanbul ignore next */ in the header but somehow it has no effect, when this PR is applied.

[nknapp]

Coverage-Report of the parser.js file...

parser-coverage.zip

[nknapp]

Since all the lines in this file have been ignored in the recent builds and I don't think it is possible to cover the entire file, I think it would be OK to exclude the file in .istanbul.yml.

@chadhietala could you do that?

[Turbo87]

@nknapp good point. I've added the parser.js file to the istanbul ignore list

[nknapp]

I have squashed the commits (makes it easier to cherry-pick to the 4.x-branch) and removed the now obsolete istanbul annotation from parser-prefix.

I hope you didn't mind me force-pushing to your es6-parser branch.

[Turbo87]

Not at all, thanks!