Replace Empty Slice Literals with Nil Slices (#13093)

Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>

beacon-chain/cache/depositsnapshot/deposit_cache_test.go

@@ -769,7 +769,7 @@ func TestFinalizedDeposits_ReturnsTrieCorrectly(t *testing.T) {
 		}
 	}
 
-	ctrs := []*ethpb.DepositContainer{}
+	var ctrs []*ethpb.DepositContainer
 	for i := 0; i < 2000; i++ {
 		ctrs = append(ctrs, generateCtr(uint64(10+(i/2)), int64(i)))
 	}

beacon-chain/execution/engine_client.go

@@ -622,9 +622,9 @@ func (s *Service) ReconstructFullBellatrixBlockBatch(
 	if len(blindedBlocks) == 0 {
 		return []interfaces.SignedBeaconBlock{}, nil
 	}
-	executionHashes := []common.Hash{}
-	validExecPayloads := []int{}
-	zeroExecPayloads := []int{}
+	var executionHashes []common.Hash
+	var validExecPayloads []int
+	var zeroExecPayloads []int
 	for i, b := range blindedBlocks {
 		if err := blocks.BeaconBlockIsNil(b); err != nil {
 			return nil, errors.Wrap(err, "cannot reconstruct bellatrix block from nil data")

beacon-chain/p2p/discovery.go

@@ -461,7 +461,7 @@ func convertToUdpMultiAddr(node *enode.Node) ([]ma.Multiaddr, error) {
 }
 
 func peerIdsFromMultiAddrs(addrs []ma.Multiaddr) []peer.ID {
-	peers := []peer.ID{}
+	var peers []peer.ID
 	for _, a := range addrs {
 		info, err := peer.AddrInfoFromP2pAddr(a)
 		if err != nil {

beacon-chain/p2p/peers/peerdata/store.go

@@ -118,7 +118,7 @@ func (s *Store) SetTrustedPeers(peers []peer.ID) {
 // GetTrustedPeers gets our desired trusted peer ids.
 // Important: it is assumed that store mutex is locked when calling this method.
 func (s *Store) GetTrustedPeers() []peer.ID {
-	peers := []peer.ID{}
+	var peers []peer.ID
 	for p := range s.trustedPeers {
 		peers = append(peers, p)
 	}

beacon-chain/p2p/peers/status_test.go

@@ -788,7 +788,7 @@ func TestPrunePeers_TrustedPeers(t *testing.T) {
 		createPeer(t, p, nil, network.DirInbound, peerdata.PeerConnectionState(ethpb.ConnectionState_CONNECTED))
 	}
 
-	trustedPeers := []peer.ID{}
+	var trustedPeers []peer.ID
 	// Set up bad scores for inbound peers.
 	inboundPeers := p.InboundConnected()
 	for i, pid := range inboundPeers {

beacon-chain/rpc/prysm/node/handlers.go

@@ -86,7 +86,7 @@ func (s *Server) AddTrustedPeer(w http.ResponseWriter, r *http.Request) {
 		s.PeersFetcher.Peers().Add(nil, info.ID, info.Addrs[0], direction)
 	}
 
-	peers := []peer.ID{}
+	var peers []peer.ID
 	peers = append(peers, info.ID)
 	s.PeersFetcher.Peers().SetTrustedPeers(peers)
 	w.WriteHeader(http.StatusOK)
@@ -112,7 +112,7 @@ func (s *Server) RemoveTrustedPeer(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	peers := []peer.ID{}
+	var peers []peer.ID
 	peers = append(peers, peerId)
 	s.PeersFetcher.Peers().DeleteTrustedPeers(peers)
 	w.WriteHeader(http.StatusOK)

cmd/prysmctl/deprecated/cmd.go

@@ -5,7 +5,7 @@ import (
 	"github.com/urfave/cli/v2"
 )
 
-var Commands = []*cli.Command{}
+var Commands []*cli.Command
 
 func init() {
 	Commands = append(Commands, checkpoint.Commands...)

cmd/validator/wallet/create.go

@@ -47,7 +47,7 @@ func walletCreate(c *cli.Context) error {
 
 // ConstructCLIManagerOpts prompts the user for wallet creation input.
 func ConstructCLIManagerOpts(cliCtx *cli.Context, keymanagerKind keymanager.Kind) ([]accounts.Option, error) {
-	cliOpts := []accounts.Option{}
+	var cliOpts []accounts.Option
 	// Get wallet dir and check that no wallet exists at the location.
 	walletDir, err := userprompt.InputDirectory(cliCtx, userprompt.WalletDirPromptText, flags.WalletDirFlag)
 	if err != nil {

config/features/deprecated_flags.go

@@ -70,4 +70,4 @@ var deprecatedFlags = []cli.Flag{
 
 // deprecatedBeaconFlags contains flags that are still used by other components
 // and therefore cannot be added to deprecatedFlags
-var deprecatedBeaconFlags = []cli.Flag{}
+var deprecatedBeaconFlags []cli.Flag

crypto/bls/blst/public_key_test.go

@@ -94,7 +94,7 @@ func TestPublicKey_Aggregate(t *testing.T) {
 }
 
 func TestPublicKey_Aggregation_NoCorruption(t *testing.T) {
-	pubkeys := []common.PublicKey{}
+	var pubkeys []common.PublicKey
 	for i := 0; i < 100; i++ {
 		priv, err := blst.RandKey()
 		require.NoError(t, err)
@@ -102,7 +102,7 @@ func TestPublicKey_Aggregation_NoCorruption(t *testing.T) {
 		pubkeys = append(pubkeys, pubkey)
 	}
 
-	compressedKeys := [][]byte{}
+	var compressedKeys [][]byte
 	// Fill up the cache
 	for _, pkey := range pubkeys {
 		_, err := blst.PublicKeyFromBytes(pkey.Marshal())

runtime/version/fork.go

@@ -20,7 +20,7 @@ var versionToString = map[int]string{
 
 // stringToVersion and allVersions are populated in init()
 var stringToVersion = map[string]int{}
-var allVersions = []int{}
+var allVersions []int
 
 // ErrUnrecognizedVersionName means a string does not match the list of canonical version names.
 var ErrUnrecognizedVersionName = errors.New("version name doesn't map to a known value in the enum")

testing/endtoend/evaluators/operations.go

@@ -153,7 +153,7 @@ func processesDepositsInBlocks(ec *e2etypes.EvaluationContext, conns ...*grpc.Cl
 			observed[k] = v + d.Data.Amount
 		}
 	}
-	mismatches := []string{}
+	var mismatches []string
 	for k, ev := range expected {
 		ov := observed[k]
 		if ev != ov {
@@ -361,7 +361,7 @@ func proposeVoluntaryExit(ec *e2etypes.EvaluationContext, conns ...*grpc.ClientC
 	if err != nil {
 		return errors.Wrap(err, "could not get state")
 	}
-	execIndices := []int{}
+	var execIndices []int
 	err = st.ReadFromEveryValidator(func(idx int, val state.ReadOnlyValidator) error {
 		if val.WithdrawalCredentials()[0] == params.BeaconConfig().ETH1AddressWithdrawalPrefixByte {
 			execIndices = append(execIndices, idx)

testing/middleware/builder/builder.go

@@ -244,7 +244,7 @@ func (p *Builder) isBuilderCall(req *http.Request) bool {
 }
 
 func (p *Builder) registerValidators(w http.ResponseWriter, req *http.Request) {
-	registrations := []shared.SignedValidatorRegistration{}
+	var registrations []shared.SignedValidatorRegistration
 	if err := json.NewDecoder(req.Body).Decode(&registrations); err != nil {
 		http.Error(w, "invalid request", http.StatusBadRequest)
 		return

validator/client/beacon-api/activation.go

@@ -60,7 +60,7 @@ func (c *waitForActivationClient) Recv() (*ethpb.ValidatorActivationResponse, er
 		// Contains all keys in targetPubKeys but not in retrievedPubKeys
 		var missingPubKeys [][]byte
 
-		statuses := []*ethpb.ValidatorActivationResponse_Status{}
+		var statuses []*ethpb.ValidatorActivationResponse_Status
 
 		for index, publicKey := range c.ValidatorActivationRequest.PublicKeys {
 			stringPubKey := hexutil.Encode(publicKey)

validator/client/beacon-api/status.go

@@ -55,7 +55,7 @@ func (c *beaconApiValidatorClient) getValidatorsStatusResponse(ctx context.Conte
 	stringRetrievedPubKeys := make(map[string]struct{})
 
 	// Contains all keys in targetPubKeys but not in retrievedPubKeys
-	missingPubKeys := [][]byte{}
+	var missingPubKeys [][]byte
 
 	totalLen := len(inPubKeys) + len(inIndexes)