STRF-9112 Improve langJson javascript helper

[jairo-bc]

I believe Object.entries are being slow on GraalVM, so refactored it using simple for

cc @bigcommerce/storefront-team

[junedkazi]

do we have existing tests to support the change ?

[jairo-bc]

yes, we do

paper/spec/lib/translator.js

Line 215 in af6e235

it('should return a cascaded translation object', done => {

paper/spec/lib/translator.js

Line 239 in af6e235

it('should return a translation object filtered by key', done => {

[junedkazi]

Can you also attach some metrics to show the before and after improvements

[jairo-bc]

@junedkazi I've added a screenshot of the current measurement on the second call.

Previously, I have those values:

[junedkazi]

You should also look at https://github.com/bigcommerce/paper/pull/218/files @mattolson had some performance improvements specially in the same file you are working on. I wonder if we should get Matt's changes rebased and merged first ? cc @jmwiese

[jairo-bc]

@junedkazi We can test them in the graalvm, but those changes are mostly in languages transformation, that part was moved to storefront service.
I've also looked at https://github.com/bigcommerce/paper-handlebars/pull/113/files, eval is not the most costly operation here. Calling handlebars.template is https://github.com/bigcommerce/paper-handlebars/pull/113/files#diff-e727e4bdf3657fd1d798edcd6b099d6e092f8573cba266154583a746bba0f346R213

[jairo-bc]

@junedkazi Could you please merge it, since I don't have rights for that?