diff --git a/.babelrc b/.babelrc
new file mode 100644
index 0000000..b0119fa
--- /dev/null
+++ b/.babelrc
@@ -0,0 +1,3 @@
+{
+    "plugins": ["transform-es2015-destructuring"]
+}
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
index 7ed46fc..6913e2f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,9 @@
 language: node_js
 node_js:
 - '6'
+- '4'
 script:
 - set -e
-- npm run lint
-- npm run lint-test
 - npm run test
 - npm run coveralls
 after_success:
diff --git a/build/printable-characters.js b/build/printable-characters.js
new file mode 100644
index 0000000..3c425d6
--- /dev/null
+++ b/build/printable-characters.js
@@ -0,0 +1,52 @@
+"use strict";
+
+var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();
+
+const ansiEscapeCode = '[\u001b\u009b][[()#;?]*(?:[0-9]{1,4}(?:;[0-9]{0,4})*)?[0-9A-PRZcf-nqry=><]',
+      zeroWidthCharacterExceptNewline = '\u0000-\u0008\u000B-\u0019\u001b\u009b\u00ad\u200b\u2028\u2029\ufeff',
+      zeroWidthCharacter = '\n' + zeroWidthCharacterExceptNewline,
+      zeroWidthCharactersExceptNewline = new RegExp('(?:' + ansiEscapeCode + ')|[' + zeroWidthCharacterExceptNewline + ']', 'g'),
+      zeroWidthCharacters = new RegExp('(?:' + ansiEscapeCode + ')|[' + zeroWidthCharacter + ']', 'g'),
+      partition = new RegExp('((?:' + ansiEscapeCode + ')|[\t' + zeroWidthCharacter + '])?([^\t' + zeroWidthCharacter + ']*)', 'g');
+
+module.exports = {
+
+    zeroWidthCharacters,
+
+    ansiEscapeCodes: new RegExp(ansiEscapeCode, 'g'),
+
+    strlen: s => s.replace(zeroWidthCharacters, '').length,
+
+    isBlank: s => s.replace(zeroWidthCharacters, '').replace(/\s/g, '').length === 0,
+
+    blank: s => s.replace(zeroWidthCharactersExceptNewline, '').replace(/[^\t\n]/g, ' '),
+
+    partition(s) {
+        for (var m, spans = []; partition.lastIndex !== s.length && (m = partition.exec(s));) {
+            spans.push([m[1] || '', m[2]]);
+        }
+        partition.lastIndex = 0; // reset
+        return spans;
+    },
+
+    first(s, n) {
+
+        let result = '',
+            length = 0;
+
+        for (const _ref of module.exports.partition(s)) {
+            var _ref2 = _slicedToArray(_ref, 2);
+
+            const nonPrintable = _ref2[0];
+            const printable = _ref2[1];
+
+            const text = printable.substr(0, n - length);
+            result += nonPrintable + text;
+            length += text.length;
+        }
+
+        return result;
+    }
+};
+
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..be2a1a2
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,5421 @@
+{
+  "name": "printable-characters",
+  "version": "1.0.27",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "abbrev": {
+      "version": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
+      "integrity": "sha1-kbR5JYinc4wl813W9jdSovh3YTU=",
+      "dev": true
+    },
+    "acorn": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.1.2.tgz",
+      "integrity": "sha512-o96FZLJBPY1lvTuJylGA9Bk3t/GKPPJG8H0ydQQl01crzwJgspa4AEIq/pVTXigmK0PHVQhiAtn8WMBLL9D2WA==",
+      "dev": true
+    },
+    "acorn-jsx": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
+      "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
+      "dev": true,
+      "requires": {
+        "acorn": "3.3.0"
+      },
+      "dependencies": {
+        "acorn": {
+          "version": "3.3.0",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
+          "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
+          "dev": true
+        }
+      }
+    },
+    "ajv": {
+      "version": "5.2.3",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.2.3.tgz",
+      "integrity": "sha1-wG9Zh3jETGsWGrr+NGa4GtGBTtI=",
+      "dev": true,
+      "requires": {
+        "co": "4.6.0",
+        "fast-deep-equal": "1.0.0",
+        "json-schema-traverse": "0.3.1",
+        "json-stable-stringify": "1.0.1"
+      }
+    },
+    "ajv-keywords": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-2.1.0.tgz",
+      "integrity": "sha1-opbhf3v658HOT34N5T0pyzIWLfA=",
+      "dev": true
+    },
+    "align-text": {
+      "version": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
+      "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
+      "dev": true,
+      "requires": {
+        "kind-of": "https://registry.npmjs.org/kind-of/-/kind-of-3.2.2.tgz",
+        "longest": "https://registry.npmjs.org/longest/-/longest-1.0.1.tgz",
+        "repeat-string": "https://registry.npmjs.org/repeat-string/-/repeat-string-1.6.1.tgz"
+      }
+    },
+    "amdefine": {
+      "version": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
+      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
+      "dev": true
+    },
+    "ansi-escapes": {
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+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.0.0.tgz",
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+      "dev": true
+    },
+    "ansi-regex": {
+      "version": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.0.0.tgz",
+      "integrity": "sha1-xQYbbg74qBd15Q9dZhUb9r83EQc=",
+      "dev": true
+    },
+    "ansi-styles": {
+      "version": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
+      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+      "dev": true
+    },
+    "anymatch": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-1.3.2.tgz",
+      "integrity": "sha512-0XNayC8lTHQ2OI8aljNCN3sSx6hsr/1+rlcDAotXJR7C1oZZHCNsfpbKwMjRA3Uqb5tF1Rae2oloTr4xpq+WjA==",
+      "dev": true,
+      "optional": true,
+      "requires": {
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+        "normalize-path": "2.1.1"
+      }
+    },
+    "argparse": {
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+      "integrity": "sha1-c9g7wmP4bpf4zE9rrhsOkKfSLIY=",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz"
+      }
+    },
+    "arr-diff": {
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+      "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-2.0.0.tgz",
+      "integrity": "sha1-jzuCf5Vai9ZpaX5KQlasPOrjVs8=",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "arr-flatten": "1.1.0"
+      }
+    },
+    "arr-flatten": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.1.0.tgz",
+      "integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg==",
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+      "optional": true
+    },
+    "array-union": {
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+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz",
+      "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
+      "dev": true,
+      "requires": {
+        "array-uniq": "1.0.3"
+      }
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+    "array-uniq": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz",
+      "integrity": "sha1-r2rId6Jcx/dOBYiUdThY39sk/bY=",
+      "dev": true
+    },
+    "array-unique": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.2.1.tgz",
+      "integrity": "sha1-odl8yvy8JiXMcPrc6zalDFiwGlM=",
+      "dev": true,
+      "optional": true
+    },
+    "arrify": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/arrify/-/arrify-1.0.1.tgz",
+      "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
+      "dev": true
+    },
+    "asn1": {
+      "version": "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz",
+      "integrity": "sha1-2sh4dxPJlmhJ/IGAd36+nB3fO4Y=",
+      "dev": true
+    },
+    "assert-plus": {
+      "version": "https://registry.npmjs.org/assert-plus/-/assert-plus-0.2.0.tgz",
+      "integrity": "sha1-104bh+ev/A24qttwIfP+SBAasjQ=",
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+      "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
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+    },
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+      "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.1.tgz",
+      "integrity": "sha1-GdOGodntxufByF04iu28xW0zYC0=",
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+      "optional": true
+    },
+    "asynckit": {
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+    },
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+        "decamelize": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
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+}
diff --git a/package.json b/package.json
index 9ec23bc..89142f5 100644
--- a/package.json
+++ b/package.json
@@ -4,10 +4,12 @@
   "description": "A little helper for handling strings containing zero width control characters, ANSI styling, whitespaces, newlines, etc.",
   "main": "printable-characters.js",
   "scripts": {
-    "test": "nyc --reporter=html --reporter=text mocha --reporter spec",
-    "autotest": "mocha --reporter spec --watch",
     "lint": "eslint printable-characters.js",
     "lint-test": "eslint printable-characters.js",
+    "babel": "babel printable-characters.js --source-maps inline --out-file ./build/printable-characters.js",
+    "build": "npm run lint && npm run lint-test && npm run babel",
+    "test": "npm run build && nyc --reporter=html --reporter=text mocha --reporter spec",
+    "autotest": "mocha --reporter spec --watch",
     "coveralls": "nyc report --reporter=text-lcov | coveralls"
   },
   "repository": {
@@ -58,10 +60,12 @@
   "license": "Unlicense",
   "homepage": "https://github.com/xpl/printable-characters",
   "devDependencies": {
+    "babel-cli": "^6.26.0",
+    "babel-plugin-transform-es2015-destructuring": "^6.23.0",
     "coveralls": "^2.13.1",
-    "eslint": "^4.2.0",
+    "eslint": "^4.7.2",
     "istanbul": "^0.4.5",
-    "mocha": "^3.4.2",
-    "nyc": "^11.0.3"
+    "mocha": "^3.5.3",
+    "nyc": "^11.2.1"
   }
 }
diff --git a/test.js b/test.js
index 9b4120a..d5566db 100644
--- a/test.js
+++ b/test.js
@@ -1,27 +1,31 @@
-const assert = require ('assert')
+const assert              = require ('assert')
+const printableCharacters = require ('./build/printable-characters')
+
+// cannot use spread operator in tests due to Node v4 compatibility requirements...
+const strlen              = printableCharacters.strlen
+    , isBlank             = printableCharacters.isBlank
+    , blank               = printableCharacters.blank
+    , ansiEscapeCodes     = printableCharacters.ansiEscapeCodes
+    , zeroWidthCharacters = printableCharacters.zeroWidthCharacters
+    , partition           = printableCharacters.partition
+    , first               = printableCharacters.first
 
 describe ('printable-characters', () => {
 
     it ('determines visible length', () => {
 
-        const { strlen } = require ('./printable-characters')
-
         assert (strlen ('foo bar'), 7)
         assert (strlen ('\u001b[106mfoo bar\u001b[49m'), 7)
     })
 
     it ('detects blank text', () => {
 
-        const { isBlank } = require ('./printable-characters')
-
         assert (!isBlank ('foobar'))
         assert ( isBlank ('\u001b[106m  \t  \t   \n     \u001b[49m'))
     })
 
     it ('matches zero-width characters and ANSI escape codes', () => {
 
-        const { ansiEscapeCodes, zeroWidthCharacters } = require ('./printable-characters')
-
         let s = '\u001b[106m' + 'foo' + '\n\n' + 'bar' + '\u001b[49m'
 
         assert (s = s.replace (ansiEscapeCodes, ''), 'foo\n\nbar')
@@ -30,8 +34,6 @@ describe ('printable-characters', () => {
 
     it ('obtains blank string of the same width', () => {
 
-        const { blank } = require ('./printable-characters')
-
         assert.equal (blank ('foo'), '   ')
         assert.equal (blank ('\n'), '\n')
         assert.equal (blank ('\t'), '\t')
@@ -41,8 +43,6 @@ describe ('printable-characters', () => {
 
     it ('extracts invisible parts followed by visible ones', () => {
 
-        const { partition } = require ('./printable-characters')
-
         assert.deepEqual (partition (''),                        [                                                     ])
         assert.deepEqual (partition ('foo'),                     [['',          'foo']                                 ])
         assert.deepEqual (partition ('\u001b[1mfoo'),            [['\u001b[1m', 'foo']                                 ])
@@ -52,8 +52,6 @@ describe ('printable-characters', () => {
 
     it ('gets first N visible symbols (preserving invisible parts)', () => {
 
-        const { first } = require ('./printable-characters')
-
         assert.equal (first ('123456789', 0),   '')
         assert.equal (first ('123456789', 3),   '123')
         assert.equal (first ('123456789', 100), '123456789')