Fix prettier-plugin-svelte path

[joas8211]

Fixes #7582 according to prettier/prettier-vscode#1261 (comment)

The issue is you have an invalid value set in “plugins”. It’s not a list of plugins, it’s a file path to the plugin. Set the value to ./directory/plugin and it will work.

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[Rich-Harris]

Thank you but I don't think this is right — prettier-plugin-svelte works just fine for me, and specifying ./node_modules/prettier-plugin-svelte risks breaking things in some monorepo setups. The documentation uses the same convention of using conventional module specifiers.

[joas8211]

@Rich-Harris I did some investigation and it seems it only happens when the Svelte Kit project is not in the VSCode workspace root. When the problem occures VSCode Svelte (not Prettier) extension outputs the following.

Error: Cannot find module 'prettier-plugin-svelte'
Require stack:
- /home/joas/files/projects/web/svelte-kit-test/sub/node_modules/prettier/index.js
- /home/joas/.vscode/extensions/svelte.svelte-vscode-107.0.1/node_modules/svelte-language-server/dist/src/importPackage.js
- /home/joas/.vscode/extensions/svelte.svelte-vscode-107.0.1/node_modules/svelte-language-server/dist/src/lib/documents/configLoader.js
- /home/joas/.vscode/extensions/svelte.svelte-vscode-107.0.1/node_modules/svelte-language-server/dist/src/lib/documents/Document.js
- /home/joas/.vscode/extensions/svelte.svelte-vscode-107.0.1/node_modules/svelte-language-server/dist/src/lib/documents/index.js
- /home/joas/.vscode/extensions/svelte.svelte-vscode-107.0.1/node_modules/svelte-language-server/dist/src/server.js
- /home/joas/.vscode/extensions/svelte.svelte-vscode-107.0.1/node_modules/svelte-language-server/bin/server.js
    at Module._resolveFilename (node:internal/modules/cjs/loader:987:15)
    at resolve (node:internal/modules/cjs/helpers:108:19)
    at /home/joas/files/projects/web/svelte-kit-test/sub/node_modules/prettier/index.js:38104:25
    at Array.map (<anonymous>)
    at Object.load (/home/joas/files/projects/web/svelte-kit-test/sub/node_modules/prettier/index.js:38099:65)
    at Object.load [as loadPlugins] (/home/joas/files/projects/web/svelte-kit-test/sub/node_modules/prettier/index.js:16147:23)
    at /home/joas/files/projects/web/svelte-kit-test/sub/node_modules/prettier/index.js:38166:24
    at Object.format (/home/joas/files/projects/web/svelte-kit-test/sub/node_modules/prettier/index.js:38182:12)
    at SveltePlugin.formatDocument (/home/joas/.vscode/extensions/svelte.svelte-vscode-107.0.1/node_modules/svelte-language-server/dist/src/plugins/svelte/SveltePlugin.js:66:40)
    at async PluginHost.tryExecutePlugin (/home/joas/.vscode/extensions/svelte.svelte-vscode-107.0.1/node_modules/svelte-language-server/dist/src/plugins/PluginHost.js:321:20) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
    '/home/joas/files/projects/web/svelte-kit-test/sub/node_modules/prettier/index.js',
    '/home/joas/.vscode/extensions/svelte.svelte-vscode-107.0.1/node_modules/svelte-language-server/dist/src/importPackage.js',
    '/home/joas/.vscode/extensions/svelte.svelte-vscode-107.0.1/node_modules/svelte-language-server/dist/src/lib/documents/configLoader.js',
    '/home/joas/.vscode/extensions/svelte.svelte-vscode-107.0.1/node_modules/svelte-language-server/dist/src/lib/documents/Document.js',
    '/home/joas/.vscode/extensions/svelte.svelte-vscode-107.0.1/node_modules/svelte-language-server/dist/src/lib/documents/index.js',
    '/home/joas/.vscode/extensions/svelte.svelte-vscode-107.0.1/node_modules/svelte-language-server/dist/src/server.js',
    '/home/joas/.vscode/extensions/svelte.svelte-vscode-107.0.1/node_modules/svelte-language-server/bin/server.js'
  ]
}

Maybe the correct way to solve this is to fix the extension.

[Rich-Harris]

cc @dummdidumm!

[Rich-Harris]

closing in favour of sveltejs/language-tools#1766