feat: implement stores-no-async rule

Author: baseballyama

src/rules/no-store-async.ts

@@ -0,0 +1,44 @@
+import { createRule } from "../utils"
+import type * as ESTree from "estree"
+
+export default createRule("no-store-async", {
+  meta: {
+    docs: {
+      description:
+        "disallow using async/await inside svelte stores because it causes issues with the auto-unsubscribing features",
+      category: "Possible Errors",
+      recommended: true,
+      default: "error",
+    },
+    schema: [],
+    messages: {
+      unexpected: "Do not pass async functions to svelte stores.",
+    },
+    type: "problem",
+  },
+  create(context) {
+    return {
+      CallExpression(node: ESTree.CallExpression) {
+        if (node.callee.type !== "Identifier") return
+        const { name } = node.callee
+        if (name !== "writable" && name !== "readable" && name !== "derived")
+          return
+        const [, fn] = node.arguments
+        if (fn.type !== "ArrowFunctionExpression" || !fn.async) return
+
+        const start = fn.loc?.start ?? { line: 1, column: 0 }
+        context.report({
+          node: fn,
+          loc: {
+            start,
+            end: {
+              line: start.line,
+              column: start.column + 5,
+            },
+          },
+          messageId: "unexpected",
+        })
+      },
+    }
+  },
+})

src/utils/rules.ts

@@ -21,6 +21,7 @@ import noReactiveFunctions from "../rules/no-reactive-functions"
 import noReactiveLiterals from "../rules/no-reactive-literals"
 import noShorthandStylePropertyOverrides from "../rules/no-shorthand-style-property-overrides"
 import noSpacesAroundEqualSignsInAttribute from "../rules/no-spaces-around-equal-signs-in-attribute"
+import noStoreAsync from "../rules/no-store-async"
 import noTargetBlank from "../rules/no-target-blank"
 import noUnknownStyleDirectiveProperty from "../rules/no-unknown-style-directive-property"
 import noUnusedSvelteIgnore from "../rules/no-unused-svelte-ignore"
@@ -59,6 +60,7 @@ export const rules = [
   noReactiveLiterals,
   noShorthandStylePropertyOverrides,
   noSpacesAroundEqualSignsInAttribute,
+  noStoreAsync,
   noTargetBlank,
   noUnknownStyleDirectiveProperty,
   noUnusedSvelteIgnore,