no-store-async.ts

import { createRule } from "../utils"
import { extractStoreReferences } from "./reference-helpers/svelte-store"

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 {
      Program() {
        for (const { node } of extractStoreReferences(context)) {
          const [, fn] = node.arguments
          if (
            !fn ||
            (fn.type !== "ArrowFunctionExpression" &&
              fn.type !== "FunctionExpression") ||
            !fn.async
          ) {
            continue
          }

          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",
          })
        }
      },
    }
  },
})