unassertify

Browserify transform to remove assertions from code. Encourages Design by Contract (DbC).

RELATED MODULES

• unassert: Remove assertions from AST
• babel-plugin-unassert: Babel plugin to remove assertions on build
• webpack-unassert-loader: A webpack loader to remove assertions on production build

INSTALL

$ npm install --save-dev unassertify

HOW TO USE

via CLI

$ $(npm bin)/browserify -t unassertify /path/to/src/target.js > /path/to/build/target.js

via API

var source = require('vinyl-source-stream');
var browserify = require('browserify');
var glob = require('glob'),

gulp.task('production_build', function() {
    var files = glob.sync('./src/*.js');
    var b = browserify({entries: files});
    b.transform('unassertify');
    return b.bundle()
        .pipe(source('bundle.js'))
        .pipe(gulp.dest('./dist'));
});

EXAMPLE

For given math.js below,

'use strict';

var assert = require('assert');

function add (a, b) {
    console.assert(typeof a === 'number');
    assert(!isNaN(a));
    assert.equal(typeof b, 'number');
    assert.ok(!isNaN(b));
    return a + b;
}

Run browserify with -t unassertify to transform file.

$ $(npm bin)/browserify -t unassertify /path/to/demo/math.js > /path/to/build/math.js

You will see assert calls disappear.

'use strict';
function add(a, b) {
    return a + b;
}

AUTHOR

• Takuto Wada

LICENSE

Licensed under the MIT license.