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diff --git a/lexlua/javascript.lua b/lexlua/javascript.lua
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+++ b/lexlua/javascript.lua
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+-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
+-- JavaScript LPeg lexer.
+
+local lexer = require('lexer')
+local token, word_match = lexer.token, lexer.word_match
+local P, R, S = lpeg.P, lpeg.R, lpeg.S
+
+local lex = lexer.new('javascript')
+
+-- Whitespace.
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Keywords.
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
+  abstract boolean break byte case catch char class const continue debugger
+  default delete do double else enum export extends false final finally float
+  for function get goto if implements import in instanceof int interface let
+  long native new null of package private protected public return set short
+  static super switch synchronized this throw throws transient true try typeof
+  var void volatile while with yield
+]]))
+
+-- Identifiers.
+lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
+
+-- Comments.
+local line_comment = '//' * lexer.nonnewline_esc^0
+local block_comment = '/*' * (lexer.any - '*/')^0 * P('*/')^-1
+lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
+
+-- Strings.
+local regex_str = #P('/') * lexer.last_char_includes('+-*%^!=&|?:;,([{<>') *
+                  lexer.delimited_range('/', true) * S('igm')^0
+lex:add_rule('string', token(lexer.STRING, lexer.delimited_range("'") +
+                                           lexer.delimited_range('"') +
+                                           lexer.delimited_range('`')) +
+                       token(lexer.REGEX, regex_str))
+
+-- Numbers.
+lex:add_rule('number', token(lexer.NUMBER, lexer.float + lexer.integer))
+
+-- Operators.
+lex:add_rule('operator', token(lexer.OPERATOR, S('+-/*%^!=&|?:;,.()[]{}<>')))
+
+-- Fold points.
+lex:add_fold_point(lexer.OPERATOR, '{', '}')
+lex:add_fold_point(lexer.COMMENT, '/*', '*/')
+lex:add_fold_point(lexer.COMMENT, '//', lexer.fold_line_comments('//'))
+
+return lex