esutils

utility box for ECMAScript language tools

npm install esutils
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esutils (esutils) is utility box for ECMAScript language tools.

Functions

code.isDecimalDigit(code)

Return true if provided code is decimal digit.

code.isHexDigit(code)

Return true if provided code is hexadecimal digit.

code.isOctalDigit(code)

Return true if provided code is octal digit.

code.isWhiteSpace(code)

Return true if provided code is white space. White space characters are formally defined in ECMA262.

code.isLineTerminator(code)

Return true if provided code is line terminator. Line terminator characters are formally defined in ECMA262.

code.isIdentifierStart(code)

Return true if provided code can be the first character of ECMA262 Identifier. They are formally defined in ECMA262.

code.isIdentifierPart(code)

Return true if provided code can be the trailing character of ECMA262 Identifier. They are formally defined in ECMA262.

keyword

keyword.isKeywordES5(id, strict)

Return true if provided identifier string is one of Keywords in ECMA262 5.1. They are formally defined in ECMA262. If strict flag is true, this function additionally checks whether id is keyword under strict mode.

keyword.isKeywordES6(id, strict)

Return true if provided identifier string is one of Keywords in ECMA262 6. They are formally defined in ECMA262. If strict flag is true, this function additionally checks whether id is keyword under strict mode.

keyword.isRestrictedWord(id)

Return true if provided identifier string is one of restricted words under strict mode: "eval" or "arguments". They are formally defined in ECMA262.

keyword.isIdentifierName(id)

Return true if provided identifier string can be IdentifierName. They are formally defined in ECMA262.

License

Copyright (C) 2013 Yusuke Suzuki (twitter: @Constellation) and other contributors.

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 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.

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