esutils

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

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#### ast.isExpression(node)

Returns true if node is an Expression as defined in ECMA262 edition 5.1 section
11.

#### ast.isStatement(node)

Returns true if node is a Statement as defined in ECMA262 edition 5.1 section
12.

#### ast.isIterationStatement(node)

Returns true if node is an IterationStatement as defined in ECMA262 edition
5.1 section 12.6.

#### ast.isSourceElement(node)

Returns true if node is a SourceElement as defined in ECMA262 edition 5.1
section 14.

#### ast.trailingStatement(node)

Returns Statement? if node has trailing Statement.
``js
if (cond)
consequent;
`
When taking this IfStatement, returns consequent; statement.

#### ast.isProblematicIfStatement(node)

Returns true if node is a problematic IfStatement. If node is a problematic IfStatement, node cannot be represented as an one on one JavaScript code.
`js
{
type: 'IfStatement',
consequent: {
type: 'WithStatement',
body: {
type: 'IfStatement',
consequent: {type: 'EmptyStatement'}
}
},
alternate: {type: 'EmptyStatement'}
}
`
The above node cannot be represented as a JavaScript code, since the top level else alternate belongs to an inner IfStatement.




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#### 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.

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#### keyword.isKeywordES5(id, strict)

Returns true if provided identifier string is a Keyword or Future Reserved Word
in ECMA262 edition 5.1. They are formally defined in ECMA262 sections
7.6.1.1 and 7.6.1.2,
respectively. If the strict flag is truthy, this function additionally checks whether
id is a Keyword or Future Reserved Word under strict mode.

#### keyword.isKeywordES6(id, strict)

Returns true if provided identifier string is a Keyword or Future Reserved Word
in ECMA262 edition 6. They are formally defined in ECMA262 sections
11.6.2.1 and
11.6.2.2,
respectively. If the strict flag is truthy, this function additionally checks whether
id is a Keyword or Future Reserved Word under strict mode.

#### keyword.isReservedWordES5(id, strict)

Returns true if provided identifier string is a Reserved Word in ECMA262 edition 5.1.
They are formally defined in ECMA262 section 7.6.1.
If the strict flag is truthy, this function additionally checks whether id
is a Reserved Word under strict mode.

#### keyword.isReservedWordES6(id, strict)

Returns true if provided identifier string is a Reserved Word in ECMA262 edition 6.
They are formally defined in ECMA262 section 11.6.2.
If the strict flag is truthy, this function additionally checks whether id
is a Reserved Word under strict mode.

#### keyword.isRestrictedWord(id)

Returns true if provided identifier string is one of eval or arguments.
They are restricted in strict mode code throughout ECMA262 edition 5.1 and
in ECMA262 edition 6 section 12.1.1.

#### keyword.isIdentifierNameES5(id)

Return true if provided identifier string is an IdentifierName as specified in
ECMA262 edition 5.1 section 7.6.

#### keyword.isIdentifierNameES6(id)

Return true if provided identifier string is an IdentifierName as specified in
ECMA262 edition 6 section 11.6.

#### keyword.isIdentifierES5(id, strict)

Return true if provided identifier string is an Identifier as specified in
ECMA262 edition 5.1 section 7.6. If the strict
flag is truthy, this function additionally checks whether id is an Identifier
under strict mode.

#### keyword.isIdentifierES6(id, strict)

Return true if provided identifier string is an Identifier as specified in
ECMA262 edition 6 section 12.1.
If the strict flag is truthy, this function additionally checks whether id`
is an Identifier under strict mode.

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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.