deno_lint

NOTE Very much work-in-progress

Rust crate for writing JavaScript and TypeScript linters.

Blazingly fast, see comparison with ESLint:

[ { "name":"deno_lint", "totalMs":12.234113999999863, "runsCount":5, "runsAvgMs":2.4468227999999725, "runsMs":[ 3.500347000000147, 2.2351940000000923, 2.2010919999997896, 2.1718909999999596, 2.1255899999998746 ] }, { "name":"eslint", "totalMs":11414.694615999999, "runsCount":5, "runsAvgMs":2282.9389232, "runsMs":[ 2489.383729, 2225.3896830000003, 2226.8073840000006, 2252.641211, 2220.4726089999986 ] } ]

Benchmarks are run during CI on Ubuntu. Using the same set of rules for both linters. See ./benchmarks/ directory for more info.

Supported rules

• ban-ts-comment
• ban-ts-ignore
• ban-untagged-ignore
• ban-untagged-todo
• constructor-super
• default-param-last
• eqeqeq
• explicit-function-return-type
• for-direction
• getter-return
• no-array-constructor
• no-async-promise-executor
• no-case-declarations
• no-class-assign
• no-compare-neg-zero
• no-cond-assign
• no-debugger
• no-delete-var
• no-dupe-args
• no-dupe-keys
• no-duplicate-case
• no-empty-character-class
• no-empty-function
• no-empty-interface
• no-empty-pattern
• no-empty
• no-eval
• no-ex-assign
• no-explicit-any
• no-func-assign
• no-misused-new
• no-namespace
• no-new-symbol
• no-obj-call
• no-octal
• no-prototype-builtins
• no-regex-spaces
• no-setter-return
• no-sparse-array
• no-this-alias
• no-throw-literal
• no-unsafe-finally
• no-unsafe-negation
• no-var
• no-with
• prefer-namespace-keyword
• require-yield
• single-var-declarator
• triple-slash-reference
• use-isnan
• valid-typeof

Ignore directives

Files

To ignore whole file // deno-lint-ignore-file directive should placed at the top of the file.

```ts // deno-lint-ignore-file

function foo(): any { // ... } ```

Ignore directive must be placed before first stament or declaration:

```ts // Copyright 2020 the Deno authors. All rights reserved. MIT license.

/* * Some JS doc */

// deno-lint-ignore-file

import { bar } from "./bar.js";

function foo(): any { // ... } ```

Diagnostics

To ignore certain diagnostic // deno-lint-ignore <codes...> directive should be placed before offending line.

```ts // deno-lint-ignore no-explicit-any function foo(): any { // ... }

// deno-lint-ignore no-explicit-any explicit-function-return-type function bar(a: any) { // ... } ```

Specyfing rule code that will be ignored is required.

Example output

shell $ ▶ target/debug/examples/dlint ../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