Summary

• Changed sourceCode.parserServices from throwing an error to returning an empty object {}
• Aligns with ESLint specification for parsers that don't implement parser services
• Prevents crashes in ESLint plugins such as eslint-plugin-better-tailwindcss.

Motivation

According to the ESLint custom parser documentation:

services can contain any parser-dependent services (such as type checkers for nodes). The value of the services property is available to rules as context.sourceCode.parserServices. Default is an empty object.

The current implementation throws an error when parserServices is accessed, which breaks plugins that use defensive checks like:

if(typeof ctx.sourceCode.parserServices?.defineTemplateBodyVisitor === "function"){
  // ...
}

Plugin authors defensively handle:

• ✅ parserServices being undefined
• ✅ defineTemplateBodyVisitor not existing
• ❌ parserServices getter throwing an error (unexpected)

Solution

Return an empty object {} for unimplemented parser services, which:

1. Matches ESLint's documented default behavior
2. Allows plugins' defensive checks to work correctly
3. Provides correct semantics for "not implemented"

Test Plan

• Existing tests should continue to pass
• Plugins using defensive checks like the example above will no longer crash

Related

Fixes the compatibility issue with plugins like eslint-plugin-better-tailwindcss