diff --git a/bin/cfb.njs b/bin/cfb.njs
deleted file mode 100755
index 862c818..0000000
--- a/bin/cfb.njs
+++ /dev/null
@@ -1,166 +0,0 @@
-#!/usr/bin/env node
-/* cfb.js (C) 2013-present  SheetJS -- http://sheetjs.com */
-/* eslint-env node */
-/* vim: set ts=2 ft=javascript: */
-var n = "cfb";
-var X = require('../');
-var fs = require('fs');
-var program = require('commander');
-var PRINTJ = require("printj");
-var sprintf = PRINTJ.sprintf;
-program
-	.version(X.version)
-	.usage('[options] <file> [subfiles...]')
-	.option('-l, --list-files', 'list files')
-	.option('-r, --repair', 'attempt to repair and garbage-collect archive')
-	.option('-c, --create', 'create file')
-	.option('-a, --append', 'add files to CFB (overwrite existing data)')
-	.option('-d, --delete', 'delete files from CFB')
-	.option('-O, --to-stdout', 'extract raw contents to stdout')
-	.option('-z, --dump', 'dump internal representation but do not extract')
-	.option('-q, --quiet', 'process but do not report')
-	.option('--here', 'skip the CFB root name when extracting')
-	.option('--osx', 'use OSX-style unzip listing')
-	.option('--zlib', 'use native zlib')
-	.option('--local', 'print times in local timezone')
-	.option('--dev', 'development mode')
-	.option('--read', 'read but do not print out contents');
-program.parse(process.argv);
-
-if(program.zlib) X.utils.use_zlib(require('zlib'));
-
-var exit = process.exit;
-var die = function(errno/*:number*/, msg/*:string*/) { console.error(n + ": " + msg); exit(errno); };
-var logit = function(cmd/*:string*/, f/*:string*/) { console.error(sprintf("%-6s %s", cmd, f)); };
-
-if(program.args.length === 0) die(1, "must specify a filename");
-
-if(program.create) {
-	logit("create", program.args[0]);
-	var newcfb = X.utils.cfb_new();
-	X.writeFile(newcfb, program.args[0]);
-}
-
-if(!fs.existsSync(program.args[0])) die(1, "must specify a filename");
-
-var opts = ({type:'file'}/*:any*/);
-if(program.dev) opts.WTF = true;
-
-var cfb = X.read(program.args[0], opts);
-if(program.quiet) exit(0);
-
-if(program.dump) {
-	console.log("Full Paths:");
-	console.log(cfb.FullPaths.map(function(x/*:string*/) { return "  " + x; }).join("\n"));
-	console.log("File Index:");
-	console.log(cfb.FileIndex);
-	exit(0);
-}
-if(program.repair) { X.writeFile(cfb, program.args[0]); exit(0); }
-
-var rlen = cfb.FullPaths[0].length;
-
-function fix_string(x/*:string*/)/*:string*/ { return x.replace(/[\u0000-\u001f]/g, function($$) { return sprintf("\\u%04X", $$.charCodeAt(0)); }); }
-var format_date = function(date/*:Date*/, osx/*:?any*/)/*:string*/ {
-	var datefmt = osx ? "%02u-%02u-%04u %02u:%02u": "%02u-%02u-%02u %02u:%02u";
-	var MM = program.local ? date.getMonth() + 1 : date.getUTCMonth() + 1;
-	var DD = program.local ? date.getDate() : date.getUTCDate();
-	var YY = (program.local ? date.getFullYear() : date.getUTCFullYear())%(osx ? 10000 : 100);
-	var hh = program.local ? date.getHours() : date.getUTCHours();
-	var mm = program.local ? date.getMinutes() : date.getUTCMinutes();
-	return sprintf(datefmt, MM, DD, YY, hh, mm);
-};
-
-if(program.listFiles) {
-	var basetime = new Date(Date.UTC(1980,0,1));
-	var cnt = 0, rootsize = 0, filesize = 0;
-	var fmtstr = "%9lu  %s   %s";
-	if(program.osx) {
-		console.log("Archive:  " + program.args[0]);
-		console.log("  Length      Date    Time    Name");
-		console.log("---------  ---------- -----   ----");
-		fmtstr = "%9lu  %s   %s";
-	} else {
-		console.log("  Length     Date   Time    Name");
-		console.log(" --------    ----   ----    ----");
-	}
-	cfb.FileIndex.forEach(function(file/*:CFBEntry*/, i/*:number*/) {
-		switch(file.type) {
-			case 5:
-				basetime = file.ct || file.mt || basetime;
-				rootsize = file.size;
-				break;
-			case 2:
-				var fixname = fix_string(cfb.FullPaths[i]);
-				if(program.osx && fixname.match(/\\u0001Sh33tJ5/)) return;
-				if(program.here) fixname = fixname.slice(rlen);
-				console.log(sprintf(fmtstr, file.size, format_date(file.mt || basetime, program.osx), fixname));
-				filesize += file.size;
-				++cnt;
-		}
-	});
-	var outfmt = "%9lu                   %lu file%s";
-	if(program.osx) {
-		console.log("---------                     -------");
-		outfmt = "%9lu                     %lu file%s";
-	} else {
-		console.log(" --------                   -------");
-	}
-	console.log(sprintf(outfmt, rootsize || filesize, cnt, (cnt !== 1 ? "s" : "")));
-
-	exit(0);
-}
-
-function mkdirp(path/*:string*/) { path.split("/").reduce(function(acc/*:string*/, p/*:string*/) {
-	acc += p + "/";
-	if(!fs.existsSync(acc)) { logit("mkdir", acc); fs.mkdirSync(acc); }
-	return acc;
-}, ""); }
-
-function write(path/*:string*/, data/*:CFBEntry*/) {
-	logit("write", fix_string(path));
-	fs.writeFileSync(path, /*::new Buffer((*/data.content/*:: :any))*/ || new Buffer(0));
-}
-
-if(program.create || program.append) {
-	program.args.slice(1).forEach(function(x/*:string*/) {
-		logit("append", x);
-		X.utils.cfb_add(cfb, "/" + x, fs.readFileSync(x));
-	});
-	X.writeFile(cfb, program.args[0]);
-	exit(0);
-}
-
-if(program.delete) {
-	program.args.slice(1).forEach(function(x/*:string*/) {
-		logit("delete", x);
-		X.utils.cfb_del(cfb, "/" + x);
-	});
-	X.writeFile(cfb, program.args[0]);
-	exit(0);
-}
-
-if(program.args.length > 1) {
-	program.args.slice(1).forEach(function(x/*:string*/) {
-		var data/*:?CFBEntry*/ = X.find(cfb, x.replace(/\\u000\d/g,"!"));
-		if(!data) { console.error(x + ": file not found"); return; }
-		if(data.type !== 2) { console.error(x + ": not a file"); return; }
-		var idx = cfb.FileIndex.indexOf(data), path = cfb.FullPaths[idx];
-		if(program.toStdout) return process.stdout.write(/*::new Buffer((*/data.content/*:: :any))*/);
-		mkdirp(path.slice(0, path.lastIndexOf("/")));
-		write(path, data);
-	});
-	exit(0);
-}
-
-if(program.toStdout) exit(0);
-for(var i=program.here ? 1 : 0; i!==cfb.FullPaths.length; ++i) {
-	if(!cfb.FileIndex[i].name) continue;
-	var fp = cfb.FullPaths[i];
-	if(program.here) fp = fp.slice(rlen);
-	if(fp.slice(-1) === "/") mkdirp(fp);
-	else {
-		if(fp.indexOf("/") > -1) mkdirp(fp.slice(0, fp.lastIndexOf("/")));
-		write(fp, cfb.FileIndex[i]);
-	}
-}
diff --git a/packages/cfb-cli/bin/cfb.njs b/packages/cfb-cli/bin/cfb.njs
new file mode 100755
index 0000000..7a99151
--- /dev/null
+++ b/packages/cfb-cli/bin/cfb.njs
@@ -0,0 +1,7 @@
+#!/usr/bin/env node
+/* cfb.js (C) 2013-present  SheetJS -- http://sheetjs.com */
+/* eslint-env node */
+/* vim: set ts=2 ft=javascript: */
+var cli = require('../');
+
+cli();
diff --git a/packages/cfb-cli/index.js b/packages/cfb-cli/index.js
new file mode 100644
index 0000000..a6398dd
--- /dev/null
+++ b/packages/cfb-cli/index.js
@@ -0,0 +1,173 @@
+#!/usr/bin/env node
+/* index.js (C) 2020-present  SheetJS -- http://sheetjs.com */
+/* eslint-env node */
+/* vim: set ts=2 ft=javascript: */
+
+var n = "cfb-cli";
+var X = require('cfb');
+var fs = require('fs');
+var program = require('commander');
+var PRINTJ = require("printj");
+function run() {
+  var sprintf = PRINTJ.sprintf;
+  program
+    .version(X.version)
+    .usage('[options] <file> [subfiles...]')
+    .option('-l, --list-files', 'list files')
+    .option('-r, --repair', 'attempt to repair and garbage-collect archive')
+    .option('-c, --create', 'create file')
+    .option('-a, --append', 'add files to CFB (overwrite existing data)')
+    .option('-d, --delete', 'delete files from CFB')
+    .option('-O, --to-stdout', 'extract raw contents to stdout')
+    .option('-z, --dump', 'dump internal representation but do not extract')
+    .option('-q, --quiet', 'process but do not report')
+    .option('--here', 'skip the CFB root name when extracting')
+    .option('--osx', 'use OSX-style unzip listing')
+    .option('--zlib', 'use native zlib')
+    .option('--local', 'print times in local timezone')
+    .option('--dev', 'development mode')
+    .option('--read', 'read but do not print out contents');
+  program.parse(process.argv);
+
+  if (program.zlib) X.utils.use_zlib(require('zlib'));
+
+  var exit = process.exit;
+  var die = function (errno/*:number*/, msg/*:string*/) { console.error(n + ": " + msg); exit(errno); };
+  var logit = function (cmd/*:string*/, f/*:string*/) { console.error(sprintf("%-6s %s", cmd, f)); };
+
+  if (program.args.length === 0) die(1, "must specify a filename");
+
+  if (program.create) {
+    logit("create", program.args[0]);
+    var newcfb = X.utils.cfb_new();
+    X.writeFile(newcfb, program.args[0]);
+  }
+
+  if (!fs.existsSync(program.args[0])) die(1, "must specify a filename");
+
+  var opts = ({ type: 'file' }/*:any*/);
+  if (program.dev) opts.WTF = true;
+
+  var cfb = X.read(program.args[0], opts);
+  if (program.quiet) exit(0);
+
+  if (program.dump) {
+    console.log("Full Paths:");
+    console.log(cfb.FullPaths.map(function (x/*:string*/) { return "  " + x; }).join("\n"));
+    console.log("File Index:");
+    console.log(cfb.FileIndex);
+    exit(0);
+  }
+  if (program.repair) { X.writeFile(cfb, program.args[0]); exit(0); }
+
+  var rlen = cfb.FullPaths[0].length;
+
+  function fix_string(x/*:string*/)/*:string*/ { return x.replace(/[\u0000-\u001f]/g, function ($$) { return sprintf("\\u%04X", $$.charCodeAt(0)); }); }
+  var format_date = function (date/*:Date*/, osx/*:?any*/)/*:string*/ {
+    var datefmt = osx ? "%02u-%02u-%04u %02u:%02u" : "%02u-%02u-%02u %02u:%02u";
+    var MM = program.local ? date.getMonth() + 1 : date.getUTCMonth() + 1;
+    var DD = program.local ? date.getDate() : date.getUTCDate();
+    var YY = (program.local ? date.getFullYear() : date.getUTCFullYear()) % (osx ? 10000 : 100);
+    var hh = program.local ? date.getHours() : date.getUTCHours();
+    var mm = program.local ? date.getMinutes() : date.getUTCMinutes();
+    return sprintf(datefmt, MM, DD, YY, hh, mm);
+  };
+
+  if (program.listFiles) {
+    var basetime = new Date(Date.UTC(1980, 0, 1));
+    var cnt = 0, rootsize = 0, filesize = 0;
+    var fmtstr = "%9lu  %s   %s";
+    if (program.osx) {
+      console.log("Archive:  " + program.args[0]);
+      console.log("  Length      Date    Time    Name");
+      console.log("---------  ---------- -----   ----");
+      fmtstr = "%9lu  %s   %s";
+    } else {
+      console.log("  Length     Date   Time    Name");
+      console.log(" --------    ----   ----    ----");
+    }
+    cfb.FileIndex.forEach(function (file/*:CFBEntry*/, i/*:number*/) {
+      switch (file.type) {
+        case 5:
+          basetime = file.ct || file.mt || basetime;
+          rootsize = file.size;
+          break;
+        case 2:
+          var fixname = fix_string(cfb.FullPaths[i]);
+          if (program.osx && fixname.match(/\\u0001Sh33tJ5/)) return;
+          if (program.here) fixname = fixname.slice(rlen);
+          console.log(sprintf(fmtstr, file.size, format_date(file.mt || basetime, program.osx), fixname));
+          filesize += file.size;
+          ++cnt;
+      }
+    });
+    var outfmt = "%9lu                   %lu file%s";
+    if (program.osx) {
+      console.log("---------                     -------");
+      outfmt = "%9lu                     %lu file%s";
+    } else {
+      console.log(" --------                   -------");
+    }
+    console.log(sprintf(outfmt, rootsize || filesize, cnt, (cnt !== 1 ? "s" : "")));
+
+    exit(0);
+  }
+
+  function mkdirp(path/*:string*/) {
+    path.split("/").reduce(function (acc/*:string*/, p/*:string*/) {
+      acc += p + "/";
+      if (!fs.existsSync(acc)) { logit("mkdir", acc); fs.mkdirSync(acc); }
+      return acc;
+    }, "");
+  }
+
+  function write(path/*:string*/, data/*:CFBEntry*/) {
+    logit("write", fix_string(path));
+    fs.writeFileSync(path, /*::new Buffer((*/data.content/*:: :any))*/ || new Buffer(0));
+  }
+
+  if (program.create || program.append) {
+    program.args.slice(1).forEach(function (x/*:string*/) {
+      logit("append", x);
+      X.utils.cfb_add(cfb, "/" + x, fs.readFileSync(x));
+    });
+    X.writeFile(cfb, program.args[0]);
+    exit(0);
+  }
+
+  if (program.delete) {
+    program.args.slice(1).forEach(function (x/*:string*/) {
+      logit("delete", x);
+      X.utils.cfb_del(cfb, "/" + x);
+    });
+    X.writeFile(cfb, program.args[0]);
+    exit(0);
+  }
+
+  if (program.args.length > 1) {
+    program.args.slice(1).forEach(function (x/*:string*/) {
+      var data/*:?CFBEntry*/ = X.find(cfb, x.replace(/\\u000\d/g, "!"));
+      if (!data) { console.error(x + ": file not found"); return; }
+      if (data.type !== 2) { console.error(x + ": not a file"); return; }
+      var idx = cfb.FileIndex.indexOf(data), path = cfb.FullPaths[idx];
+      if (program.toStdout) return process.stdout.write(/*::new Buffer((*/data.content/*:: :any))*/);
+      mkdirp(path.slice(0, path.lastIndexOf("/")));
+      write(path, data);
+    });
+    exit(0);
+  }
+
+  if (program.toStdout) exit(0);
+  for (var i = program.here ? 1 : 0; i !== cfb.FullPaths.length; ++i) {
+    if (!cfb.FileIndex[i].name) continue;
+    var fp = cfb.FullPaths[i];
+    if (program.here) fp = fp.slice(rlen);
+    if (fp.slice(-1) === "/") mkdirp(fp);
+    else {
+      if (fp.indexOf("/") > -1) mkdirp(fp.slice(0, fp.lastIndexOf("/")));
+      write(fp, cfb.FileIndex[i]);
+    }
+  }
+}
+
+module.exports = run;
\ No newline at end of file
diff --git a/packages/cfb-cli/package.json b/packages/cfb-cli/package.json
new file mode 100644
index 0000000..a5773ad
--- /dev/null
+++ b/packages/cfb-cli/package.json
@@ -0,0 +1,17 @@
+{
+  "name": "cfb-cli",
+  "version": "1.0.0",
+  "description": "Command-line interface for cfb",
+  "bin": {
+    "cfb-cli": "./bin/cfb.njs"
+  },
+  "main": "index.js",
+  "author": "Garrett Luu",
+  "license": "Apache-2.0",
+  "dependencies": {
+    "cfb": "^1.1.4",
+    "commander": "^5.1.0",
+    "fs": "0.0.1-security",
+    "printj": "^1.2.2"
+  }
+}