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| ### esutils [](http://travis-ci.org/estools/esutils) | |
| esutils ([esutils](http://github.com/estools/esutils)) is | |
| utility box for ECMAScript language tools. | |
| ### API | |
| ### ast | |
| #### ast.isExpression(node) | |
| Returns true if `node` is an Expression as defined in ECMA262 edition 5.1 section | |
| [11](https://es5.github.io/#x11). | |
| #### ast.isStatement(node) | |
| Returns true if `node` is a Statement as defined in ECMA262 edition 5.1 section | |
| [12](https://es5.github.io/#x12). | |
| #### ast.isIterationStatement(node) | |
| Returns true if `node` is an IterationStatement as defined in ECMA262 edition | |
| 5.1 section [12.6](https://es5.github.io/#x12.6). | |
| #### ast.isSourceElement(node) | |
| Returns true if `node` is a SourceElement as defined in ECMA262 edition 5.1 | |
| section [14](https://es5.github.io/#x14). | |
| #### 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`. | |
| ### code | |
| #### 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) | |
| 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](http://es5.github.io/#x7.6.1.1) and [7.6.1.2](http://es5.github.io/#x7.6.1.2), | |
| 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](http://ecma-international.org/ecma-262/6.0/#sec-keywords) and | |
| [11.6.2.2](http://ecma-international.org/ecma-262/6.0/#sec-future-reserved-words), | |
| 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](http://es5.github.io/#x7.6.1). | |
| 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](http://ecma-international.org/ecma-262/6.0/#sec-reserved-words). | |
| 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](http://ecma-international.org/ecma-262/6.0/#sec-identifiers-static-semantics-early-errors). | |
| #### keyword.isIdentifierNameES5(id) | |
| Return true if provided identifier string is an IdentifierName as specified in | |
| ECMA262 edition 5.1 section [7.6](https://es5.github.io/#x7.6). | |
| #### keyword.isIdentifierNameES6(id) | |
| Return true if provided identifier string is an IdentifierName as specified in | |
| ECMA262 edition 6 section [11.6](http://ecma-international.org/ecma-262/6.0/#sec-names-and-keywords). | |
| #### keyword.isIdentifierES5(id, strict) | |
| Return true if provided identifier string is an Identifier as specified in | |
| ECMA262 edition 5.1 section [7.6](https://es5.github.io/#x7.6). 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](http://ecma-international.org/ecma-262/6.0/#sec-identifiers). | |
| If the `strict` flag is truthy, this function additionally checks whether `id` | |
| is an Identifier under strict mode. | |
| ### License | |
| Copyright (C) 2013 [Yusuke Suzuki](http://github.com/Constellation) | |
| (twitter: [@Constellation](http://twitter.com/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 <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. | |