Major performance degrade after updating nuxt from 3.6.5 to 3.7

[SimonSimCity]

In a project of mine I updated the package nuxt from version 3.6.5 to 3.7.0 (bcc-code/bmm-web@3ecf83c) after which the performance of eslint degraded by a huge margin. What before was a matter of seconds, now took minutes!

I've chatted a bit in the nuxt forum, and one suggested that this might be an issue with this package.

I created a cpu profile of what was happening [...]

and narrowed it all down to a single vue-operation of my vue-file - a v-for expression (red in the picture above, focussed in the picture below).

What was astonishing now was, that in here, I could see, that the function createDiagnosticExplainingFile, provided by typescript, was called more than once, and the first call took almost equally long before and after updating. But the fact, that after the update it was called multiple times for evaluating the one v-for operation, was an explanation to be for this massive slow-down.

Here's the file I was linting when creating the cpu profile: https://github.com/bcc-code/bmm-web/blob/3ecf83c1a8ea429acccf362fceaaf835e5bbce26/components/MediaPlayer.vue

EDIT: I found the issue #65, and my problem here has the exact same properties - it's slow when providing the parser-option project - but I couldn't confirm that the parser espree or the package typescript-eslint-parser-for-extra-files helped solving the issue.

[SimonSimCity]

Here are some additional tests I tried to check what it was that made my project so slow:

• not providing a project in parserOptions: 2.97s user
• providing a project but disabled the line "extends": "./.nuxt/tsconfig.json", in my tsconfig.json file: 11.76s user
• providing a project and disabling the import section in `.nuxt/tsconfig.json": 13.13s user
• providing a project and disabling the import for ./nuxt.d.ts in `.nuxt/tsconfig.json": 11.73s user
• providing a project and removing the reference for types/imports.d.ts off .nuxt/nuxt.d.ts: 15.58s user

Now, when looking at the file .nuxt/types/imports.d.ts - it's a 2745 lines long generated file of import definitions 😱 - fair enough, before the update it was on 1594 lines and it took 16s user time without and 21.00s with a reference to this file; so there must be something either within the file or in the handling of something.

Comparing this file generated before and after updating revealed, that the import statement of the packages is different. Before it was import('vue') and afterwards the path was changed to an absolute path import('../../node_modules/.pnpm/[email protected][email protected]/node_modules/vue')... this seems suspicious, and my tsconfig runs fast again if I replace it by the old value... I think I found my problem 😅

Here's a flame graph before and after replacing the paths:

[SimonSimCity]

Moved the discussion to the nuxt repo nuxt/nuxt#25257