fix(nuxt): deprecate scanning directory index plugins

[ineshbose]

Transferred from nuxt/framework#10090

#12414
#14358
(Work by nuxt/framework#6544)

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Reopens the closed PR and aims to have consistent behaviour for scanning directories.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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[danielroe]

Marking PR as draft as I'm aware you're considering the right approach. Ping me if I can help at any point.

[ineshbose]

Public Notes on working through PR

Potential points of interest -

nuxt/packages/nuxt/src/app/nuxt.ts

Line 241 in ac682fd

export function normalizePlugins (_plugins: Plugin[]) {

nuxt/packages/nuxt/src/core/templates.ts

Line 87 in ac682fd

export const pluginsDeclaration: NuxtTemplate<TemplateContext> = {

nuxt/packages/kit/src/plugin.ts

Line 72 in ac682fd

export function addPluginTemplate (plugin: NuxtPluginTemplate | string, opts: AddPluginOptions = {}): NuxtPlugin {

Whoops, I think I had forgotten that config plugins aren't globs! Makes this much easier now

The smaller, less reliable solve:

if (/\/plugins\/[^/]+\/index\.[^/]+$/i.test(plugin.src) && !useNuxt().options.plugins.includes(plugin.src)) {
  console.warn(`...`)
}