Fix various module emit differences

[jakebailey]

Various things I noticed while looking at #1963

[Copilot]

Pull Request Overview

This PR fixes the shouldEmitImportEqualsDeclaration function to match the TypeScript reference implementation. The original ported version had different conditional logic that caused import equals declarations to be omitted in certain scenarios, leading to numerous emit differences in test baselines.

Key Changes

• Simplified the conditional logic in shouldEmitImportEqualsDeclaration to correctly emit import declarations in non-external modules
• Fixed the logic to use OR instead of AND for the conditions, matching TypeScript's behavior

Reviewed Changes

Copilot reviewed 82 out of 83 changed files in this pull request and generated 1 comment.

File	Description
internal/transformers/tstransforms/importelision.go	Corrected the shouldEmitImportEqualsDeclaration function logic to match TypeScript's reference implementation
Multiple baseline .diff files	Test baseline differences removed as the port now converges with stable TypeScript behavior
Multiple baseline reference files	Updated baselines showing correct emission of import equals declarations

[jakebailey]

Regression here.

[jakebailey]

    module x {
        interface c {
        }
    }
    export import a = x.c;
                      ~
!!! error TS2708: Cannot use namespace 'x' as a value.
                        ~
!!! error TS2694: Namespace 'x' has no exported member 'c'.
    export = x;
    ~~~~~~~~~~~
!!! error TS2309: An export assignment cannot be used in a module with other exported elements.

Hard to feel bad about breaking this one though...

[jakebailey]

The old compiler used a boolean | undefined on every symbol for this. Corsa uses a flag but didn't make the behavior match the tristate. Doing this instead to avoid adding a Tristate to all symbols.

[jakebailey]

The old compiler had this func instead which did something special with exports, unlike ConvertVariableDeclarationToAssignmentExpression which is new. Not extremely familiar, though.