Svelte-check ignores most or all warnings

[kvnloughead]

Describe the bug

Hello, I am having issues with svelte-check. It's ignoring most or all TypeScript warnings. You can see the screenshot below, you can see there is a warning in the MoreActions.svelte file, but svelte-check isn't picking up on it. I'm just running svelte-check -- --watch, but I've tried using --fail-on-warning and --threshold warning too. I'm sure that the files are being watched, because if I break things more severely the errors are caught. See both screenshots.

I've been following along with an older set of tutorials on MDN, so I suppose that's related to the issue. I've had a few other issues and have had to make tweaks to the config or package versions, but for the most part it has gone smoothly and everything works. Except this.

Reproduction

Clone the repo at https://github.com/kvnloughead/todo-svelte, and checkout the refactor/typescript branch. Install node modules and run npm run dev. Then run npm run check or npm run check:watch. Do this in vscode, with the svelte for vscode extension. Make some typescript warnings happen, and note that svelte-check doesn't catch them.

Expected behaviour

Svelte-check should display output showing typescript compiler warnings when they exist in the watched files.

System Info

• OS: Linux Mint 21.1 Cinnamon 5.6.8
• IDE: VSCode

Which package is the issue about?

No response

Additional Information, eg. Screenshots

tsconfig.json

{
  "extends": "@tsconfig/svelte/tsconfig.json",

  "include": ["src/**/*"],
  "exclude": ["node_modules/*", "__sapper__/*", "public/*"],
  "compilerOptions": { "ignoreDeprecations": "5.0" }
}

package.json

{
  "name": "svelte-app",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "build": "rollup -c",
    "dev": "rollup -c -w",
    "start": "sirv public --host",
    "check": "svelte-check",
    "check:watch": "svelte-check '--watch'"
  },
  "devDependencies": {
    "@rollup/plugin-commonjs": "^24.0.0",
    "@rollup/plugin-node-resolve": "^15.0.0",
    "@rollup/plugin-terser": "^0.4.0",
    "@rollup/plugin-typescript": "^11.0.0",
    "@tsconfig/svelte": "^3.0.0",
    "rollup": "^3.15.0",
    "rollup-plugin-css-only": "^4.3.0",
    "rollup-plugin-livereload": "^2.0.0",
    "rollup-plugin-svelte": "^7.1.2",
    "svelte-check": "^3.5.2",
    "svelte-preprocess": "^5.0.0",
    "tslib": "^2.5.0",
    "typescript": "^5"
  },
  "dependencies": {
    "sirv-cli": "^2.0.0",
    "svelte": "^4.2.0"
  }
}

svelte.config.js

import sveltePreprocess from 'svelte-preprocess';

export default {
  preprocess: sveltePreprocess()
};

[jasonlyu123]

These are "hints" instead of "warnings", which no longer shows in svelte-check 3 to align with tsc. For the specific cases you might want to adjust your tsconfig.json to enable stricter checking. Like strict for strict preset or any individual flag in the docs.

[kvnloughead]

Oh! Well, you can see that I don't really know what I'm talking about. Thanks for the response, I'll tweak the compiler settings.