diff --git a/src/errors.js b/src/errors.ts
similarity index 66%
rename from src/errors.js
rename to src/errors.ts
index a0a37768a62..8a081aebe2a 100644
--- a/src/errors.js
+++ b/src/errors.ts
@@ -1,72 +1,72 @@
-export const ErrorTypes = {
+export enum ErrorTypes {
   // Identifier for a network error (loading error / timeout ...)
-  NETWORK_ERROR: 'networkError',
+  NETWORK_ERROR = 'networkError',
   // Identifier for a media Error (video/parsing/mediasource error)
-  MEDIA_ERROR: 'mediaError',
+  MEDIA_ERROR = 'mediaError',
   // EME (encrypted media extensions) errors
-  KEY_SYSTEM_ERROR: 'keySystemError',
+  KEY_SYSTEM_ERROR = 'keySystemError',
   // Identifier for a mux Error (demuxing/remuxing)
-  MUX_ERROR: 'muxError',
+  MUX_ERROR = 'muxError',
   // Identifier for all other errors
-  OTHER_ERROR: 'otherError'
-};
+  OTHER_ERROR = 'otherError'
+}
 
 /**
  * @enum {ErrorDetails}
  * @typedef {string} ErrorDetail
  */
-export const ErrorDetails = {
-  KEY_SYSTEM_NO_KEYS: 'keySystemNoKeys',
-  KEY_SYSTEM_NO_ACCESS: 'keySystemNoAccess',
-  KEY_SYSTEM_NO_SESSION: 'keySystemNoSession',
-  KEY_SYSTEM_LICENSE_REQUEST_FAILED: 'keySystemLicenseRequestFailed',
+export enum ErrorDetails {
+  KEY_SYSTEM_NO_KEYS = 'keySystemNoKeys',
+  KEY_SYSTEM_NO_ACCESS = 'keySystemNoAccess',
+  KEY_SYSTEM_NO_SESSION = 'keySystemNoSession',
+  KEY_SYSTEM_LICENSE_REQUEST_FAILED = 'keySystemLicenseRequestFailed',
   // Identifier for a manifest load error - data: { url : faulty URL, response : { code: error code, text: error text }}
-  MANIFEST_LOAD_ERROR: 'manifestLoadError',
+  MANIFEST_LOAD_ERROR = 'manifestLoadError',
   // Identifier for a manifest load timeout - data: { url : faulty URL, response : { code: error code, text: error text }}
-  MANIFEST_LOAD_TIMEOUT: 'manifestLoadTimeOut',
+  MANIFEST_LOAD_TIMEOUT = 'manifestLoadTimeOut',
   // Identifier for a manifest parsing error - data: { url : faulty URL, reason : error reason}
-  MANIFEST_PARSING_ERROR: 'manifestParsingError',
+  MANIFEST_PARSING_ERROR = 'manifestParsingError',
   // Identifier for a manifest with only incompatible codecs error - data: { url : faulty URL, reason : error reason}
-  MANIFEST_INCOMPATIBLE_CODECS_ERROR: 'manifestIncompatibleCodecsError',
+  MANIFEST_INCOMPATIBLE_CODECS_ERROR = 'manifestIncompatibleCodecsError',
   // Identifier for a level load error - data: { url : faulty URL, response : { code: error code, text: error text }}
-  LEVEL_LOAD_ERROR: 'levelLoadError',
+  LEVEL_LOAD_ERROR = 'levelLoadError',
   // Identifier for a level load timeout - data: { url : faulty URL, response : { code: error code, text: error text }}
-  LEVEL_LOAD_TIMEOUT: 'levelLoadTimeOut',
+  LEVEL_LOAD_TIMEOUT = 'levelLoadTimeOut',
   // Identifier for a level switch error - data: { level : faulty level Id, event : error description}
-  LEVEL_SWITCH_ERROR: 'levelSwitchError',
+  LEVEL_SWITCH_ERROR = 'levelSwitchError',
   // Identifier for an audio track load error - data: { url : faulty URL, response : { code: error code, text: error text }}
-  AUDIO_TRACK_LOAD_ERROR: 'audioTrackLoadError',
+  AUDIO_TRACK_LOAD_ERROR = 'audioTrackLoadError',
   // Identifier for an audio track load timeout - data: { url : faulty URL, response : { code: error code, text: error text }}
-  AUDIO_TRACK_LOAD_TIMEOUT: 'audioTrackLoadTimeOut',
+  AUDIO_TRACK_LOAD_TIMEOUT = 'audioTrackLoadTimeOut',
   // Identifier for fragment load error - data: { frag : fragment object, response : { code: error code, text: error text }}
-  FRAG_LOAD_ERROR: 'fragLoadError',
+  FRAG_LOAD_ERROR = 'fragLoadError',
   // Identifier for fragment load timeout error - data: { frag : fragment object}
-  FRAG_LOAD_TIMEOUT: 'fragLoadTimeOut',
+  FRAG_LOAD_TIMEOUT = 'fragLoadTimeOut',
   // Identifier for a fragment decryption error event - data: {id : demuxer Id,frag: fragment object, reason : parsing error description }
-  FRAG_DECRYPT_ERROR: 'fragDecryptError',
+  FRAG_DECRYPT_ERROR = 'fragDecryptError',
   // Identifier for a fragment parsing error event - data: { id : demuxer Id, reason : parsing error description }
   // will be renamed DEMUX_PARSING_ERROR and switched to MUX_ERROR in the next major release
-  FRAG_PARSING_ERROR: 'fragParsingError',
+  FRAG_PARSING_ERROR = 'fragParsingError',
   // Identifier for a remux alloc error event - data: { id : demuxer Id, frag : fragment object, bytes : nb of bytes on which allocation failed , reason : error text }
-  REMUX_ALLOC_ERROR: 'remuxAllocError',
+  REMUX_ALLOC_ERROR = 'remuxAllocError',
   // Identifier for decrypt key load error - data: { frag : fragment object, response : { code: error code, text: error text }}
-  KEY_LOAD_ERROR: 'keyLoadError',
+  KEY_LOAD_ERROR = 'keyLoadError',
   // Identifier for decrypt key load timeout error - data: { frag : fragment object}
-  KEY_LOAD_TIMEOUT: 'keyLoadTimeOut',
+  KEY_LOAD_TIMEOUT = 'keyLoadTimeOut',
   // Triggered when an exception occurs while adding a sourceBuffer to MediaSource - data : {  err : exception , mimeType : mimeType }
-  BUFFER_ADD_CODEC_ERROR: 'bufferAddCodecError',
+  BUFFER_ADD_CODEC_ERROR = 'bufferAddCodecError',
   // Identifier for a buffer append error - data: append error description
-  BUFFER_APPEND_ERROR: 'bufferAppendError',
+  BUFFER_APPEND_ERROR = 'bufferAppendError',
   // Identifier for a buffer appending error event - data: appending error description
-  BUFFER_APPENDING_ERROR: 'bufferAppendingError',
+  BUFFER_APPENDING_ERROR = 'bufferAppendingError',
   // Identifier for a buffer stalled error event
-  BUFFER_STALLED_ERROR: 'bufferStalledError',
+  BUFFER_STALLED_ERROR = 'bufferStalledError',
   // Identifier for a buffer full event
-  BUFFER_FULL_ERROR: 'bufferFullError',
+  BUFFER_FULL_ERROR = 'bufferFullError',
   // Identifier for a buffer seek over hole event
-  BUFFER_SEEK_OVER_HOLE: 'bufferSeekOverHole',
+  BUFFER_SEEK_OVER_HOLE = 'bufferSeekOverHole',
   // Identifier for a buffer nudge on stall (playback is stuck although currentTime is in a buffered area)
-  BUFFER_NUDGE_ON_STALL: 'bufferNudgeOnStall',
+  BUFFER_NUDGE_ON_STALL = 'bufferNudgeOnStall',
   // Identifier for an internal exception happening inside hls.js while handling an event
-  INTERNAL_EXCEPTION: 'internalException'
-};
+  INTERNAL_EXCEPTION = 'internalException'
+}