diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..4895b91
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,29 @@
+# This workflow will do a clean installation of node dependencies, cache/restore them, build the source code and run tests across different versions of node
+# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
+
+name: Node.js CI
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [14.x, 16.x, 18.x]
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v3
+      with:
+        node-version: ${{ matrix.node-version }}
+        cache: 'npm'
+    - run: npm ci
+    - run: npm test
diff --git a/index.js b/index.js
index 36e7e5d..4f1991f 100644
--- a/index.js
+++ b/index.js
@@ -2,16 +2,91 @@
 exports = module.exports = trim;
 
 function trim(str){
-  if (str.trim) return str.trim();
-  return str.replace(/^\s*|\s*$/g, '');
+  if (typeof str.trim === "function") {
+    return str.trim();
+  }
+
+  return trimLeft(trimRight(str));
 }
 
 exports.left = function(str){
-  if (str.trimLeft) return str.trimLeft();
-  return str.replace(/^\s*/, '');
+  if (typeof str.trimStart === "function") {
+    return str.trimStart();
+  }
+
+  return typeof str.trimLeft === "function" ? str.trimLeft() : trimLeft(str);
 };
 
 exports.right = function(str){
-  if (str.trimRight) return str.trimRight();
-  return str.replace(/\s*$/, '');
+  if (typeof str.trimEnd === "function") {
+    return str.trimEnd();
+  }
+
+  return typeof str.trimRight === "function" ? str.trimRight() : trimRight(str);
 };
+
+var getFirstNonSpaceIndex = function(str, isRightTrim) {
+  if (isEmpty(str)) {
+    return -1;
+  }
+
+  if (isRightTrim) {
+    var nonSpaceIndex = str.length - 1;
+    while (nonSpaceIndex > -1) {
+      if (isSpaceChar(str[nonSpaceIndex])) {
+        nonSpaceIndex--;
+        continue;
+      }
+
+      return nonSpaceIndex;
+    }
+  }
+
+  var nonSpaceIndex = 0;
+  var maxLength = str.length;
+  while (nonSpaceIndex < maxLength) {
+    if (isSpaceChar(str[nonSpaceIndex])) {
+      nonSpaceIndex++;
+      continue;
+    }
+
+    break;
+  }
+
+  return nonSpaceIndex >= maxLength ? -1 : nonSpaceIndex;
+}
+
+var isEmpty = function (str) {
+  return typeof str !== "string" || str.length === 0;
+}
+
+var isSpaceChar = function (char) {
+  return [" ", "\n", "\r"].indexOf(char) !== -1;
+}
+
+var trimLeft = function(str) {
+  if (isEmpty(str) || !isSpaceChar(str[0])) {
+    return str;
+  }
+
+  var nonSpaceIndex = getFirstNonSpaceIndex(str, false);
+  if (nonSpaceIndex < 0) {
+    return "";
+  }
+
+  return str.slice(nonSpaceIndex, str.length);
+}
+
+var trimRight = function(str) {
+  if (isEmpty(str) || !isSpaceChar(str[str.length - 1])) {
+    return str;
+  }
+
+  var nonSpaceIndex = getFirstNonSpaceIndex(str, true);
+  if (nonSpaceIndex < 0) {
+    return "";
+  }
+
+  var firstSpaceIndexFromTheEnd = nonSpaceIndex + 1;
+  return str.slice(0, firstSpaceIndexFromTheEnd);
+}
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..46f21f0
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1679 @@
+{
+  "name": "trim",
+  "version": "0.0.1",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "trim",
+      "version": "0.0.1",
+      "devDependencies": {
+        "mocha": "*",
+        "should": "*"
+      }
+    },
+    "node_modules/@ungap/promise-all-settled": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@ungap/promise-all-settled/-/promise-all-settled-1.1.2.tgz",
+      "integrity": "sha512-sL/cEvJWAnClXw0wHk85/2L0G6Sj8UB0Ctc1TEMbKSsmpRosqhwj9gWgFRZSrBr2f9tiXISwNhCPmlfqUqyb9Q==",
+      "dev": true
+    },
+    "node_modules/ansi-colors": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-4.1.1.tgz",
+      "integrity": "sha512-JoX0apGbHaUJBNl6yF+p6JAFYZ666/hhCGKN5t9QFjbJQKUU/g8MNbFDbvfrgKXvI1QpZplPOnwIo99lX/AAmA==",
+      "dev": true,
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/ansi-styles": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
+      "dev": true,
+      "dependencies": {
+        "color-convert": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/anymatch": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.2.tgz",
+      "integrity": "sha512-P43ePfOAIupkguHUycrc4qJ9kz8ZiuOUijaETwX7THt0Y/GNK7v0aa8rY816xWjZ7rJdA5XdMcpVFTKMq+RvWg==",
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+      },
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+      "dev": true
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+      "dev": true
+    },
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+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.2.0.tgz",
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+      "dev": true,
+      "dependencies": {
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+      }
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+      "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.2.tgz",
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+      "dev": true,
+      "dependencies": {
+        "fill-range": "^7.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/browser-stdout": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.1.tgz",
+      "integrity": "sha512-qhAVI1+Av2X7qelOfAIYwXONood6XlZE/fXaBSmW/T5SzLAmCgzi+eiWE7fUvbHaeNBQH13UftjpXxsfLkMpgw==",
+      "dev": true
+    },
+    "node_modules/camelcase": {
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+      "dev": true,
+      "engines": {
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+      },
+      "funding": {
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+      }
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+        "supports-color": "^7.1.0"
+      },
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+      },
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+          "type": "individual",
+          "url": "https://paulmillr.com/funding/"
+        }
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+      "dependencies": {
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+        "braces": "~3.0.2",
+        "glob-parent": "~5.1.2",
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+        "is-glob": "~4.0.1",
+        "normalize-path": "~3.0.0",
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+      "integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
+      "dev": true,
+      "requires": {
+        "is-number": "^7.0.0"
+      }
+    },
+    "workerpool": {
+      "version": "6.2.1",
+      "resolved": "https://registry.npmjs.org/workerpool/-/workerpool-6.2.1.tgz",
+      "integrity": "sha512-ILEIE97kDZvF9Wb9f6h5aXK4swSlKGUcOEGiIYb2OOu/IrDU9iwj0fD//SsA6E5ibwJxpEvhullJY4Sl4GcpAw==",
+      "dev": true
+    },
+    "wrap-ansi": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
+      "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==",
+      "dev": true,
+      "requires": {
+        "ansi-styles": "^4.0.0",
+        "string-width": "^4.1.0",
+        "strip-ansi": "^6.0.0"
+      }
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+      "dev": true
+    },
+    "y18n": {
+      "version": "5.0.8",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
+      "integrity": "sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==",
+      "dev": true
+    },
+    "yargs": {
+      "version": "16.2.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-16.2.0.tgz",
+      "integrity": "sha512-D1mvvtDG0L5ft/jGWkLpG1+m0eQxOfaBvTNELraWj22wSVUMWxZUvYgJYcKh6jGGIkJFhH4IZPQhR4TKpc8mBw==",
+      "dev": true,
+      "requires": {
+        "cliui": "^7.0.2",
+        "escalade": "^3.1.1",
+        "get-caller-file": "^2.0.5",
+        "require-directory": "^2.1.1",
+        "string-width": "^4.2.0",
+        "y18n": "^5.0.5",
+        "yargs-parser": "^20.2.2"
+      }
+    },
+    "yargs-parser": {
+      "version": "20.2.4",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.4.tgz",
+      "integrity": "sha512-WOkpgNhPTlE73h4VFAFsOnomJVaovO8VqLDzy5saChRBFQFBoMYirowyW+Q9HB4HFF4Z7VZTiG3iSzJJA29yRA==",
+      "dev": true
+    },
+    "yargs-unparser": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-2.0.0.tgz",
+      "integrity": "sha512-7pRTIA9Qc1caZ0bZ6RYRGbHJthJWuakf+WmHK0rVeLkNrrGhfoabBNdue6kdINI6r4if7ocq9aD/n7xwKOdzOA==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^6.0.0",
+        "decamelize": "^4.0.0",
+        "flat": "^5.0.2",
+        "is-plain-obj": "^2.1.0"
+      }
+    },
+    "yocto-queue": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
+      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
+      "dev": true
+    }
+  }
+}
diff --git a/package.json b/package.json
index bc003a2..b9f1306 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,9 @@
     "string",
     "trim"
   ],
+  "scripts": {
+    "test": "mocha --require should --reporter spec"
+  },
   "author": "TJ Holowaychuk <tj@vision-media.ca>",
   "dependencies": {},
   "devDependencies": {
diff --git a/test/trim.js b/test/trim.js
index fbe3358..6d751a2 100644
--- a/test/trim.js
+++ b/test/trim.js
@@ -5,17 +5,95 @@ describe('trim(str)', function(){
   it('should trim leading / trailing whitespace', function(){
     trim('  foo bar  ').should.equal('foo bar');
     trim('\n\n\nfoo bar\n\r\n\n').should.equal('foo bar');
-  })
-})
+    trim('\n\n\nfoo bar').should.equal('foo bar');
+    trim('foo bar\n\n\n').should.equal('foo bar');
+    trim('').should.equal('');
+    trim('      ').should.equal('');
+    trim('\n\n\n\n').should.equal('');
+    trim('\n\r\n\r').should.equal('');
+  });
+});
 
 describe('.left(str)', function(){
   it('should trim leading whitespace', function(){
     trim.left('  foo bar  ').should.equal('foo bar  ');
-  })
-})
+    trim.left('\n\n\nfoo bar\n\r\n\n').should.equal('foo bar\n\r\n\n');
+    trim.left('\n\n\nfoo bar').should.equal('foo bar');
+    trim.left('foo bar\n\n\n').should.equal('foo bar\n\n\n');
+    trim.left('').should.equal('');
+    trim.left('      ').should.equal('');
+    trim.left('\n\n\n\n').should.equal('');
+    trim.left('\n\r\n\r').should.equal('');
+  });
+});
 
 describe('.right(str)', function(){
   it('should trim trailing whitespace', function(){
     trim.right('  foo bar  ').should.equal('  foo bar');
+    trim.right('\n\n\nfoo bar\n\r\n\n').should.equal('\n\n\nfoo bar');
+    trim.right('\n\n\nfoo bar').should.equal('\n\n\nfoo bar');
+    trim.right('foo bar\n\n\n').should.equal('foo bar');
+    trim.right('').should.equal('');
+    trim.right('      ').should.equal('');
+    trim.right('\n\n\n\n').should.equal('');
+    trim.right('\n\r\n\r').should.equal('');
+  });
+});
+
+describe('trim string in old browser', function () {
+
+  var trimTemp = String.prototype.trim;
+  var trimLeftTemp = String.prototype.trimLeft;
+  var trimRigthTemp = String.prototype.trimRight;
+  var trimStartTemp = String.prototype.trimStart;
+  var trimEndTemp = String.prototype.trimEnd;
+
+  this.beforeEach(function() {
+    String.prototype.trim = undefined;
+    String.prototype.trimLeft = undefined;
+    String.prototype.trimRight = undefined;
+    String.prototype.trimStart = undefined;
+    String.prototype.trimEnd = undefined;
+  })
+
+  this.afterEach(function() {
+    String.prototype.trim = trimTemp;
+    String.prototype.trimLeft = trimLeftTemp;
+    String.prototype.trimRight = trimRigthTemp;
+    String.prototype.trimStart = trimStartTemp;
+    String.prototype.trimEnd = trimEndTemp;
   })
-})
+
+  it('should trim leading / trailing whitespace', function () {
+    trim('  foo bar  ').should.equal('foo bar');
+    trim('\n\n\nfoo bar\n\r\n\n').should.equal('foo bar');
+    trim('\n\n\nfoo bar').should.equal('foo bar');
+    trim('foo bar\n\n\n').should.equal('foo bar');
+    trim('').should.equal('');
+    trim('      ').should.equal('');
+    trim('\n\n\n\n').should.equal('');
+    trim('\n\r\n\r').should.equal('');
+  });
+
+  it('trim.right(str)', function () {
+    trim.right('  foo bar  ').should.equal('  foo bar');
+    trim.right('\n\n\nfoo bar\n\r\n\n').should.equal('\n\n\nfoo bar');
+    trim.right('\n\n\nfoo bar').should.equal('\n\n\nfoo bar');
+    trim.right('foo bar\n\n\n').should.equal('foo bar');
+    trim.right('').should.equal('');
+    trim.right('      ').should.equal('');
+    trim.right('\n\n\n\n').should.equal('');
+    trim.right('\n\r\n\r').should.equal('');
+  });
+
+  it('trim.left(str)', function () {
+    trim.left('  foo bar  ').should.equal('foo bar  ');
+    trim.left('\n\n\nfoo bar\n\r\n\n').should.equal('foo bar\n\r\n\n');
+    trim.left('\n\n\nfoo bar').should.equal('foo bar');
+    trim.left('foo bar\n\n\n').should.equal('foo bar\n\n\n');
+    trim.left('').should.equal('');
+    trim.left('      ').should.equal('');
+    trim.left('\n\n\n\n').should.equal('');
+    trim.left('\n\r\n\r').should.equal('');
+  });
+});
\ No newline at end of file