awful_waffle
Enabling --warnings-as-errors flag?
Hello!
I recently discovered the --warnings-as-errors flag and strongly prefer the workflow of being blocked by compiler warnings. Warnings in Elixir seem to be much more important (i.e. calls to undefined functions) than what I typically see as warnings in my experience with other languages (i.e. lint errors, unused variables).
I’m currently working through a Phoenix project but found that mix phx.server --warnings-as-errors was unrecognized. Is there a way to tell mix/Elixir to use --warnings-as-errors under the hood when running phx.server?
Thank you for your help!
Marked As Solved
hauleth
If you want to enable that flag by default you can use:
elixirc_options: [
:warnings_as_errors
]
Also Liked
fuelen
Hello!
--warnings-as-errors is a flag for mix compile.
What do you expect from --warnings-as-errors when running phx.server? Do not start server at all?
If so, then this command may help:
$ mix do compile --warnings-as-errors, phx.server
awful_waffle
Thanks for the responses!
Adding elixirc_options: [warnings_as_errors: true] to my project in mix.exs achieved my goal! Now warnings display as errors when I am working in Phoenix, which works great with live reload. If I start the server with an error, it fails to run - which is fine with me.
The only down side is that the warning itself is not printed to the browser - it just shows a generic compilation error screen. The console in which I ran mix phx.server still displays the rest of the information, at least. I assume there is a configuration setting somewhere to output those warnings to the web display, but for now I am happy.
Thank you again!
Last Post!
awful_waffle
Thanks for the responses!
Adding elixirc_options: [warnings_as_errors: true] to my project in mix.exs achieved my goal! Now warnings display as errors when I am working in Phoenix, which works great with live reload. If I start the server with an error, it fails to run - which is fine with me.
The only down side is that the warning itself is not printed to the browser - it just shows a generic compilation error screen. The console in which I ran mix phx.server still displays the rest of the information, at least. I assume there is a configuration setting somewhere to output those warnings to the web display, but for now I am happy.
Thank you again!
Popular in Questions
Other popular topics
Latest Phoenix Threads
Latest on Elixir Forum
Sponsor Spotlight
Courses that'll move you from confusion to "Aha, now I get it!"
Categories:
Sub Categories:
Forums
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #deployment
- #library
- #erlang
- #testing
- #genserver
- #mix
- #absinthe
- #remote-other
- #otp
- #plug
- #how-to-question
- #macros
- #postgres
- #channels
- #elixirconf
- #exunit
- #discussion
- #code-sync
- #javascript
- #podcasts
- #onsite
- #dialyzer
- #docker
- #authentication
- #umbrella
- #full-time-contract
- #podcasts-by-brainlid
- #ecto-query
- #elixir-ls
- #phoenix_html
- #iex
- #blog-post
- #graphql
- #genstage
- #ai
- #websockets
- #supervisor
- #elixirconf-us
- #advent-of-code
- #distillery
- #processes
- #api
- #forms
- #metaprogramming
- #security
- #hex
Our Sponsors
Build Elixir applications with speed and confidence.
Supporting innovation across the BEAM ecosystem.
We build reliable cloud platforms for business-critical systems.
Catch errors, track performance, monitor hosts and more.
Error tracking for Elixir devs who love to ship. Start your free account.
Practical resources that improve the lives of professional developers.
Develop your skills with books, videos, and courses.
Enabling companies to succeed by building software people love.
The team behind Membrane, Popcorn, LiveDebugger. Available for hire.
Courses that'll move you from confusion to "Aha, now I get it!"