Solution found!

https://github.com/idahogurl/vs-code-prettier-eslint/issues/113#issuecomment-1327929167

Rename your .prettierrc file to .prettierrc.cjs

Paste the following as the contents

module.exports = {
    useTabs: true,
    singleQuote: true,
    trailingComma: 'none',
    printWidth: 100,
    plugins: [require('prettier-plugin-svelte')],
    overrides: [{ files: '*.svelte', options: { parser: 'svelte' } }]
};

Prettier ESLint and SvelteKit error repro

This repo reproduces an error occurring with the Prettier ESLint VSCode Extension and SvelteKit

This is a skeleton SvelteKit project created by running npm init svelte@next

Reproduction steps

1. Clone and setup this repo

# Clone
git clone https://github.com/zachstence/prettier-eslint-sveltekit

# Install dependencies
npm i

# Open in VSCode
code prettier-eslint-sveltekit

3. Ensure you have the Prettier ESLint plugin installed in VSCode

4. Follow troubleshooting steps here

5. Observe error in the Output tab

Error: Cannot find module 'prettier-plugin-svelte'
Require stack:
- /home/zach/code/foss/prettier-eslint-sveltekit/node_modules/prettier/index.js
- /home/zach/.vscode-server/extensions/esbenp.prettier-vscode-9.9.0/dist/extension.js
- /home/zach/.vscode-server/bin/6261075646f055b99068d3688932416f2346dd3b/out/vs/loader.js
- /home/zach/.vscode-server/bin/6261075646f055b99068d3688932416f2346dd3b/out/bootstrap-amd.js
- /home/zach/.vscode-server/bin/6261075646f055b99068d3688932416f2346dd3b/out/bootstrap-fork.js
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
    at resolve (node:internal/modules/cjs/helpers:108:19)
    at /home/zach/code/foss/prettier-eslint-sveltekit/node_modules/prettier/index.js:37165:25
    at Array.map (<anonymous>)
    at Object.load (/home/zach/code/foss/prettier-eslint-sveltekit/node_modules/prettier/index.js:37160:65)
    at Object.load [as loadPlugins] (/home/zach/code/foss/prettier-eslint-sveltekit/node_modules/prettier/index.js:15932:23)
    at /home/zach/code/foss/prettier-eslint-sveltekit/node_modules/prettier/index.js:37227:24
    at Object.format (/home/zach/code/foss/prettier-eslint-sveltekit/node_modules/prettier/index.js:37243:12)
    at /home/zach/.vscode-server/extensions/rvest.vs-code-prettier-eslint-5.0.4/dist/extension.js:184:131
    at Lge (/home/zach/.vscode-server/extensions/rvest.vs-code-prettier-eslint-5.0.4/dist/extension.js:180:1160)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)

Check ESLint Configuration

1. Run npx eslint --print-config .eslintrc.js to check if ESLint configuration is valid
2. Observe that config prints successfully

Try ESLint

1. Run npx eslint src/routes/+page.svelte
2. Observe that linting runs successfully

Try prettier-eslint-cli

1. Run npx prettier-eslint-cli src/routes/+page.svelte
2. Observe that formatting completed successfully

<h1>Welcome to SvelteKit</h1>
<p>Visit <a href="https://kit.svelte.dev">kit.svelte.dev</a> to read the documentation</p>
1 file was unchanged