README.md



is-expression

Validates a string as a JavaScript expression


Installation

npm install is-expression


Usage


isExpression(src[, options])


Validates a string as a JavaScript expression.

src contains the source.

options can contain any Acorn options (since we use Acorn under-the-hood),
or any of the following:


throw: Throw an error if the string is not an expression. The error can
be an Acorn error, with location information in err.loc and err.pos.
Defaults to false.

strict: Use strict mode when trying to parse the string. Defaults to
false. Even if this option is false, if you have provided
options.sourceType === 'module' which imples strict mode under ES2015,
strict mode will be used.

lineComment: When true, allows line comments in the expression.
Defaults to false for safety.


See the examples below for usage.


Examples

var isExpression = require('is-expression')

isExpression('myVar')
//=> true
isExpression('var')
//=> false
isExpression('["an", "array", "\'s"].indexOf("index")')
//=> true

isExpression('var', {throw: true})
// SyntaxError: Unexpected token (1:0)
//     at Parser.pp.raise (acorn/dist/acorn.js:940:13)
//     at ...

isExpression('public')
//=> true
isExpression('public', {strict: true})
//=> false

isExpression('abc // my comment')
//=> false
isExpression('abc // my comment', {lineComment: true})
//=> true


License

MIT