Test Plan: grep for global BigInt and make sure there's no longer
instances in code files now that we added it to central ESLint Config
Paired with @decentralion
"This rule is aimed at flagging variables that are declared using let
keyword, but never reassigned after the initial assignment."
https://eslint.org/docs/rules/prefer-const
This is a rule that helps you spot mistakes while writing code with a
let statement. When thinking that you will need to reassign it, eslint
will point out you're not actually doing so.
This could be because you've forgotten something, assigned the wrong
variable, or no longer need to reassign.
Summary:
We’ve had this policy unspoken since the beginning; making it explicit
as a lint rule makes it one less thing to think about. The few existing
offenders can almost all be changed with no value lost; one is an extern
that needs a lint suppression.
Test Plan:
That Flow and tests still pass suffices.
wchargin-branch: lint-camelcase
The eslint no-constant-condition rule disallows while(true) loops,
since the true is a constant condition. However, I find the allowed
alternative (`for (;;)`) less readable, so I am adding the sub-rule that
allows constant conditions for loops.
Test plan: A followon commit uses a while(true) loop, and, assuming this
patch is applied, it does not result in a lint error.
Co-authored-by: Robin van Boven <497556+Beanow@users.noreply.github.com>
This commit updates eslint from v4 to v6. In doing so, I've moved off of
the create-react-app base eslint config. We were on an old version (v2)
and it doesn't make sense to update to v4, as in v4 create-react-app
uses typescript. Also, it didn't make sense to stay on
create-react-app's v2 config, because then it had unmet peer dependency
constraints on old versions of eslint.
Instead, I've moved us to use the default rules for eslint,
eslint-plugin-react, and eslint-plugin-flowtype.
I also made some changes to the codebase to satisfy the new lint rules
that came with this change.
Test plan: `yarn test` passes.
I wanted to add two new flowtype lint rules. However, as seen in #853
and #854, these rules don't work very well. As such, I'm giving up on
those two and removing the TODOs.
Test plan: n/a
This commit upgrades the flow-type eslint plugin to latest, and writes
new rules into the eslintrc. To keep the diff clean, the rules are
disabled: I will turn them on individually (fixing errors) in followon
commits.
Test plan: `yarn test`.
Uncommenting the lines produces many lint errors (but the linter still operates as expected).
Summary:
In fact, a constructor that only calls `super` is useful: it specifies
the API for constructing an object of a given class without needing to
traverse its prototype chain. (That constructors are inherited at all is
arguably a design flaw.)
Test Plan:
None.
wchargin-branch: yes-useful-constructor
Summary:
Even though it’s not really a source file, and it lives at the
repository root, it might as well have typing to make sure that we don’t
do anything really dumb.
Test Plan:
`yarn flow` still passes.
wchargin-branch: flow-eslintrc
Test Plan:
Run `yarn lint` and `yarn travis` and observe success. Add something
that triggers a lint warning, like `const zzz = 3;`; re-run and observe
failures.
wchargin-branch: lint
Hammad Jutt
Robin van Boven
Dandelion Mané
William Chargin