Routes clash error in dev server when editing file from sveltejs/sapper-template degit app

[btakita]

Run:

degit sveltejs/sapper-template my-app
cd my-app
ncu -au
yarn
npm run dev

Then edit routes/index.html

Error: The index.html and index.html___jb_tmp___ routes clash
    at /home/user/my-app/node_modules/sapper/dist/core.ts.js:204:15
    at Array.sort (native)
    at Object.create_routes (/home/user/my-app/node_modules/sapper/dist/core.ts.js:172:10)
    at FSWatcher.<anonymous> (/home/user/my-app/node_modules/sapper/dist/dev.ts.js:164:51)
    at FSWatcher.emit (events.js:180:13)
    at FSWatcher.<anonymous> (/home/user/my-app/node_modules/chokidar/index.js:199:15)
    at FSWatcher._emit (/home/user/my-app/node_modules/chokidar/index.js:241:5)
    at FSWatcher.NodeFsHandler._handleFile (/home/user/my-app/node_modules/chokidar/lib/nodefs-handler.js:276:10)
    at FSWatcher.<anonymous> (/home/user/my-app/node_modules/chokidar/lib/nodefs-handler.js:474:21)
    at FSReqWrap.oncomplete (fs.js:171:5)

As you can see above, I ran npm-check-updates.
Here is my package.json:

{
  "name": "TODO",
  "description": "TODO",
  "version": "0.0.1",
  "scripts": {
    "dev": "sapper dev",
    "build": "sapper build",
    "export": "sapper export",
    "start": "sapper start",
    "cy:run": "cypress run",
    "cy:open": "cypress open",
    "test": "run-p --race dev cy:run"
  },
  "dependencies": {
    "compression": "^1.7.2",
    "npm-run-all": "^4.1.2",
    "polka": "^0.3.4",
    "sapper": "^0.10.2",
    "serve-static": "^1.13.2",
    "svelte": "^1.58.5",
    "svelte-loader": "^2.5.1",
    "webpack": "^4.4.1"
  }
}

[btakita]

#217

[btakita]

I'm using Webstorm, & it looks like Jetbrains IDEs create a temporary file on update:

index.html___jb_tmp___

In this case, I would have to disable "Safe Write".

https://stackoverflow.com/questions/23864827/jb-bak-and-jb-old-files-in-pycharm#27449850

Of course, it would be great to have this issue fixed on the sapper side.

[Rich-Harris]

Thanks — in 0.19.2, files with extensions that aren't just [a-z]+ are ignored, preventing these kinds of clashes