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diff --git a/school/node_modules/esutils/lib/keyword.js b/school/node_modules/esutils/lib/keyword.js
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+/*
+  Copyright (C) 2013 Yusuke Suzuki <utatane.tea@gmail.com>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+(function () {
+    'use strict';
+
+    var code = require('./code');
+
+    function isStrictModeReservedWordES6(id) {
+        switch (id) {
+        case 'implements':
+        case 'interface':
+        case 'package':
+        case 'private':
+        case 'protected':
+        case 'public':
+        case 'static':
+        case 'let':
+            return true;
+        default:
+            return false;
+        }
+    }
+
+    function isKeywordES5(id, strict) {
+        // yield should not be treated as keyword under non-strict mode.
+        if (!strict && id === 'yield') {
+            return false;
+        }
+        return isKeywordES6(id, strict);
+    }
+
+    function isKeywordES6(id, strict) {
+        if (strict && isStrictModeReservedWordES6(id)) {
+            return true;
+        }
+
+        switch (id.length) {
+        case 2:
+            return (id === 'if') || (id === 'in') || (id === 'do');
+        case 3:
+            return (id === 'var') || (id === 'for') || (id === 'new') || (id === 'try');
+        case 4:
+            return (id === 'this') || (id === 'else') || (id === 'case') ||
+                (id === 'void') || (id === 'with') || (id === 'enum');
+        case 5:
+            return (id === 'while') || (id === 'break') || (id === 'catch') ||
+                (id === 'throw') || (id === 'const') || (id === 'yield') ||
+                (id === 'class') || (id === 'super');
+        case 6:
+            return (id === 'return') || (id === 'typeof') || (id === 'delete') ||
+                (id === 'switch') || (id === 'export') || (id === 'import');
+        case 7:
+            return (id === 'default') || (id === 'finally') || (id === 'extends');
+        case 8:
+            return (id === 'function') || (id === 'continue') || (id === 'debugger');
+        case 10:
+            return (id === 'instanceof');
+        default:
+            return false;
+        }
+    }
+
+    function isReservedWordES5(id, strict) {
+        return id === 'null' || id === 'true' || id === 'false' || isKeywordES5(id, strict);
+    }
+
+    function isReservedWordES6(id, strict) {
+        return id === 'null' || id === 'true' || id === 'false' || isKeywordES6(id, strict);
+    }
+
+    function isRestrictedWord(id) {
+        return id === 'eval' || id === 'arguments';
+    }
+
+    function isIdentifierNameES5(id) {
+        var i, iz, ch;
+
+        if (id.length === 0) { return false; }
+
+        ch = id.charCodeAt(0);
+        if (!code.isIdentifierStartES5(ch)) {
+            return false;
+        }
+
+        for (i = 1, iz = id.length; i < iz; ++i) {
+            ch = id.charCodeAt(i);
+            if (!code.isIdentifierPartES5(ch)) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    function decodeUtf16(lead, trail) {
+        return (lead - 0xD800) * 0x400 + (trail - 0xDC00) + 0x10000;
+    }
+
+    function isIdentifierNameES6(id) {
+        var i, iz, ch, lowCh, check;
+
+        if (id.length === 0) { return false; }
+
+        check = code.isIdentifierStartES6;
+        for (i = 0, iz = id.length; i < iz; ++i) {
+            ch = id.charCodeAt(i);
+            if (0xD800 <= ch && ch <= 0xDBFF) {
+                ++i;
+                if (i >= iz) { return false; }
+                lowCh = id.charCodeAt(i);
+                if (!(0xDC00 <= lowCh && lowCh <= 0xDFFF)) {
+                    return false;
+                }
+                ch = decodeUtf16(ch, lowCh);
+            }
+            if (!check(ch)) {
+                return false;
+            }
+            check = code.isIdentifierPartES6;
+        }
+        return true;
+    }
+
+    function isIdentifierES5(id, strict) {
+        return isIdentifierNameES5(id) && !isReservedWordES5(id, strict);
+    }
+
+    function isIdentifierES6(id, strict) {
+        return isIdentifierNameES6(id) && !isReservedWordES6(id, strict);
+    }
+
+    module.exports = {
+        isKeywordES5: isKeywordES5,
+        isKeywordES6: isKeywordES6,
+        isReservedWordES5: isReservedWordES5,
+        isReservedWordES6: isReservedWordES6,
+        isRestrictedWord: isRestrictedWord,
+        isIdentifierNameES5: isIdentifierNameES5,
+        isIdentifierNameES6: isIdentifierNameES6,
+        isIdentifierES5: isIdentifierES5,
+        isIdentifierES6: isIdentifierES6
+    };
+}());
+/* vim: set sw=4 ts=4 et tw=80 : */