Problem: failed equality checks as in "(is (= expected actual))" will give a
single, long line of output that for anything but the simplest data structures
is unreadable by humans, and the output doesn't give a useful diff.
Solution: use library https://github.com/nubank/matcher-combinators and its test
directive "match?" which will pinpoint where two data structures differ. Then,
instead of "(is (= ...", use "(is (match? expected actual)". It works
beautifully.
The library offers other nice matchers, but the majority of the time match? is
sufficient.
Can we use another test runner like Kaocha? kaocha-cljs2
(https://github.com/lambdaisland/kaocha-cljs2) would be able to print better
test errors out of the box, among other features, but I have no clue if it would
work well or at all in our stack (in theory yes, but it's a larger piece of
work).
This commit is the foundational step to start using malli
(https://github.com/metosin/malli) in this project.
Take in consideration we will only be able to realize malli's full power in
future iterations.
For those without context: the mobile team watched a presentation about malli
and went through a light RFC to put everyone on the same page, among other
discussions here and there in PRs.
To keep things relatively short:
1. Unit, integration and component tests will short-circuit (fail) when
inputs/outputs don't conform to their respective function schemas (CI should
fail too).
2. Failed schema checks will not block the app from initializing, nor throw an
exception that would trigger the LogBox. Exceptions are only thrown in the
scope of automated tests.
3. There's zero performance impact in production code because we only
instrument. Instrumentation is removed from the compiled code due to the
usage of "^boolean js.goog/DEBUG".
4. We shouldn't expect any meaningful slowdown during development.
**What are we instrumenting in this PR?**
Per our team's agreement, we're only instrumenting the bare minimum to showcase 2 examples.
- Instrument a utility function utils.money/format-amount using the macro
approach.
- Instrument a quo component quo.components.counter.step.view/view using the
functional approach.
Both approaches are useful, the functional approach is powerful and allow us to
instrument anonymous functions, like the ones we pass to subscriptions or event
handlers, or the higher-order function quo.theme/with-theme. The macro approach
is perfect for functions already defined with defn.
**I evaluated the schema or function in the REPL but nothing changes**
- If you evaluate the source function, you need to evaluate schema/=> or
schema/instrument as well.
- Remember to *var quote* when using schema/instrument.
- You must call "(status-im2.setup.schema/setup!)" after any var is
re-instrumented. It's advisable to add a keybinding in your editor to send
this expression automatically to the CLJS REPL, or add the call at the end of
the namespace you are working on (similar to how some devs add "(run-tests)"
at the end of test namespaces).
**Where should schemas be defined?**
For the moment, we should focus on instrumenting quo components, so define each
function schema in the same namespace as the component's public "view" var.
To be specific:
- A schema used only to instrument a single function and not used elsewhere,
like a quo component schema, wouldn't benefit from being defined in a separate
namespace because that would force the developer to constantly open two files
instead of one to check function signatures.
- A common schema reused across the repo, like ":schema.common/theme" should be
registered in the global registry "schema.registry" so that consumers can just
refer to it by keyword, as if it was a built-in malli schema.
- A common schema describing status-go entities like message, notification,
community, etc can be stored either in the respective
"src/status_im2/contexts/*" or registered globally, or even somewhere else.
This is yet to be defined, but since I chose not to include schemas for them,
we can postpone this guideline.
This commit adds a custom linter to verify i18n/label is called with a qualified
keyword, like :t/foo. More sophisticated linters are possible too.
We also set the stage for other developers to consider more lint automation
instead of manually reviewing conventions in PRs.
If you want to understand how to write custom linters, check out
https://github.com/clj-kondo/clj-kondo/blob/master/doc/hooks.md. You can fire
the Clojure JVM REPL in status-mobile and play with the clj-kondo hook too, it
works beautifully.
Why do we care? By making sure all translation keywords are qualified with "t",
it is trivial to grep or replace them because they're unique in the repo, and
can't be confused with other words if you search by ":t/<something>".
Note: It's a best practice to commit clj-kondo configuration from external
libraries in the .clj-kondo directory. The directory .clj-kondo/babashka is
auto-generated, that's why it was added.
Recently, we changed clj-kondo default fail-level from "warning" to "error", but
we missed the fact that we needed to raise the default level for all linters set
to "warning".
Unshadows all remaining vars in status-mobile, including non
cljs.core/clojure.core ones. The only exceptions are cljs.core/type and
cljs.core/name (which happen quite often, so I'm not sure if it's worth
unshadowing them).
This is a continuation of https://github.com/status-im/status-mobile/pull/16500 (Lint
& fix some shadowed core Clojure(Script) vars).
Notes: As a reminder, the goal is to eventually disallow shadowing core Clojure
vars entirely, but to get there and avoid rebase hell and regressions, we need
to do in smaller steps, especially because we can't safely automate the process
of unshadowing vars.
We are already down from ~500 shadowed core vars to 350 in total.
Why is this PR is using names such as "s", "v" or "sym"? Names such as s or v
are the so called idiomatic names, and are listed in the Clojure Style Guide
https://guide.clojure.style/#idiomatic-names. I used them whenever I felt
appropriate. For the var cljs.core/symbol I opted to use sym, even though the
symbol in question is not necessarily a Clojure symbol, I think the alias
conveys the meaning well enough
(https://www.clojure.org/guides/learn/syntax#_symbols_and_idents).
New vars linted:
- comparator
- identity
- str
- symbol
- val
Outstanding shadowed vars include type, name, hash, comp.
It's well known that shadowing core Clojure vars can lead to unexpected bugs. In
fact, it's a common source of bugs in other languages too. In the status-mobile
repository there are, in total, 562 shadowed vars, ~500 are core vars. Excluding
the "old code" we still have 285 offenders.
In status-mobile I've already seen two bugs caused by shadowed vars, both with
the shadowed var "name". But probably other problems happened in the past, and
others will happen in the future if we don't do something about this. This PR is
also my response to my frustration trying to review PRs and checking for
shadowed vars, humans were not meant for that!
In this commit we are enabling ":shadowed-var" to lint certain (not all) core
vars as errors (not warnings). In future PRs we can gradually unshadow more
vars. For the record, name is shadowed 40 times in the new code and 130 in
total, and type is shadowed 93 times in the new code and 124 in total!
What about non-core vars, should we allow shadowing? There are ~70 non-core
shadowed vars. In my opinion, we should also lint and disallow shadowing
non-core vars, since it may cause the same kind of bugs of shadowing core vars.
But this decision can be left for another moment/issue, after we have fixed the
most prominent problem of shadowing core vars.
Which vars are unshadowed in this PR? I fixed 62 errors and unshadowed
cljs.core/iter, cljs.core/time, cljs.core/count, cljs.core/key,
clojure.core/key.
Resources:
- [clj-kondo linter: shadowed-var](https://github.com/clj-kondo/clj-kondo/blob/master/doc/linters.md#shadowed-var)
EXPERIMENTAL: uses reanimated lib so we can use reanimated buttons inside and have simultaneous handlers
Add react hooks
Use hooks
mocks
Use timing for drag transition
Use view on android
Signed-off-by: Gheorghe Pinzaru <feross95@gmail.com>
flexsurfer
Icaro Motta
yqrashawn
Parvesh Monu
Gheorghe Pinzaru
yenda
Roman Volosovskyi