`no-duplicates` fails for svelte packages with shared type definitions file

[sviripa]

Repro repo

ESLint config

import js from "@eslint/js";
import { includeIgnoreFile } from "@eslint/compat";
import svelte from "eslint-plugin-svelte";
import globals from "globals";
import { fileURLToPath } from "node:url";
import ts from "typescript-eslint";
import * as pluginImportX from "eslint-plugin-import-x";
import svelteConfig from "./svelte.config.js";

const gitignorePath = fileURLToPath(new URL("./.gitignore", import.meta.url));

export default ts.config(
  includeIgnoreFile(gitignorePath),
  js.configs.recommended,
  ...ts.configs.recommended,
  ...svelte.configs.recommended,
  pluginImportX.flatConfigs.recommended,
  {
    languageOptions: {
      globals: { ...globals.browser, ...globals.node },
    },
    rules: {
      // typescript-eslint strongly recommend that you do not use the no-undef lint rule on TypeScript projects.
      // see: https://typescript-eslint.io/troubleshooting/faqs/eslint/#i-get-errors-from-the-no-undef-rule-about-global-variables-not-being-defined-even-though-there-are-no-typescript-errors
      "no-undef": "off",
    },
  },
  {
    settings: {
      "import-x/parsers": {
        "@typescript-eslint/parser": [".ts", ".tsx", ".mts", ".mjs"],
      },
      "import-x/resolver": {
        typescript: true,
      },
    },
  },
  {
    files: ["**/*.svelte", "**/*.svelte.ts", "**/*.svelte.js"],
    languageOptions: {
      parserOptions: {
        projectService: true,
        extraFileExtensions: [".svelte"],
        parser: ts.parser,
        svelteConfig,
      },
    },
  }
);

Code:

<script lang="ts">
  import { onMount } from "svelte";
  import { fly } from 'svelte/transition'
</script>

Eslint output:

/Users/bohdan/Development/eslint-import-no-dup/src/routes/+page.svelte
  2:12  error    'onMount' is defined but never used                                                                                                             @typescript-eslint/no-unused-vars
  2:27  warning  '/Users/bohdan/Development/eslint-import-no-dup/node_modules/.pnpm/svelte@5.27.2/node_modules/svelte/types/index.d.ts' imported multiple times  import-x/no-duplicates
  3:12  error    'fly' is defined but never used                                                                                                                 @typescript-eslint/no-unused-vars
  3:23  warning  '/Users/bohdan/Development/eslint-import-no-dup/node_modules/.pnpm/svelte@5.27.2/node_modules/svelte/types/index.d.ts' imported multiple times  import-x/no-duplicates

Eslint autofix rewrites the imports to just import { onMount, fly } from "svelte"; however, svelte package does not export fly.

Is there any way to configure import-x plugin to not resolve by types for svelte and its subpackages?

[sviripa]

svelte and svelte/transition use the same types file according to svelte's package.json:

{
  "name": "svelte",
  "description": "Cybernetically enhanced web apps",
  "license": "MIT",
  "version": "5.27.2",
  "type": "module",
  "types": "./types/index.d.ts",
  "engines": {
    "node": ">=18"
  },
  "files": [
    "*.d.ts",
    "src",
    "!src/**/*.test.*",
    "!src/**/*.d.ts",
    "types",
    "compiler",
    "README.md"
  ],
  "module": "src/index-client.js",
  "main": "src/index-client.js",
  "exports": {
    ".": {
      "types": "./types/index.d.ts",
      "worker": "./src/index-server.js",
      "browser": "./src/index-client.js",
      "default": "./src/index-server.js"
    },
    "./package.json": "./package.json",
    "./action": {
      "types": "./types/index.d.ts"
    },
    "./animate": {
      "types": "./types/index.d.ts",
      "default": "./src/animate/index.js"
    },
    "./compiler": {
      "types": "./types/index.d.ts",
      "require": "./compiler/index.js",
      "default": "./src/compiler/index.js"
    },
    "./easing": {
      "types": "./types/index.d.ts",
      "default": "./src/easing/index.js"
    },
    "./elements": {
      "types": "./elements.d.ts"
    },
    "./internal": {
      "default": "./src/internal/index.js"
    },
    "./internal/client": {
      "default": "./src/internal/client/index.js"
    },
    "./internal/disclose-version": {
      "default": "./src/internal/disclose-version.js"
    },
    "./internal/flags/legacy": {
      "default": "./src/internal/flags/legacy.js"
    },
    "./internal/flags/tracing": {
      "default": "./src/internal/flags/tracing.js"
    },
    "./internal/server": {
      "default": "./src/internal/server/index.js"
    },
    "./legacy": {
      "types": "./types/index.d.ts",
      "worker": "./src/legacy/legacy-server.js",
      "browser": "./src/legacy/legacy-client.js",
      "default": "./src/legacy/legacy-server.js"
    },
    "./motion": {
      "types": "./types/index.d.ts",
      "default": "./src/motion/index.js"
    },
    "./reactivity": {
      "types": "./types/index.d.ts",
      "worker": "./src/reactivity/index-server.js",
      "browser": "./src/reactivity/index-client.js",
      "default": "./src/reactivity/index-server.js"
    },
    "./reactivity/window": {
      "types": "./types/index.d.ts",
      "default": "./src/reactivity/window/index.js"
    },
    "./server": {
      "types": "./types/index.d.ts",
      "default": "./src/server/index.js"
    },
    "./store": {
      "types": "./types/index.d.ts",
      "worker": "./src/store/index-server.js",
      "browser": "./src/store/index-client.js",
      "default": "./src/store/index-server.js"
    },
    "./transition": {
      "types": "./types/index.d.ts",
      "default": "./src/transition/index.js"
    },
    "./events": {
      "types": "./types/index.d.ts",
      "default": "./src/events/index.js"
    }
  },
}

[JounQin]

This is a known issue and we want to resolve this in next major:

import-js/eslint-plugin-import#1479

#235 (comment)

cc @SukkaW

[vladshcherbin]

Does it resolves if used with any next resolvers current version?

[JounQin]

Does it resolves if used with any next resolvers current version?

Unless you don't use resolver-typescript which prefers .d.ts over .js. For example use createNodeResolver instead.

But this would have other issues, for example, if A is a type, import {A} from 'foo' will results A not found in exports for Node resolver but typescript resolver just works.

In the meantime, I think an ESLint disable comment is good enough.