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35 lines
1.1 KiB
Markdown
35 lines
1.1 KiB
Markdown
7 years ago
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# constantinople
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Determine whether a JavaScript expression evaluates to a constant (using UglifyJS). Here it is assumed to be safe to underestimate how constant something is.
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[](https://travis-ci.org/ForbesLindesay/constantinople)
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[](https://gemnasium.com/ForbesLindesay/constantinople)
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[](http://badge.fury.io/js/constantinople)
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## Installation
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npm install constantinople
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## Usage
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```js
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var isConstant = require('constantinople')
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if (isConstant('"foo" + 5')) {
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console.dir(isConstant.toConstant('"foo" + 5'))
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}
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```
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## API
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### isConstant(src)
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Returns `true` if `src` evaluates to a constant, `false` otherwise. It will also return `false` if there is a syntax error, which makes it safe to use on potentially ES6 code.
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### toConstant(src)
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Returns the value resulting from evaluating `src`. This method throws an error if the expression is not constant. e.g. `toConstant("Math.random()")` would throw an error.
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## License
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MIT
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