diff --git a/tests/archive-compress.spec.js b/tests/archive-compress.spec.js
index 36afb34..b5b0654 100644
--- a/tests/archive-compress.spec.js
+++ b/tests/archive-compress.spec.js
@@ -22,19 +22,17 @@ describe('bitjs.archive.compress', () => {
   let inputFileInfos = new Map();
   let decompressedFileSize = 0;
 
-  before(() => {
-    for (const fileName of INPUT_FILENAMES) {
-      const fullFilename = `${PATH}${fileName}`;
-      const fd = fs.openSync(fullFilename, 'r');
-      const lastModTime = fs.fstatSync(fd).mtimeMs;
-      const nodeBuf = fs.readFileSync(fullFilename);
-      const fileData = new Uint8Array(
-          nodeBuf.buffer.slice(nodeBuf.byteOffset, nodeBuf.byteOffset + nodeBuf.length));
-      inputFileInfos.set(fileName, {fileName, lastModTime, fileData});
-      decompressedFileSize += fileData.byteLength;
-      fs.closeSync(fd);
-    }
-  });
+  for (const fileName of INPUT_FILENAMES) {
+    const fullFilename = `${PATH}${fileName}`;
+    const fd = fs.openSync(fullFilename, 'r');
+    const lastModTime = fs.fstatSync(fd).mtimeMs;
+    const nodeBuf = fs.readFileSync(fullFilename);
+    const fileData = new Uint8Array(
+        nodeBuf.buffer.slice(nodeBuf.byteOffset, nodeBuf.byteOffset + nodeBuf.length));
+    inputFileInfos.set(fileName, {fileName, lastModTime, fileData});
+    decompressedFileSize += fileData.byteLength;
+    fs.closeSync(fd);
+  }
 
   it('zipper throws for invalid compression method', async () => {
     expect(() => new Zipper({zipCompressionMethod: 42})).throws();
diff --git a/tests/archive-decompress.spec.js b/tests/archive-decompress.spec.js
index c0c38d5..f09045b 100644
--- a/tests/archive-decompress.spec.js
+++ b/tests/archive-decompress.spec.js
@@ -29,13 +29,11 @@ describe('bitjs.archive.decompress', () => {
   /** @type {Map<string, ArrayBuffer>} */
   let inputArrayBuffers = new Map();
 
-  before(() => {
-    for (const inputFile of INPUT_FILES) {
-      const nodeBuf = fs.readFileSync(`${PATH}${inputFile}`);
-      const ab = nodeBuf.buffer.slice(nodeBuf.byteOffset, nodeBuf.byteOffset + nodeBuf.length);
-      inputArrayBuffers.set(inputFile, ab);
-    }
-  });
+  for (const inputFile of INPUT_FILES) {
+    const nodeBuf = fs.readFileSync(`${PATH}${inputFile}`);
+    const ab = nodeBuf.buffer.slice(nodeBuf.byteOffset, nodeBuf.byteOffset + nodeBuf.length);
+    inputArrayBuffers.set(inputFile, ab);
+  }
 
   for (const outFile of ARCHIVE_FILES) {
     it(outFile, async () => {
@@ -71,7 +69,7 @@ describe('bitjs.archive.decompress', () => {
   }
 
   describe('gunzip', () => {
-    it('can unzip a file', async () => {
+    it('can gunzip a file', async () => {
       const bufs = new Map(inputArrayBuffers);
       const nodeBuf = fs.readFileSync(`${PATH}sample-1-slowest.txt.gz`);
       const ab = nodeBuf.buffer.slice(nodeBuf.byteOffset, nodeBuf.byteOffset + nodeBuf.length);
diff --git a/types/archive/decompress.d.ts b/types/archive/decompress.d.ts
index ebaa1c9..4059430 100644
--- a/types/archive/decompress.d.ts
+++ b/types/archive/decompress.d.ts
@@ -155,6 +155,25 @@ export class Untarrer extends Unarchiver {
      */
     constructor(ab: ArrayBuffer, options?: UnarchiverOptions);
 }
+/**
+ * IMPORTANT NOTES for Gunzipper:
+ * 1) A Gunzipper will only ever emit one EXTRACT event, because a gzipped file only ever contains
+ *    a single file.
+ * 2) If the gzipped file does not include the original filename as a FNAME block, then the
+ *    UnarchivedFile in the UnarchiveExtractEvent will not include a filename. It will be up to the
+ *    client to re-assemble the filename (if needed).
+ * 3) update() is not supported on a Gunzipper, since the current implementation relies on runtime
+ *    support for DecompressionStream('gzip') which can throw hard-to-detect errors reading only
+ *    only part of a file.
+ * 4) PROGRESS events are not yet supported in Gunzipper.
+ */
+export class Gunzipper extends Unarchiver {
+    /**
+     * @param {ArrayBuffer} ab
+     * @param {UnarchiverOptions} options
+     */
+    constructor(ab: ArrayBuffer, options?: UnarchiverOptions);
+}
 export type UnarchivedFile = {
     filename: string;
     fileData: Uint8Array;
diff --git a/types/archive/decompress.d.ts.map b/types/archive/decompress.d.ts.map
index ada8dff..6c2c8a8 100644
--- a/types/archive/decompress.d.ts.map
+++ b/types/archive/decompress.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"decompress.d.ts","sourceRoot":"","sources":["../../archive/decompress.js"],"names":[],"mappings":"AAmUA;;;;;;;;;;GAUG;AACH,kCARW,WAAW,YAGX,iBAAiB,GAAC,MAAM,GAGtB,UAAU,CAkBtB;AAhUD;;;;GAIG;AAEH;;;;GAIG;AAEH;;;GAGG;AAEH;;GAEG;AACH;IAgBE;;;;;;;OAOG;IACH,yBAPW,WAAW,YAGX,iBAAiB,GAAC,MAAM,EA0BlC;IA7CD;;;;;OAKG;IACH,cAAM;IAEN;;;;OAIG;IACH,sBAAc;IAoBZ;;;;OAIG;IACH,cAHU,WAAW,CAGA;IAErB;;;OAGG;IACH,YAFU,OAAO,CAEkB;IAGrC;;;;;OAKG;IACH,qCAJW,UAAU,GAAC,SAAS,GAAC,QAAQ,YAC7B,kCAAkC,QAK5C;IAED;;;;OAIG;IACH,2BAHoB,qBAAqB,WAC5B,UAAU,CAKtB;IAED;;;;OAIG;IACH,0BAHoB,oBAAoB,WAC3B,UAAU,CAKtB;IAED;;;;OAIG;IACH,4BAHoB,sBAAsB,WAC7B,UAAU,CAKtB;IAED;;;;OAIG;IACH,yBAHa,MAAM,CAKlB;IAED;;;;OAIG;IACH,+BAHa,MAAM,CAKlB;IAED;;;;;OAKG;IACH,8BAsBC;IAED;;;;;OAKG;IACH,yBAaC;IAED;;;;;OAKG;IACH,SAJa,QAAQ,IAAI,CAAC,CAgCzB;IAGD;;;;;;;;OAQG;IACH,WAPW,WAAW,qBAGX,OAAO,oBAgBjB;IAED;;OAEG;IACH,aAOC;CACF;AAID;IACE;;;OAGG;IACH,gBAHW,WAAW,YACX,iBAAiB,EAI3B;CAIF;AAED;IACE;;;OAGG;IACH,gBAHW,WAAW,YACX,iBAAiB,EAI3B;CAIF;AAED;IACE;;;OAGG;IACH,gBAHW,WAAW,YACX,iBAAiB,EAI3B;CAIF;;cAzRa,MAAM;cACN,UAAU;;;;;;YAKV,OAAO"}
\ No newline at end of file
+{"version":3,"file":"decompress.d.ts","sourceRoot":"","sources":["../../archive/decompress.js"],"names":[],"mappings":"AA4VA;;;;;;;;;;GAUG;AACH,kCARW,WAAW,YAGX,iBAAiB,GAAC,MAAM,GAGtB,UAAU,CAoBtB;AA3VD;;;;GAIG;AAEH;;;;GAIG;AAEH;;;GAGG;AAEH;;GAEG;AACH;IAgBE;;;;;;;OAOG;IACH,yBAPW,WAAW,YAGX,iBAAiB,GAAC,MAAM,EA0BlC;IA7CD;;;;;OAKG;IACH,cAAM;IAEN;;;;OAIG;IACH,sBAAc;IAoBZ;;;;OAIG;IACH,cAHU,WAAW,CAGA;IAErB;;;OAGG;IACH,YAFU,OAAO,CAEkB;IAGrC;;;;;OAKG;IACH,qCAJW,UAAU,GAAC,SAAS,GAAC,QAAQ,YAC7B,kCAAkC,QAK5C;IAED;;;;OAIG;IACH,2BAHoB,qBAAqB,WAC5B,UAAU,CAKtB;IAED;;;;OAIG;IACH,0BAHoB,oBAAoB,WAC3B,UAAU,CAKtB;IAED;;;;OAIG;IACH,4BAHoB,sBAAsB,WAC7B,UAAU,CAKtB;IAED;;;;OAIG;IACH,yBAHa,MAAM,CAKlB;IAED;;;;OAIG;IACH,+BAHa,MAAM,CAKlB;IAED;;;;;OAKG;IACH,8BAsBC;IAED;;;;;OAKG;IACH,yBAaC;IAED;;;;;OAKG;IACH,SAJa,QAAQ,IAAI,CAAC,CAgCzB;IAGD;;;;;;;;OAQG;IACH,WAPW,WAAW,qBAGX,OAAO,oBAgBjB;IAED;;OAEG;IACH,aAOC;CACF;AAID;IACE;;;OAGG;IACH,gBAHW,WAAW,YACX,iBAAiB,EAI3B;CAIF;AAED;IACE;;;OAGG;IACH,gBAHW,WAAW,YACX,iBAAiB,EAI3B;CAIF;AAED;IACE;;;OAGG;IACH,gBAHW,WAAW,YACX,iBAAiB,EAI3B;CAIF;AAED;;;;;;;;;;;GAWG;AACH;IACE;;;OAGG;IACH,gBAHW,WAAW,YACX,iBAAiB,EAI3B;CAIF;;cAlTa,MAAM;cACN,UAAU;;;;;;YAKV,OAAO"}
\ No newline at end of file
diff --git a/types/io/bitstream.d.ts b/types/io/bitstream.d.ts
index 7e77a0f..450228d 100644
--- a/types/io/bitstream.d.ts
+++ b/types/io/bitstream.d.ts
@@ -6,7 +6,7 @@
  *
  * Bit reading always proceeds from the first byte in the buffer, to the
  * second byte, and so on. The MTL flag controls which bit is considered
- * first *inside* the byte.
+ * first *inside* the byte. The default is least-to-most direction.
  *
  * An Example for how Most-To-Least vs Least-to-Most mode works:
  *
diff --git a/types/io/bytebuffer.d.ts b/types/io/bytebuffer.d.ts
index 6f8d580..c2952be 100644
--- a/types/io/bytebuffer.d.ts
+++ b/types/io/bytebuffer.d.ts
@@ -12,10 +12,16 @@ export class ByteBuffer {
      */
     public data: Uint8Array;
     /**
+     * Points to the byte that will next be written.
      * @type {number}
      * @public
      */
     public ptr: number;
+    /**
+     * Returns an exact copy of all the data that has been written to the ByteBuffer.
+     * @returns {Uint8Array}
+     */
+    getData(): Uint8Array;
     /**
      * @param {number} b The byte to insert.
      */
diff --git a/types/io/bytebuffer.d.ts.map b/types/io/bytebuffer.d.ts.map
index f9f7ef1..811c7fb 100644
--- a/types/io/bytebuffer.d.ts.map
+++ b/types/io/bytebuffer.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"bytebuffer.d.ts","sourceRoot":"","sources":["../../io/bytebuffer.js"],"names":[],"mappings":"AAaA;;GAEG;AACH;IACE;;OAEG;IACH,sBAFW,MAAM,EAkBhB;IAXC;;;OAGG;IACH,aAHU,UAAU,CAGgB;IAEpC;;;OAGG;IACH,YAHU,MAAM,CAGJ;IAId;;OAEG;IACH,cAFW,MAAM,QAKhB;IAED;;OAEG;IACH,mBAFW,MAAO,MAAM,CAAC,GAAC,UAAU,GAAC,SAAS,QAM7C;IAED;;;;;OAKG;IACH,iBAHW,MAAM,YACN,MAAM,QAuBhB;IAED;;;;;OAKG;IACH,uBAHW,MAAM,YACN,MAAM,QAqBhB;IAED;;OAEG;IACH,sBAFW,MAAM,QAUhB;CACF"}
\ No newline at end of file
+{"version":3,"file":"bytebuffer.d.ts","sourceRoot":"","sources":["../../io/bytebuffer.js"],"names":[],"mappings":"AAaA;;GAEG;AACH;IACE;;OAEG;IACH,sBAFW,MAAM,EAmBhB;IAZC;;;OAGG;IACH,aAHU,UAAU,CAGgB;IAEpC;;;;OAIG;IACH,YAHU,MAAM,CAGJ;IAGd;;;OAGG;IACH,WAFa,UAAU,CAMtB;IAED;;OAEG;IACH,cAFW,MAAM,QAShB;IAED;;OAEG;IACH,mBAFW,MAAO,MAAM,CAAC,GAAC,UAAU,GAAC,SAAS,QAU7C;IAED;;;;;OAKG;IACH,iBAHW,MAAM,YACN,MAAM,QAuBhB;IAED;;;;;OAKG;IACH,uBAHW,MAAM,YACN,MAAM,QAqBhB;IAED;;OAEG;IACH,sBAFW,MAAM,QAUhB;CACF"}
\ No newline at end of file
diff --git a/types/io/bytestream.d.ts b/types/io/bytestream.d.ts
index 188083b..cfcf1f2 100644
--- a/types/io/bytestream.d.ts
+++ b/types/io/bytestream.d.ts
@@ -42,15 +42,15 @@ export class ByteStream {
      * @private
      */
     private littleEndian_;
-    /** @returns {boolean} Whether the stream is little-endian. */
+    /** @returns {boolean} Whether the stream is little-endian (least significant byte is first). */
     isLittleEndian(): boolean;
     /**
-     * Big-Endian is sometimes called Motorola-style.
+     * Big-Endian means the most significant byte is first. it is sometimes called Motorola-style.
      * @param {boolean=} val The value to set. If not present, the stream is set to big-endian.
      */
     setBigEndian(val?: boolean | undefined): void;
     /**
-     * Little-Endian is sometimes called Intel-style.
+     * Little-Endian means the least significant byte is ifrst. is sometimes called Intel-style.
      * @param {boolean=} val The value to set. If not present, the stream is set to little-endian.
      */
     setLittleEndian(val?: boolean | undefined): void;
diff --git a/types/io/bytestream.d.ts.map b/types/io/bytestream.d.ts.map
index 3b4498f..509176c 100644
--- a/types/io/bytestream.d.ts.map
+++ b/types/io/bytestream.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"bytestream.d.ts","sourceRoot":"","sources":["../../io/bytestream.js"],"names":[],"mappings":"AAWA;;;;;;GAMG;AACH;IACE;;;;OAIG;IACH,gBAJW,WAAW,eACX,MAAM,2BACN,MAAM,cA4ChB;IAlCC;;;;OAIG;IACH,cAA+C;IAE/C;;;;OAIG;IACH,eAAgB;IAEhB;;;;OAIG;IACH,YAAY;IAEZ;;;;OAIG;IACH,mBAAmB;IAEnB;;;;OAIG;IACH,sBAAyB;IAG3B,8DAA8D;IAC9D,kBADc,OAAO,CAGpB;IAED;;;OAGG;IACH,mBAFW,OAAO,oBAIjB;IAED;;;OAGG;IACH,sBAFW,OAAO,oBAIjB;IAED;;;OAGG;IACH,mBAFa,MAAM,CAIlB;IAED;;;OAGG;IACH,mBAFa,MAAM,CAKlB;IAED;;;;;;OAMG;IACH,qBAOC;IAED;;;;;OAKG;IACH,cAHW,MAAM,GACJ,MAAM,CAmClB;IAGD;;;;;OAKG;IACH,cAHW,MAAM,GACJ,MAAM,CAMlB;IAGD;;;;;OAKG;IACH,oBAHW,MAAM,GACJ,MAAM,CAUlB;IAGD;;;;OAIG;IACH,oBAHW,MAAM,GACJ,MAAM,CAMlB;IAGD;;;;;;OAMG;IACH,aAJW,MAAM,gBACN,OAAO,GACL,UAAU,CAyCtB;IAED;;;;OAIG;IACH,aAHW,MAAM,GACJ,UAAU,CAItB;IAED;;;;OAIG;IACH,cAHW,MAAM,GACJ,MAAM,CA6BlB;IAED;;;;;OAKG;IACH,cAHW,MAAM,GACJ,MAAM,CAMlB;IAED;;;;OAIG;IACH,QAHW,MAAM,GACJ,UAAU,CAkBtB;IAED;;;OAGG;IACH,SAFW,WAAW,QAWrB;IAED;;;;;;;OAOG;IACH,OAFa,UAAU,CAUtB;CACF"}
\ No newline at end of file
+{"version":3,"file":"bytestream.d.ts","sourceRoot":"","sources":["../../io/bytestream.js"],"names":[],"mappings":"AAWA;;;;;;GAMG;AACH;IACE;;;;OAIG;IACH,gBAJW,WAAW,eACX,MAAM,2BACN,MAAM,cA4ChB;IAlCC;;;;OAIG;IACH,cAA+C;IAE/C;;;;OAIG;IACH,eAAgB;IAEhB;;;;OAIG;IACH,YAAY;IAEZ;;;;OAIG;IACH,mBAAmB;IAEnB;;;;OAIG;IACH,sBAAyB;IAG3B,gGAAgG;IAChG,kBADc,OAAO,CAGpB;IAED;;;OAGG;IACH,mBAFW,OAAO,oBAIjB;IAED;;;OAGG;IACH,sBAFW,OAAO,oBAIjB;IAED;;;OAGG;IACH,mBAFa,MAAM,CAIlB;IAED;;;OAGG;IACH,mBAFa,MAAM,CAKlB;IAED;;;;;;OAMG;IACH,qBAOC;IAED;;;;;OAKG;IACH,cAHW,MAAM,GACJ,MAAM,CAmClB;IAGD;;;;;OAKG;IACH,cAHW,MAAM,GACJ,MAAM,CAMlB;IAGD;;;;;OAKG;IACH,oBAHW,MAAM,GACJ,MAAM,CAUlB;IAGD;;;;OAIG;IACH,oBAHW,MAAM,GACJ,MAAM,CAMlB;IAGD;;;;;;OAMG;IACH,aAJW,MAAM,gBACN,OAAO,GACL,UAAU,CAyCtB;IAED;;;;OAIG;IACH,aAHW,MAAM,GACJ,UAAU,CAItB;IAED;;;;OAIG;IACH,cAHW,MAAM,GACJ,MAAM,CA6BlB;IAED;;;;;OAKG;IACH,cAHW,MAAM,GACJ,MAAM,CAMlB;IAED;;;;OAIG;IACH,QAHW,MAAM,GACJ,UAAU,CAkBtB;IAED;;;OAGG;IACH,SAFW,WAAW,QAWrB;IAED;;;;;;;OAOG;IACH,OAFa,UAAU,CAUtB;CACF"}
\ No newline at end of file