Support auto-import completion fourslash tests, fix bugs

[andrewbranch]

Fixes #1873
Fixes #1890

[Copilot]

Pull Request Overview

This PR implements support for auto-import completion in fourslash tests and fixes several bugs related to import organization, package.json parsing, and module resolution. The changes enable comprehensive testing of auto-import functionality while improving the reliability of import-related features.

Key changes:

• Added support for auto-import completion verification in fourslash tests
• Implemented import sorting and organization logic with ESLint-compatible case-insensitive comparison
• Fixed bugs in package.json dependency checking and module specifier resolution
• Added extensive fourslash test coverage for auto-import scenarios

Reviewed Changes

Copilot reviewed 151 out of 151 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
internal/stringutil/compare.go	Added ESLint-compatible case-insensitive string comparison for import sorting
internal/packagejson/packagejson.go	Added HasDependency method to check dependencies across all dependency fields
internal/packagejson/cache.go	Added Parseable field to track package.json parsing status
internal/modulespecifiers/specifiers.go	Fixed logic for handling package.json lookups and module resolution
internal/module/resolver.go	Updated to track package.json parse errors
internal/ls/organizeimports.go	Implemented comprehensive import sorting and organization utilities
internal/ls/completions.go	Refactored completion data structures and fixed symbol-to-origin-info mapping
internal/ls/changetrackerimpl.go	Fixed text formatting issues with suffix handling and newline artifacts
internal/ls/changetracker.go	Added methods for inserting nodes before others and handling import specifier insertion
internal/ls/autoimportsexportinfo.go	Fixed ambient module name comparison by stripping quotes
internal/ls/autoimports.go	Improved package.json filtering, changed export info map structure, and added require statement generation
internal/ls/autoimportfixes.go	Implemented sorted import insertion and specifier addition
internal/fourslash/tests/gen/*_test.go	Added extensive auto-import completion test coverage
testdata/baselines/reference/submodule/compiler/*.diff	Updated test baselines showing improved module resolution behavior

Comments suppressed due to low confidence (2)

internal/ls/organizeimports.go:1

• The function converts strings to lowercase every time, even when the strings are equal. Move the equality check after lowercase conversion to avoid redundant string allocations when strings differ only in case.

package ls

internal/ls/completions.go:1

• Variable sliceEntryData is assigned twice on consecutive lines (3299 and 3300). The second assignment should be to insertEntryData instead.

package ls