You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: input.go
    path of file: ./repos/esbuild/internal/graph
    
    the code of the file until where you have to start completion: package graph

// The code in this file mainly represents data that passes from the scan phase
// to the compile phase of the bundler. There is currently one exception: the
// "
    
func (repr *JSRepr) TopLevelSymbolToParts(ref ast.Ref) []uint32 {
	// Overlay the mutable map from the linker
	if parts, ok := repr.Meta.TopLevelSymbolToPartsOverlay[ref]; ok {
		return parts
	}

	// Fall back to the immutable map from the parser
	return repr.AST.TopLevelSymbolToPartsFromParser[ref]
}