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These are the steps I took to change a modest project from CoffeeScript to ES6.

My ~2000LoC project took me around 6 hours to port, but I sunk 3 hours into a stupid mistake, and 2 into figuring out these steps, so with these steps & warnings at your disposal already, you should be able to do bigger projects in considerably less time.

Automatic tools only take you so far, there will be some manual fixing. Sometimes the generated code clearly doesn't look like a human wrote it, and sometimes there are bugs.

In this last case, when porting software trips over a particular bit of CoffeeScript, comment this bit out, and try transpiling the file again. If this is successfull, you'll see the commented CoffeeScript inside the JS, and you can port that bit yourself.

Okay let's dive right in!

My largest Sidekiq application had a memory leak and I was able to find and fix it in just few hours spent on analyzing Ruby's heap. In this post I'll show my profiling setup.

As you might know Ruby 2.1 introduced a few great changes to ObjectSpace, so now it's much easier to find a line of code that is allocating too many objects. Here is great post explaining how it's working.

I was too lazy to set up some seeding and run it locally, so I checked that test suite passes when profiling is enabled and pushed debugging to production. Production environment also suited me better since my jobs data can't be fully random generated.

So, in order to profile your worker, add the sidekiq_profiler.rb (below) to your project

Adjust number of jobs you want your worker to process before you have heap dumped.
Run a sample worker: PROFILE=1 sidekiq -C config/sidekiq.yml and wait for jobs to be processed.

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

Common Options

-#, --progress-bar Make curl display a simple progress bar instead of the more informational standard meter.

-b, --cookie <name=data> Supply cookie with request. If no =, then specifies the cookie file to use (see -c).

-c, --cookie-jar <file name> File to save response cookies to.

	require "active_record"

	ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
	ActiveRecord::Migration.class_eval do
	create_table(:records) do \|t\|
	t.string :column
	end
	end

	data = 50_000.times.map { \|i\| Hash[column: "Column #{i}"] }

	CREATE EXTENSION IF NOT EXISTS "unaccent"

	CREATE OR REPLACE FUNCTION slugify("value" TEXT)
	RETURNS TEXT AS $$
	-- removes accents (diacritic signs) from a given string --
	WITH "unaccented" AS (
	SELECT unaccent("value") AS "value"
	),
	-- lowercases the string
	"lowercase" AS (