A Rust crate for writing fast JavaScript and TypeScript linters.
This crate powers deno lint
, but is not Deno specific
and can be used to write linters for Node as well.
Supports recommended
set of rules from ESLint and @typescript-eslint
out of the box
with no config.
See the roadmap
Visit https://lint.deno.land for the list of available rules.
Blazing fast, see comparison with ESLint:
[
{
"name": "deno_lint",
"totalMs": 105.3750100000002,
"runsCount": 5,
"measuredRunsAvgMs": 21.07500200000004,
"measuredRunsMs": [
24.79783199999997,
19.563640000000078,
20.759051999999883,
19.99068000000011,
20.26380600000016
]
},
{
"name": "eslint",
"totalMs": 11845.073306000002,
"runsCount": 5,
"measuredRunsAvgMs": 2369.0146612000003,
"measuredRunsMs": [
2686.1039550000005,
2281.501061,
2298.6185210000003,
2279.5962849999996,
2299.2534840000008
]
}
]
Benchmarks are run during CI on Ubuntu, using the same set of rules for both linters.
Test subject is oak
server consisting of about 50 files.
See ./benchmarks/
directory for more info.
examples/dlint/main.rs
provides a minimal standalone binary demonstrating
how deno_lint
can be used as a crate.
# Build standalone binary
$ cargo build --example dlint
$ ./target/debug/examples/dlint --help
dlint
USAGE:
dlint <SUBCOMMAND>
FLAGS:
-h, --help Prints help information
-V, --version Prints version information
SUBCOMMANDS:
help Prints this message or the help of the given subcommand(s)
rules
run
$ ./target/debug/examples/dlint run ../deno/std/http/server.ts ../deno/std/http/file_server.ts
(no-empty) Empty block statement
--> ../deno/std/http/server.ts:93:14
|
93 | } catch {}
| ^^
|
(no-empty) Empty block statement
--> ../deno/std/http/server.ts:111:44
|
111 | while ((await body.read(buf)) !== null) {}
| ^^
|
(no-empty) Empty block statement
--> ../deno/std/http/server.ts:120:41
|
120 | constructor(public listener: Listener) {}
| ^^
|
(ban-untagged-todo) TODO should be tagged with (@username) or (#issue)
--> ../deno/std/http/file_server.ts:5:0
|
5 | // TODO Stream responses instead of reading them into memory.
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
(ban-untagged-todo) TODO should be tagged with (@username) or (#issue)
--> ../deno/std/http/file_server.ts:6:0
|
6 | // TODO Add tests like these:
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
(ban-untagged-todo) TODO should be tagged with (@username) or (#issue)
--> ../deno/std/http/file_server.ts:137:0
|
137 | // TODO: simplify this after deno.stat and deno.readDir are fixed
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
(no-empty) Empty block statement
--> ../deno/std/http/file_server.ts:155:16
|
155 | } catch (e) {}
| ^^
|
Found 7 problems
For more concrete implementation visit deno
Make sure to have latest stable version of Rust installed (1.52.0).
// check version
$ rustc --version
rustc 1.52.0 (88f19c6da 2021-05-03)
// build all targets
$ cargo build --all-targets
// test it
$ cargo test
Prerequisites:
- Install
perf
,stackcollapse-perf
,rust-unmangle
andflamegraph
$ RUSTFLAGS='-g' cargo build --release --all-targets # build target
$ sudo perf record --call-graph dwarf ./target/release/examples/dlint benchmarks/oak/**.ts # create performance profile
$ perf script | stackcollapse-perf | rust-unmangle | flamegraph > flame.svg # generate flamegraph
These commands can take a few minutes to run.
-
If you are going to work on an issue, mention so in the issue comments before you start working on the issue.
-
Please be professional in the forums. We follow Rust's code of conduct (CoC) Have a problem? Email ry@tinyclouds.org.
-
Ask for help in the community chat room.
Before submitting, please make sure the following is done:
- That there is a related issue and it is referenced in the PR text.
- There are tests that cover the changes.
- Ensure
cargo test
passes. - Format your code with
deno run --allow-run tools/format.ts
- Make sure
deno run --allow-run tools/lint.ts
passes.