chore: custom ESLint rule to disable sorting for ref attribute to keep it as last property in JSX to ensure it is up-to-date

packages/calcite-components/.eslintrc.cjs

@@ -12,7 +12,7 @@ module.exports = {
     "plugin:jsdoc/recommended",
     "prettier",
   ],
-  ignorePatterns: ["dist", "docs", "hydrate", "www"],
+  ignorePatterns: ["dist", "docs", "hydrate", "www", ".eslintrc.cjs"],
   parser: "@typescript-eslint/parser",
   parserOptions: {
     tsconfigRootDir: __dirname,

packages/eslint-plugin-calcite-components/README.md

@@ -35,7 +35,7 @@ Add a new `lint` script to `package.json`:
 
 Then you can run the linter:
 
-```
+```javascript
 npm run lint
 ```
 
@@ -49,6 +49,10 @@ This rule helps prevent usage of specific events and allows suggesting alternati
 
 This rule catches props/attributes that should be in the encapsulated HTML structure and not on the host element.
 
+- [`@esri/calcite-components/enforce-ref-last-prop`](./docs/enforce-ref-last-prop.md)
+
+This rule ensures the `ref` attribute is ordered last in a JSXElement to keep it up-to-date.
+
 - [`@esri/calcite-components/require-event-emitter-type`](./docs/require-event-emitter-type.md)
 
 This rule helps enforce the payload type to EventEmitters to avoid misleading `any` type on the CustomEvent detail object.
@@ -62,6 +66,7 @@ This rule catches boolean props that are initialized in a way that does not conf
 ```json
 {
   "@esri/calcite-components/ban-props-on-host": "error",
+  "@esri/calcite-components/enforce-ref-last-prop": "error",
   "@esri/calcite-components/require-event-emitter-type": "error",
   "@esri/calcite-components/strict-boolean-attributes": "error"
 }
@@ -83,4 +88,4 @@ See use restrictions at <http://www.esri.com/legal/pdfs/mla_e204_e300/english>
 
 For additional information, contact: Environmental Systems Research Institute, Inc. Attn: Contracts and Legal Services Department 380 New York Street Redlands, California, USA 92373 USA
 
-email: [email protected]
+email: <[email protected]>

packages/eslint-plugin-calcite-components/docs/enforce-ref-last-prop.md

@@ -0,0 +1,13 @@
+# enforce-ref-last-prop
+
+Ensures the `ref` attribute is ordered last in a JSXElement to keep it up-to-date.
+
+## Config
+
+No config is needed
+
+## Usage
+
+```json
+{ "@esri/calcite-components/enforce-ref-last-prop": "error" }
+```

packages/eslint-plugin-calcite-components/src/configs/base.ts

@@ -7,19 +7,20 @@ export default {
         ecmaVersion: 2018,
         sourceType: "module",
         ecmaFeatures: {
-          jsx: true
-        }
+          jsx: true,
+        },
       },
       env: {
         es2020: true,
-        browser: true
+        browser: true,
       },
       plugins: ["@esri/calcite-components"],
       rules: {
         "@esri/calcite-components/ban-props-on-host": 2,
+        "@esri/calcite-components/enforce-ref-last-prop": 2,
         "@esri/calcite-components/require-event-emitter-type": 2,
-        "@esri/calcite-components/strict-boolean-attributes": 2
-      }
-    }
-  ]
+        "@esri/calcite-components/strict-boolean-attributes": 2,
+      },
+    },
+  ],
 };

packages/eslint-plugin-calcite-components/src/configs/recommended.ts

@@ -2,7 +2,8 @@ export default {
   extends: ["plugin:@esri/calcite-components/base"],
   rules: {
     "@esri/calcite-components/ban-props-on-host": 2,
+    "@esri/calcite-components/enforce-ref-last-prop": 2,
     "@esri/calcite-components/require-event-emitter-type": 2,
-    "@esri/calcite-components/strict-boolean-attributes": 2
-  }
+    "@esri/calcite-components/strict-boolean-attributes": 2,
+  },
 };

packages/eslint-plugin-calcite-components/src/rules/enforce-ref-last-prop.ts

@@ -0,0 +1,43 @@
+import { Rule } from "eslint";
+import type { JSXAttribute, JSXSpreadAttribute, JSXOpeningElement } from "@babel/types";
+
+const rule: Rule.RuleModule = {
+  meta: {
+    docs: {
+      description: `Ensures the "ref" attribute is ordered last in a JSXElement to keep it up-to-date.`,
+      category: "Best Practices",
+      recommended: true,
+    },
+    fixable: "code",
+    schema: [],
+    type: "problem",
+  },
+
+  create(context): Rule.RuleListener {
+    return {
+      JSXIdentifier(node) {
+        const openingElement = node.parent as JSXOpeningElement;
+        if (openingElement.type === "JSXOpeningElement") {
+          const attributes: string[] = [];
+
+          openingElement.attributes.forEach((attr: JSXAttribute | JSXSpreadAttribute) => {
+            if (attr.type === "JSXAttribute" && attr.name?.type === "JSXIdentifier") {
+              attributes.push(attr.name.name);
+            }
+          });
+
+          const refAttribute = attributes.find((attr: string) => attr === "ref");
+
+          if (refAttribute && attributes.indexOf(refAttribute) !== attributes.length - 1) {
+            context.report({
+              node,
+              message: `The "ref" attribute should be the last attribute in a JSXElement.`,
+            });
+          }
+        }
+      },
+    };
+  },
+};
+
+export default rule;

packages/eslint-plugin-calcite-components/src/rules/index.ts

@@ -1,11 +1,13 @@
 import banEvents from "./ban-events";
 import banPropsOnHost from "./ban-props-on-host";
+import enforceRefLastProp from "./enforce-ref-last-prop";
 import requireEventEmitterType from "./require-event-emitter-type";
 import strictBooleanAttributes from "./strict-boolean-attributes";
 
 export default {
   "ban-events": banEvents,
   "ban-props-on-host": banPropsOnHost,
+  "enforce-ref-last-prop": enforceRefLastProp,
   "require-event-emitter-type": requireEventEmitterType,
-  "strict-boolean-attributes": strictBooleanAttributes
+  "strict-boolean-attributes": strictBooleanAttributes,
 };

packages/eslint-plugin-calcite-components/tests/lib/rules/enforce-ref-last-prop/enforce-ref-last-prop.good.tsx

@@ -0,0 +1,22 @@
+// @ts-nocheck
+@Component({ tag: "sample-tag" })
+export class SampleTag {
+  render() {
+    return (
+      <Host>
+        <div
+          class="some-class"
+          id={`${guid}-element`}
+          onClick={() => {
+            /* click! */
+          }}
+          ref={(el: HTMLDivElement): void => {
+            /* refEl */
+          }}
+        >
+          test
+        </div>
+      </Host>
+    );
+  }
+}

packages/eslint-plugin-calcite-components/tests/lib/rules/enforce-ref-last-prop/enforce-ref-last-prop.spec.ts

@@ -0,0 +1,29 @@
+import rule from "../../../../src/rules/enforce-ref-last-prop";
+import { ruleTester } from "stencil-eslint-core";
+import * as path from "path";
+import * as fs from "fs";
+
+const projectPath = path.resolve(__dirname, "../../../tsconfig.json");
+
+describe("enforce-ref-last-prop rule", () => {
+  const files = {
+    good: path.resolve(__dirname, "enforce-ref-last-prop.good.tsx"),
+    wrong: path.resolve(__dirname, "enforce-ref-last-prop.wrong.tsx"),
+  };
+  ruleTester(projectPath).run("enforce-ref-last-prop", rule, {
+    valid: [
+      {
+        code: fs.readFileSync(files.good, "utf8"),
+        filename: files.good,
+      },
+    ],
+
+    invalid: [
+      {
+        code: fs.readFileSync(files.wrong, "utf8"),
+        filename: files.wrong,
+        errors: 1,
+      },
+    ],
+  });
+});

packages/eslint-plugin-calcite-components/tests/lib/rules/enforce-ref-last-prop/enforce-ref-last-prop.wrong.tsx

@@ -0,0 +1,22 @@
+// @ts-nocheck
+@Component({ tag: "sample-tag" })
+export class SampleTag {
+  render() {
+    return (
+      <Host>
+        <div
+          ref={(el: HTMLDivElement): void => {
+            /* refEl */
+          }}
+          class="some-class"
+          id={`${guid}-element`}
+          onClick={() => {
+            /* click! */
+          }}
+        >
+          test
+        </div>
+      </Host>
+    );
+  }
+}