constantinople
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    4.0.1 • Public • Published

    constantinople

    Determine whether a JavaScript expression evaluates to a constant (using Babylon). Here it is assumed to be safe to underestimate how constant something is.

    Build Status Dependency Status NPM version

    Installation

    npm install constantinople
    

    Usage

    var isConstant = require('constantinople');
     
    if (isConstant('"foo" + 5')) {
      console.dir(isConstant.toConstant('"foo" + 5'));
    }
    if (isConstant('Math.floor(10.5)', {Math: Math})) {
      console.dir(isConstant.toConstant('Math.floor(10.5)', {Math: Math}));
    }

    API

    isConstant(src, [constants, [options]])

    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.

    Constants is an object mapping strings to values, where those values should be treated as constants. Note that this makes it a pretty bad idea to have Math in there if the user might make use of Math.random and a pretty bad idea to have Date in there.

    Options are directly passed-through to Babylon.

    toConstant(src, [constants, [options]])

    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.

    Constants is an object mapping strings to values, where those values should be treated as constants. Note that this makes it a pretty bad idea to have Math in there if the user might make use of Math.random and a pretty bad idea to have Date in there.

    Options are directly passed-through to Babylon.

    License

    MIT

    Install

    npm i constantinople

    DownloadsWeekly Downloads

    1,454,197

    Version

    4.0.1

    License

    MIT

    Unpacked Size

    35.6 kB

    Total Files

    15

    Last publish

    Collaborators

    • forbeslindesay
    • timothygu