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: finder.go
    path of file: ./repos/bud/package/di
    
    the code of the file until where you have to start completion: package di

import (
	"errors"
	"fmt"
	"io/fs"
	"path/filepath"

	"github.com/livebud/bud/package/gomod"
	"github.com/livebud/bud/package/log"
	"github.com/livebud/bud/package/parser"
)

var ErrNoMatch = errors.New("no match")

// Finder finds a declaration that will instantiate the data type
type Finder interface {
	Find(module *gomod.Module, dep Dependency) (Declaration, error)
}

func (i *Injector) Find(currModule *gomod.Module, dep Dependency) (Declaration, error) {
	i.log.Field("for", dep.ID()).Debug("di: finding declaration")
	// If modfile is nil, we default to the project modfile
	if currModule == nil {
		currModule = i.module
	}
	// Use the passed in filesystem if we're in the application module
	// Otherwise use the module's filesystem
	var fsys fs.FS = currModule
	if currModule.Directory() == i.module.Directory() {
		fsys = i.fsys
	}
	// Find the module within the filesystem
	nextModule, err := currModule.FindIn(fsys, dep.ImportPath())
	if err != nil {
		return nil, fmt.Errorf("di: unable to find module for dependency %s . %w", dep.ID(), err)
	}
	// Check again with the newly found module
	if nextModule.Directory() != currModule.Directory() {
		fsys = nextModule
	}
	// Resolve the package directory from within the module
	dir, err := nextModule.ResolveDirectoryIn(fsys, dep.ImportPath())
	if err != nil {
		return nil, fmt.Errorf("di: unable to find directory for dependency %s . %w", dep.ID(), err)
	}
	rel, err := filepath.Rel(nextModule.Directory(), dir)
	if err != nil {
		return nil, err
	}
	pkg, err := parser.New(fsys, nextModule).Parse(rel)
	if err != nil {
		return nil, err
	}
	// Look through the functions
	for _, fn := range pkg.Functions() {
		decl, err := tryFunction(fn, dep.ImportPath(), dep.TypeName())
		if err != nil {
			if err == ErrNoMatch {
				continue
			}
			return nil, err
		}
		i.log.Fields(log.Fields{
			"id":  decl.ID(),
			"for": dep.ID(),
		}).Debug("di: found function declaration")
		
    
func (i *Injector) Find(currModule *gomod.Module, dep Dependency) (Declaration, error) {
	i.log.Field("for", dep.ID()).Debug("di: finding declaration")
	// If modfile is nil, we default to the project modfile
	if currModule == nil {
		currModule = i.module
	}
	// Use the passed in filesystem if we're in the application module
	// Otherwise use the module's filesystem
	var fsys fs.FS = currModule
	if currModule.Directory() == i.module.Directory() {
		fsys = i.fsys
	}
	// Find the module within the filesystem
	nextModule, err := currModule.FindIn(fsys, dep.ImportPath())
	if err != nil {
		return nil, fmt.Errorf("di: unable to find module for dependency %s . %w", dep.ID(), err)
	}
	// Check again with the newly found module
	if nextModule.Directory() != currModule.Directory() {
		fsys = nextModule
	}
	// Resolve the package directory from within the module
	dir, err := nextModule.ResolveDirectoryIn(fsys, dep.ImportPath())
	if err != nil {
		return nil, fmt.Errorf("di: unable to find directory for dependency %s . %w", dep.ID(), err)
	}
	rel, err := filepath.Rel(nextModule.Directory(), dir)
	if err != nil {
		return nil, err
	}
	pkg, err := parser.New(fsys, nextModule).Parse(rel)
	if err != nil {
		return nil, err
	}
	// Look through the functions
	for _, fn := range pkg.Functions() {
		decl, err := tryFunction(fn, dep.ImportPath(), dep.TypeName())
		if err != nil {
			if err == ErrNoMatch {
				continue
			}
			return nil, err
		}
		i.log.Fields(log.Fields{
			"id":  decl.ID(),
			"for": dep.ID(),
		}).Debug("di: found function declaration")
		return decl, nil
	}
	// Look through the structs
	for _, stct := range pkg.Structs() {
		decl, err := tryStruct(stct, dep.TypeName())
		if err != nil {
			if err == ErrNoMatch {
				continue
			}
			return nil, err
		}
		i.log.Fields(log.Fields{
			"id":  decl.ID(),
			"for": dep.ID(),
		}).Debug("di: found struct declaration")
		return decl, nil
	}
	// Look through the type aliases
	for _, alias := range pkg.Aliases() {
		decl, err := tryTypeAlias(alias, dep.TypeName())
		if err != nil {
			if err == ErrNoMatch {
				continue
			}
			return nil, err
		}
		i.log.Fields(log.Fields{
			"id":  decl.ID(),
			"for": dep.ID(),
		}).Debug("di: found struct declaration")
		return decl, nil
	}
	// TODO: add breadcrumbs to help with finding the root of this error
	return nil, fmt.Errorf("di: unclear how to provide %s", dep.ID())
}