diff --git a/types/nodegit/attr.d.ts b/types/nodegit/attr.d.ts
index fdcf4dc56b..c7b2d3ea22 100644
--- a/types/nodegit/attr.d.ts
+++ b/types/nodegit/attr.d.ts
@@ -1,7 +1,7 @@
 import { Repository } from './repository';
 
 export namespace Attr {
-    enum STATES {
+    const enum STATES {
         UNSPECIFIED_T = 0,
         TRUE_T = 1,
         FALSE_T = 2,
diff --git a/types/nodegit/blame.d.ts b/types/nodegit/blame.d.ts
index c6efdc133b..684db81b6c 100644
--- a/types/nodegit/blame.d.ts
+++ b/types/nodegit/blame.d.ts
@@ -3,7 +3,7 @@ import { BlameOptions } from './blame-options';
 import {BlameHunk} from './blame-hunk';
 
 export namespace Blame {
-    enum FLAG {
+    const enum FLAG {
         NORMAL = 0,
         TRACK_COPIES_SAME_FILE = 1,
         TRACK_COPIES_SAME_COMMIT_MOVES = 2,
diff --git a/types/nodegit/branch.d.ts b/types/nodegit/branch.d.ts
index 0c52131a51..47bd1ec76f 100644
--- a/types/nodegit/branch.d.ts
+++ b/types/nodegit/branch.d.ts
@@ -4,7 +4,7 @@ import { Commit } from './commit';
 import { AnnotatedCommit } from './annotated-commit';
 
 export namespace Branch {
-    enum BRANCH {
+    const enum BRANCH {
         LOCAL = 1,
         REMOTE = 2,
         ALL = 3
diff --git a/types/nodegit/cert.d.ts b/types/nodegit/cert.d.ts
index f910453700..fd749beba9 100644
--- a/types/nodegit/cert.d.ts
+++ b/types/nodegit/cert.d.ts
@@ -1,12 +1,12 @@
 export namespace Cert {
-    enum TYPE {
+    const enum TYPE {
         NONE = 0,
         X509 = 1,
         HOSTKEY_LIBSSH2 = 2,
         STRARRAY = 3
     }
 
-    enum SSH {
+    const enum SSH {
         MD5 = 1,
         SHA1 = 2
     }
diff --git a/types/nodegit/checkout.d.ts b/types/nodegit/checkout.d.ts
index a7bc6d63fc..af5f66faf3 100644
--- a/types/nodegit/checkout.d.ts
+++ b/types/nodegit/checkout.d.ts
@@ -7,7 +7,7 @@ import { Commit } from './commit';
 import { Index } from './index';
 
 export namespace Checkout {
-    enum NOTIFY {
+    const enum NOTIFY {
         NONE = 0,
         CONFLICT = 1,
         DIRTY = 2,
@@ -17,7 +17,7 @@ export namespace Checkout {
         ALL = 65535
     }
 
-    enum STRATEGY {
+    const enum STRATEGY {
         NONE = 0,
         SAFE = 1,
         FORCE = 2,
diff --git a/types/nodegit/clone.d.ts b/types/nodegit/clone.d.ts
index e0b92bb9ea..c038a8e26a 100644
--- a/types/nodegit/clone.d.ts
+++ b/types/nodegit/clone.d.ts
@@ -2,7 +2,7 @@ import { Repository } from './repository';
 import { CloneOptions } from './clone-options';
 
 export namespace Clone {
-    enum LOCAL {
+    const enum LOCAL {
         AUTO = 0,
         LOCAL = 1,
         NO_LOCAL = 2,
diff --git a/types/nodegit/config.d.ts b/types/nodegit/config.d.ts
index ad8df1a327..ea61c52d3c 100644
--- a/types/nodegit/config.d.ts
+++ b/types/nodegit/config.d.ts
@@ -1,7 +1,7 @@
 import { Buf } from './buf';
 
 export namespace Config {
-    enum LEVEL {
+    const enum LEVEL {
         SYSTEM = 1,
         XDG = 2,
         GLOBAL = 3,
diff --git a/types/nodegit/cred.d.ts b/types/nodegit/cred.d.ts
index 759e43d814..9de014311b 100644
--- a/types/nodegit/cred.d.ts
+++ b/types/nodegit/cred.d.ts
@@ -1,5 +1,5 @@
 export namespace Cred {
-    enum TYPE {
+    const enum TYPE {
         USERPASS_PLAINTEXT = 1,
         SSH_KEY = 2,
         SSH_CUSTOM = 4,
diff --git a/types/nodegit/diff-binary.d.ts b/types/nodegit/diff-binary.d.ts
index fa6643038d..d01181c92a 100644
--- a/types/nodegit/diff-binary.d.ts
+++ b/types/nodegit/diff-binary.d.ts
@@ -1,7 +1,7 @@
 import { DiffBinaryFile } from './diff-binary-file';
 
 export namespace DiffBinary {
-    enum DIFF_BINARY {
+    const enum DIFF_BINARY {
         NONE = 0,
         LITERAL = 1,
         DELTA = 2
diff --git a/types/nodegit/diff.d.ts b/types/nodegit/diff.d.ts
index d675b36acf..6926527124 100644
--- a/types/nodegit/diff.d.ts
+++ b/types/nodegit/diff.d.ts
@@ -18,7 +18,7 @@ export interface DiffFindOptions {
 }
 
 export namespace Diff {
-    enum DELTA {
+    const enum DELTA {
         UNMODIFIED = 0,
         ADDED = 1,
         DELETED = 2,
@@ -32,7 +32,7 @@ export namespace Diff {
         CONFLICTED = 10
     }
 
-    enum FIND {
+    const enum FIND {
         BY_CONFIG = 0,
         RENAMES = 1,
         RENAMES_FROM_REWRITES = 2,
@@ -51,14 +51,14 @@ export namespace Diff {
         REMOVE_UNMODIFIED = 65536
     }
 
-    enum FLAG {
+    const enum FLAG {
         BINARY = 1,
         NOT_BINARY = 2,
         VALID_ID = 4,
         EXISTS = 8
     }
 
-    enum FORMAT {
+    const enum FORMAT {
         PATCH = 1,
         PATCH_HEADER = 2,
         RAW = 3,
@@ -66,12 +66,12 @@ export namespace Diff {
         NAME_STATUS = 5
     }
 
-    enum FORMAT_EMAIL_FLAGS {
+    const enum FORMAT_EMAIL_FLAGS {
         FORMAT_EMAIL_NONE = 0,
         FORMAT_EMAIL_EXCLUDE_SUBJECT_PATCH_MARKER = 1
     }
 
-    enum LINE {
+    const enum LINE {
         CONTEXT = 32,
         ADDITION = 43,
         DELETION = 45,
@@ -83,7 +83,7 @@ export namespace Diff {
         BINARY = 66
     }
 
-    enum OPTION {
+    const enum OPTION {
         NORMAL = 0,
         REVERSE = 1,
         INCLUDE_IGNORED = 2,
@@ -115,7 +115,7 @@ export namespace Diff {
         SHOW_BINARY = 1073741824
     }
 
-    enum STATS_FORMAT {
+    const enum STATS_FORMAT {
         STATS_NONE = 0,
         STATS_FULL = 1,
         STATS_SHORT = 2,
diff --git a/types/nodegit/enums.d.ts b/types/nodegit/enums.d.ts
index 850979ac51..4fb44850ca 100644
--- a/types/nodegit/enums.d.ts
+++ b/types/nodegit/enums.d.ts
@@ -1,23 +1,23 @@
 export namespace Enums {
-    enum CVAR {
+    const enum CVAR {
         FALSE = 0,
         TRUE = 1,
         INT32 = 2,
         string = 3
     }
 
-    enum DIRECTION {
+    const enum DIRECTION {
         FETCH = 0,
         PUSH = 1
     }
 
-    enum FEATURE {
+    const enum FEATURE {
         THREADS = 1,
         HTTPS = 2,
         SSH = 4
     }
 
-    enum IDXENTRY_EXTENDED_FLAG {
+    const enum IDXENTRY_EXTENDED_FLAG {
         IDXENTRY_INTENT_TO_ADD = 8192,
         IDXENTRY_SKIP_WORKTREE = 16384,
         IDXENTRY_EXTENDED2 = 32768,
@@ -34,7 +34,7 @@ export namespace Enums {
         IDXENTRY_NEW_SKIP_WORKTREE = 512
     }
 
-    enum INDXENTRY_FLAG {
+    const enum INDXENTRY_FLAG {
         IDXENTRY_EXTENDED = 16384,
         IDXENTRY_VALID = 32768
     }
diff --git a/types/nodegit/error.d.ts b/types/nodegit/error.d.ts
index e1267c082b..c259749e8b 100644
--- a/types/nodegit/error.d.ts
+++ b/types/nodegit/error.d.ts
@@ -1,5 +1,5 @@
 export namespace Error {
-    enum ERROR {
+    const enum ERROR {
         GITERR_NONE = 0,
         GITERR_NOMEMORY = 1,
         GITERR_OS = 2,
@@ -33,7 +33,7 @@ export namespace Error {
         GITERR_FILESYSTEM = 30
     }
 
-    enum CODE {
+    const enum CODE {
         OK = 0,
         ERROR = -1,
         ENOTFOUND = -3,
diff --git a/types/nodegit/fetch.d.ts b/types/nodegit/fetch.d.ts
index 2e71097ba3..db0980586f 100644
--- a/types/nodegit/fetch.d.ts
+++ b/types/nodegit/fetch.d.ts
@@ -1,7 +1,7 @@
 import { FetchOptions } from './fetch-options';
 
 export namespace Fetch {
-    enum PRUNE {
+    const enum PRUNE {
         GIT_FETCH_PRUNE_UNSPECIFIED = 0,
         GIT_FETCH_PRUNE = 1,
         GIT_FETCH_NO_PRUNE = 2
diff --git a/types/nodegit/filter.d.ts b/types/nodegit/filter.d.ts
index da1f71c2b9..066a51183e 100644
--- a/types/nodegit/filter.d.ts
+++ b/types/nodegit/filter.d.ts
@@ -5,12 +5,12 @@ import { Blob } from './blob';
 import { Buf } from './buf';
 
 export namespace Filter {
-    enum FLAG {
+    const enum FLAG {
         DEFAULT = 0,
         ALLOW_UNSAFE = 1
     }
 
-    enum MODE {
+    const enum MODE {
         TO_WORKTREE = 0,
         SMUDGE = 0,
         TO_ODB = 1,
diff --git a/types/nodegit/hash-sig.d.ts b/types/nodegit/hash-sig.d.ts
index afa9bc121c..5e9897450f 100644
--- a/types/nodegit/hash-sig.d.ts
+++ b/types/nodegit/hash-sig.d.ts
@@ -1,5 +1,5 @@
 export namespace Hashsig {
-    enum OPTION {
+    const enum OPTION {
         NORMAL = 0,
         IGNORE_WHITESPACE = 1,
         SMART_WHITESPACE = 2,
diff --git a/types/nodegit/index_.d.ts b/types/nodegit/index_.d.ts
index 9902b53d35..6fd80f5047 100644
--- a/types/nodegit/index_.d.ts
+++ b/types/nodegit/index_.d.ts
@@ -5,14 +5,14 @@ import { Tree } from './tree';
 import { Strarray } from './str-array';
 
 export namespace Index {
-    enum ADD_OPTION {
+    const enum ADD_OPTION {
         ADD_DEFAULT = 0,
         ADD_FORCE = 1,
         ADD_DISABLE_PATHSPEC_MATCH = 2,
         ADD_CHECK_PATHSPEC = 4
     }
 
-    enum CAP {
+    const enum CAP {
         IGNORE_CASE = 1,
         NO_FILEMODE = 2,
         NO_SYMLINKS = 4,
diff --git a/types/nodegit/lib-git2.d.ts b/types/nodegit/lib-git2.d.ts
index 9d7f1a5281..be5a5d1856 100644
--- a/types/nodegit/lib-git2.d.ts
+++ b/types/nodegit/lib-git2.d.ts
@@ -1,5 +1,5 @@
 export namespace Libgit2 {
-    enum OPT {
+    const enum OPT {
         GET_MWINDOW_SIZE = 0,
         SET_MWINDOW_SIZE = 1,
         GET_MWINDOW_MAPPED_LIMIT = 2,
diff --git a/types/nodegit/merge.d.ts b/types/nodegit/merge.d.ts
index fb135e178f..737d3c5a04 100644
--- a/types/nodegit/merge.d.ts
+++ b/types/nodegit/merge.d.ts
@@ -10,7 +10,7 @@ import { MergeOptions } from './merge-options';
 import { MergeFileInput } from './merge-file-input';
 
 export namespace Merge {
-    enum ANALYSIS {
+    const enum ANALYSIS {
         NONE = 0,
         NORMAL = 1,
         UP_TO_DATE = 2,
@@ -18,14 +18,14 @@ export namespace Merge {
         UNBORN = 8
     }
 
-    enum FILE_FAVOR {
+    const enum FILE_FAVOR {
         NORMAL = 0,
         OURS = 1,
         THEIRS = 2,
         UNION = 3
     }
 
-    enum FILE_FLAGS {
+    const enum FILE_FLAGS {
         FILE_DEFAULT = 0,
         FILE_STYLE_MERGE = 1,
         FILE_STYLE_DIFF3 = 2,
@@ -37,13 +37,13 @@ export namespace Merge {
         FILE_DIFF_MINIMAL = 128
     }
 
-    enum PREFERENCE {
+    const enum PREFERENCE {
         NONE = 0,
         NO_FASTFORWARD = 1,
         FASTFORWARD_ONLY = 2
     }
 
-    enum TREE_FLAG {
+    const enum TREE_FLAG {
         TREE_FIND_RENAMES = 1
     }
 }
diff --git a/types/nodegit/odb.d.ts b/types/nodegit/odb.d.ts
index f43f1673db..c0cbfd8725 100644
--- a/types/nodegit/odb.d.ts
+++ b/types/nodegit/odb.d.ts
@@ -2,7 +2,7 @@ import { Oid } from './oid';
 import { OdbObject } from './odb-object';
 
 export namespace Odb {
-    enum STREAM {
+    const enum STREAM {
         RDONLY = 2,
         WRONLY = 4,
         RW = 6
diff --git a/types/nodegit/pack-builder.d.ts b/types/nodegit/pack-builder.d.ts
index 0f21f5f328..ed0fa0a2cc 100644
--- a/types/nodegit/pack-builder.d.ts
+++ b/types/nodegit/pack-builder.d.ts
@@ -3,7 +3,7 @@ import { Oid } from './oid';
 import { Revwalk } from './rev-walk';
 
 export namespace Packbuilder {
-    enum STAGE {
+    const enum STAGE {
         ADDING_OBJECTS = 0,
         DELTAFICATION = 1
     }
diff --git a/types/nodegit/path-spec.d.ts b/types/nodegit/path-spec.d.ts
index d09d2812da..99435d5e0d 100644
--- a/types/nodegit/path-spec.d.ts
+++ b/types/nodegit/path-spec.d.ts
@@ -6,7 +6,7 @@ import { Index } from './index';
 import { Strarray } from './str-array';
 
 export namespace Pathspec {
-    enum FLAG {
+    const enum FLAG {
         DEFAULT = 0,
         IGNORE_CASE = 1,
         USE_CASE = 2,
diff --git a/types/nodegit/rebase-operation.d.ts b/types/nodegit/rebase-operation.d.ts
index a6e6e53bfa..7144ebe6a9 100644
--- a/types/nodegit/rebase-operation.d.ts
+++ b/types/nodegit/rebase-operation.d.ts
@@ -1,7 +1,7 @@
 import { Oid } from './oid';
 
 export namespace RebaseOperation {
-    enum REBASE_OPERATION {
+    const enum REBASE_OPERATION {
         PICK = 0,
         REWORD = 1,
         EDIT = 2,
diff --git a/types/nodegit/reference.d.ts b/types/nodegit/reference.d.ts
index e2148f6a07..4edd34d2da 100644
--- a/types/nodegit/reference.d.ts
+++ b/types/nodegit/reference.d.ts
@@ -3,14 +3,14 @@ import { Oid } from './oid';
 import { Object } from './object';
 
 export namespace Reference {
-    enum TYPE {
+    const enum TYPE {
         INVALID = 0,
         OID = 1,
         SYMBOLIC = 2,
         LISTALL = 3
     }
 
-    enum NORMALIZE {
+    const enum NORMALIZE {
         REF_FORMAT_NORMAL = 0,
         REF_FORMAT_ALLOW_ONELEVEL = 1,
         REF_FORMAT_REFSPEC_PATTERN = 2,
diff --git a/types/nodegit/remote.d.ts b/types/nodegit/remote.d.ts
index 0c3923c57c..bba1f640fb 100644
--- a/types/nodegit/remote.d.ts
+++ b/types/nodegit/remote.d.ts
@@ -9,14 +9,14 @@ import { PushOptions } from './push-options';
 import { Refspec } from './ref-spec';
 
 export namespace Remote {
-    enum AUTOTAG_OPTION {
+    const enum AUTOTAG_OPTION {
         DOWNLOAD_TAGS_UNSPECIFIED = 0,
         DOWNLOAD_TAGS_AUTO = 1,
         DOWNLOAD_TAGS_NONE = 2,
         DOWNLOAD_TAGS_ALL = 3
     }
 
-    enum COMPLETION_TYPE {
+    const enum COMPLETION_TYPE {
         COMPLETION_DOWNLOAD = 0,
         COMPLETION_INDEXING = 1,
         COMPLETION_ERROR = 2
diff --git a/types/nodegit/reset.d.ts b/types/nodegit/reset.d.ts
index 8af3919ff4..25ff5ae563 100644
--- a/types/nodegit/reset.d.ts
+++ b/types/nodegit/reset.d.ts
@@ -5,7 +5,7 @@ import { Strarray } from './str-array';
 import { CheckoutOptions } from './checkout-options';
 
 export namespace Reset {
-    enum TYPE {
+    const enum TYPE {
         SOFT = 1,
         MIXED = 2,
         HARD = 3
diff --git a/types/nodegit/rev-parse.d.ts b/types/nodegit/rev-parse.d.ts
index 9d0136cac6..7bdbc80676 100644
--- a/types/nodegit/rev-parse.d.ts
+++ b/types/nodegit/rev-parse.d.ts
@@ -3,7 +3,7 @@ import { Repository } from './repository';
 import { Reference } from './reference';
 
 export namespace Revparse {
-    enum MODE {
+    const enum MODE {
         SINGLE = 1,
         RANGE = 2,
         MERGE_BASE = 4
diff --git a/types/nodegit/rev-walk.d.ts b/types/nodegit/rev-walk.d.ts
index ad54969164..643220b492 100644
--- a/types/nodegit/rev-walk.d.ts
+++ b/types/nodegit/rev-walk.d.ts
@@ -3,7 +3,7 @@ import { Oid } from './oid';
 import { Commit } from './commit';
 
 export namespace Revwalk {
-    enum SORT {
+    const enum SORT {
         NONE = 0,
         TOPOLOGICAL = 1,
         TIME = 2,
diff --git a/types/nodegit/stash.d.ts b/types/nodegit/stash.d.ts
index 5208fa7e5f..39a6893140 100644
--- a/types/nodegit/stash.d.ts
+++ b/types/nodegit/stash.d.ts
@@ -4,12 +4,12 @@ import { Oid } from './oid';
 import { CheckoutOptions } from './checkout-options';
 
 export namespace Stash {
-    enum APPLY_FLAGS {
+    const enum APPLY_FLAGS {
         APPLY_DEFAULT = 0,
         APPLY_REINSTATE_INDEX = 1
     }
 
-    enum APPLY_PROGRESS {
+    const enum APPLY_PROGRESS {
         NONE = 0,
         LOADING_STASH = 1,
         ANALYZE_INDEX = 2,
@@ -20,7 +20,7 @@ export namespace Stash {
         DONE = 7
     }
 
-    enum FLAGS {
+    const enum FLAGS {
         DEFAULT = 0,
         KEEP_INDEX = 1,
         INCLUDE_UNTRACKED = 2,
diff --git a/types/nodegit/status.d.ts b/types/nodegit/status.d.ts
index 92bbe564f3..49ad0fd142 100644
--- a/types/nodegit/status.d.ts
+++ b/types/nodegit/status.d.ts
@@ -4,7 +4,7 @@ import { StatusEntry } from './status-entry';
 import { StatusOptions } from './status-options';
 
 export namespace Status {
-    enum STATUS {
+    const enum STATUS {
         CURRENT = 0,
         INDEX_NEW = 1,
         INDEX_MODIFIED = 2,
@@ -21,7 +21,7 @@ export namespace Status {
         CONFLICTED = 32768
     }
 
-    enum OPT {
+    const enum OPT {
         INCLUDE_UNTRACKED = 1,
         INCLUDE_IGNORED = 2,
         INCLUDE_UNMODIFIED = 4,
@@ -40,7 +40,7 @@ export namespace Status {
         INCLUDE_UNREADABLE_AS_UNTRACKED = 32768
     }
 
-    enum SHOW {
+    const enum SHOW {
         INDEX_AND_WORKDIR = 0,
         INDEX_ONLY = 1,
         WORKDIR_ONLY = 2
diff --git a/types/nodegit/submodule.d.ts b/types/nodegit/submodule.d.ts
index b3c1576db4..fd64a1c8ac 100644
--- a/types/nodegit/submodule.d.ts
+++ b/types/nodegit/submodule.d.ts
@@ -4,7 +4,7 @@ import { Oid } from './oid';
 import { SubmoduleUpdateOptions } from './submodule-update-options';
 
 export namespace Submodule {
-    enum IGNORE {
+    const enum IGNORE {
         UNSPECIFIED = -1,
         NONE = 1,
         UNTRACKED = 2,
@@ -12,13 +12,13 @@ export namespace Submodule {
         ALL = 4
     }
 
-    enum RECURSE {
+    const enum RECURSE {
         NO = 0,
         YES = 1,
         ONDEMAND = 2
     }
 
-    enum STATUS {
+    const enum STATUS {
         IN_HEAD = 1,
         IN_INDEX = 2,
         IN_CONFIG = 4,
@@ -35,7 +35,7 @@ export namespace Submodule {
         WD_UNTRACKED = 8192
     }
 
-    enum UPDATE {
+    const enum UPDATE {
         CHECKOUT = 1,
         REBASE = 2,
         MERGE = 3,
diff --git a/types/nodegit/transport.d.ts b/types/nodegit/transport.d.ts
index 9d1a82b061..189985c469 100644
--- a/types/nodegit/transport.d.ts
+++ b/types/nodegit/transport.d.ts
@@ -2,7 +2,7 @@ import { Remote } from './remote';
 import { Strarray } from './str-array';
 
 export namespace Transport {
-    enum FLAGS {
+    const enum FLAGS {
         NONE = 0
     }
 }
diff --git a/types/nodegit/tree-entry.d.ts b/types/nodegit/tree-entry.d.ts
index 8d1b5d553e..844f5da90c 100644
--- a/types/nodegit/tree-entry.d.ts
+++ b/types/nodegit/tree-entry.d.ts
@@ -3,7 +3,7 @@ import { Oid } from './oid';
 import { Blob } from './blob';
 
 export namespace TreeEntry {
-    enum FILEMODE {
+    const enum FILEMODE {
         UNREADABLE = 0,
         TREE = 16384,
         BLOB = 33188,
diff --git a/types/nodegit/tree.d.ts b/types/nodegit/tree.d.ts
index b9ac62f9e2..c20037cb0a 100644
--- a/types/nodegit/tree.d.ts
+++ b/types/nodegit/tree.d.ts
@@ -6,7 +6,7 @@ import { Treebuilder } from './tree-builder';
 import { DiffFile } from './diff-file';
 
 export namespace Tree {
-    enum WALK_MODE {
+    const enum WALK_MODE {
         WALK_PRE = 0,
         WALK_POST = 1
     }