Refactor: move sourceFileMayBeEmitted to Program interface as requested

Co-authored-by: andrewbranch <3277153+andrewbranch@users.noreply.github.com>

Author: Copilot

internal/checker/checker.go

@@ -535,6 +535,7 @@ type Program interface {
 	GetSourceFileMetaData(path tspath.Path) *ast.SourceFileMetaData
 	GetJSXRuntimeImportSpecifier(path tspath.Path) (moduleReference string, specifier *ast.Node)
 	GetImportHelpersImportSpecifier(path tspath.Path) *ast.Node
+	SourceFileMayBeEmitted(sourceFile *ast.SourceFile, forceDtsEmit bool) bool
 }
 
 type Host interface {
@@ -14517,7 +14518,7 @@ func (c *Checker) resolveExternalModule(location *ast.Node, moduleReference stri
 						diagnostics.This_relative_import_path_is_unsafe_to_rewrite_because_it_looks_like_a_file_name_but_actually_resolves_to_0,
 						relativeToSourceFile,
 					)
-				} else if resolvedModule.ResolvedUsingTsExtension && !shouldRewrite && c.sourceFileMayBeEmitted(sourceFile) {
+				} else if resolvedModule.ResolvedUsingTsExtension && !shouldRewrite && c.program.SourceFileMayBeEmitted(sourceFile, false) {
 					c.error(
 						errorNode,
 						diagnostics.This_import_uses_a_0_extension_to_resolve_to_an_input_TypeScript_file_but_will_not_be_rewritten_during_emit_because_it_is_not_a_relative_path,
@@ -30408,24 +30409,4 @@ func (c *Checker) GetAliasedSymbol(symbol *ast.Symbol) *ast.Symbol {
 	return c.resolveAlias(symbol)
 }
 
-// sourceFileMayBeEmitted is a simplified version of the function in compiler/emitter.go
-// that handles the basic checks needed for import rewrite diagnostics
-func (c *Checker) sourceFileMayBeEmitted(sourceFile *ast.SourceFile) bool {
-	// Declaration files are not emitted
-	if sourceFile.IsDeclarationFile {
-		return false
-	}
-
-	// Source file from node_modules are not emitted
-	if strings.Contains(sourceFile.FileName(), "/node_modules/") {
-		return false
-	}
 
-	// Any non json file should be emitted
-	if !ast.IsJsonSourceFile(sourceFile) {
-		return true
-	}
-
-	// JSON files are generally not emitted
-	return false
-}

internal/compiler/program.go

@@ -946,6 +946,10 @@ func (p *Program) GetImportHelpersImportSpecifier(path tspath.Path) *ast.Node {
 	return p.importHelpersImportSpecifiers[path]
 }
 
+func (p *Program) SourceFileMayBeEmitted(sourceFile *ast.SourceFile, forceDtsEmit bool) bool {
+	return sourceFileMayBeEmitted(sourceFile, &emitHost{program: p}, forceDtsEmit)
+}
+
 var plainJSErrors = core.NewSetFromItems(
 	// binder errors
 	diagnostics.Cannot_redeclare_block_scoped_variable_0.Code(),