This is purely a mechanical change, not taking advantage of block scope
of "let" and "const". Minimizing variable scope will come in the next
commit.
In general, "var" is converted into "let" and "const" is used only for
immutable variables of permanent character (generally spelled in
ALL_CAPS). Using it for any immutable variable regardless on its
permanence would feel confusing.
Any code which is not transpiled and needs to run in ES6 environment
(examples, code in grammars embedded in specs, ...) is kept unchanged.
This is also true for code generated by PEG.js.
See #442.
This will allow to use ES2015 constructs in benchmark code.
The change required introducing a small server, which serves both PEG.js
and benchmark code passed through Babel and bundled together. This
allowed to convert the benchmark to regular modules and to get rid of
the hackery that was previously needed to make it run both in Node.js
and in the browser.
Note the benchmark no longer exercises the browser version.
See #442.
David Majda