Deno Stylelint: Lint Deno Fresh CSS 🛁 # Deno Stylelint: Lint Deno Fresh CSS 🛁 #

📹 Video #

🖥 Deno Stylelint: Code #

    
1 {
2   "lock": false,
3   "tasks": {
4     "check": "deno fmt --check && deno lint && deno check **/*.ts && deno check **/*.tsx",
5     "lint:css": "deno run --allow-env --allow-read --allow-sys stylelint.ts",
6     "start": "deno run -A --watch=static/,routes/ dev.ts",
7     "build": "deno run -A dev.ts build",
8     "preview": "deno run -A main.ts",
9     "update": "deno run -A -r https://fresh.deno.dev/update ."
10   },
11   "lint": {
12     "rules": {
13       "tags": [
14         "fresh",
15         "recommended"
16       ]
17     }
18   },
19   "exclude": [
20     "**/_fresh/*"
21   ],
22   "imports": {
23    "@/": "./",
24     "$fresh/": "https://deno.land/x/[email protected]/",
25     "@/": "./",
26     "@preact/signals": "https://esm.sh/*@preact/[email protected]",
27     "@preact/signals-core": "https://esm.sh/*@preact/[email protected]",
28     "@std/dotenv": "jsr:@std/dotenv@^0.225.0",
29     "@std/path": "jsr:@std/path@^1.0.2",
30     "preact": "https://esm.sh/[email protected]",
31     "preact/": "https://esm.sh/[email protected]/"
32   },
33   "compilerOptions": {
34     "jsx": "react-jsx",
35     "jsxImportSource": "preact"
36   }
37 }

  

    
1 import { relative, resolve } from "@std/path";
2 import stylelint from "npm:stylelint";
3 import stylelintConfigRecommended from "npm:stylelint-config-recommended";
4 
5 type Severity = "warning" | "error";
6 
7 interface Warning {
8   line: number;
9   column: number;
10   endLine?: number;
11   endColumn?: number;
12   rule: string;
13   severity: Severity;
14   text: string;
15   stylelintType?: string;
16 }
17 
18 interface LintResult {
19   source?: string;
20   deprecations: {
21     text: string;
22     reference?: string;
23   }[];
24   invalidOptionWarnings: {
25     text: string;
26   }[];
27   parseErrors: { stylelintType: string }[];
28   errored?: boolean;
29   warnings: Warning[];
30   ignored?: boolean;
31 }
32 
33 // run
34 const { results }: { results: LintResult[] } = await stylelint.lint({
35   config: {
36     rules: {
37       ...stylelintConfigRecommended.rules,
38       "color-named": "never",
39       "font-family-name-quotes": "always-where-required",
40       "font-weight-notation": "named-where-possible",
41       "function-url-no-scheme-relative": true,
42       "function-url-quotes": "always",
43       "value-keyword-case": ["lower", { ignoreKeywords: ["Raleway"] }],
44       "unit-disallowed-list": [],
45       "no-descending-specificity": true,
46       "no-duplicate-selectors": true,
47       "font-family-no-missing-generic-family-keyword": null,
48       "property-no-unknown": [
49         true,
50         {
51           ignoreProperties: ["/^lost-/"],
52         },
53       ],
54     },
55   },
56   files: "static/**/*.css",
57 });
58 
59 // process
60 const issues: string[] = [];
61 const deprecationWarnings = new Set<string>();
62 
63 const __dirname = resolve();
64 results.forEach(({ deprecations, errored, source, warnings }) => {
65   if (errored && source) {
66     const outputPath = relative(__dirname, source);
67     issues.push(outputPath);
68 
69     warnings.forEach(({ column, line, text }) => {
70       issues.push(` ${line}:${column}  *  ${text}`);
71     });
72     issues.push("");
73   }
74   deprecations.forEach(({ text }) => {
75     deprecationWarnings.add(text);
76   });
77 });
78 
79 // output
80 if (deprecationWarnings.size) {
81   console.log("
82 Deprecation warnings:");
83   deprecationWarnings.forEach((element) => {
84     console.log(` - ${element}`);
85   });
86   console.log("");
87 }
88 
89 if (issues.length) {
90   console.log(issues.join("
91 "));
92   Deno.exit(1);
93 }

  

    
1 /* stylelint-disable font-weight-notation */
2 
3 /* nunito-sans-regular - latin */
4 @font-face {
5   font-family: Nunito Sans;
6   font-style: normal;
7   font-weight: 400;
8   src: local(""),
9     url("/fonts/nunito-sans-v12-latin-regular.woff2") format("woff2"),
10           url("/fonts/nunito-sans-v12-latin-regular.woff") format("woff"); 
11 }
12 
13 /* TRUNCATED... */
14 
15 /* stylelint-enable font-weight-notation */

  

🔗 Links #

• Deno Fresh PostCSS article
• Stylelint docs 
• GitHub repo with full code 
• Element chat: #Rodney matrix chat 
• Twitter handle: @askRodney 

🏁 Deno Stylelint: Summary #

Does Stylelint work with Deno? #

There is not currently a specific Deno Stylelint module, though you can use the Stylelint APIs in a Deno script. We saw you can import the Node Stylelint package in Deno using the Deno NPM import syntax (`import stylelint from "npm:stylelint"`). Then the stylelint object exposes a lint method. You can specify your regular Stylelint configuration as an argument to this lint method call. You can even use predefined rule sets like `stylelint-config-recommended`.

Can you disable a Stylelint rule just for a single CSS file? #

Sometimes, you might want to disable a Stylelint rule locally. This is possible using a comment. Add a disable comment ahead of the block which you don’t want the rule to apply to. Then add an enable comment just afterwards. As an example, let’s say we want to disable the `font-weight-notation` rule. In this case, our enable and disable comments will take the shape: `/* stylelint-disable font-weight-notation */` and `/* stylelint-enable font-weight-notation */`.

How do you emit an exit(1) signal from your Deno script? #

You might want to issue an exit(1) signal to let another process know something wasn’t right! We saw this in a Stylelint setting. When one or more of our rules was broken, we issued exit(1). Then, for example, if we were running Stylelint to check styles automatically before a git commit, the hook could abort when there is an error flagged by exit(1). When the script exits normally, it automatically issues exit(0) so we do not have to do anything in that case. Anyway, to emit the exit(1) just call `Deno.exit(1)` from your Deno script.

🙏🏽 Feedback #

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