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constantinople
Advanced tools
Determine whether a JavaScript expression evaluates to a constant (using UglifyJS)
The 'constantinople' npm package is primarily used to determine if a JavaScript expression is a constant at compile time. This can be particularly useful in template engines, build tools, and other environments where compile-time evaluation can optimize runtime performance by reducing the need for unnecessary computations.
Compile-time constant evaluation
This feature allows developers to check if an expression is constant at compile time. The provided code checks if '2 + 2' is a constant expression.
const constantinople = require('constantinople');
if (constantinople.isConstant('2 + 2')) {
console.log('This is a constant expression.');
}
Like constantinople, jstransformer is used in template engines to transform inputs using a standardized interface. While constantinople focuses on compile-time constant checks, jstransformer provides a broader range of transformations but does not specifically optimize for compile-time constants.
uglify-js is a JavaScript parser, minifier, compressor, and beautifier toolkit. It shares some functionality with constantinople in terms of evaluating expressions during the build process to optimize scripts. However, uglify-js is more comprehensive in scope, focusing on overall code reduction and performance improvements.
Determine whether a JavaScript expression evaluates to a constant (using UglifyJS). Here it is assumed to be safe to underestimate how constant something is.
npm install constantinople
var isConstant = require('constantinople')
if (isConstant('"foo" + 5')) {
console.dir(isConstant.toConstant('"foo" + 5'))
}
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.
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.
MIT
FAQs
Determine whether a JavaScript expression evaluates to a constant
The npm package constantinople receives a total of 1,261,926 weekly downloads. As such, constantinople popularity was classified as popular.
We found that constantinople demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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