The Browserify/Stringify tool removes the Knockout Comment Binding functionality

As I work with Knockout and Browserify using Stringify, I am running into the issue of comments being stripped out by Stringify. These comments are important for my Knockout bindings to create a custom header within an iteration in a component. Is there a way to ignore comments in a file or specific types of comments in order to preserve the necessary Knockout functionality?

[1] - (Note 4)

Answer №1

When using Browserify, it is recommended to integrate Gulp into your workflow. For a more customized transformation with the Stringify plugin, you can define a personalized minifyOptions object. One interesting option to consider is ignoreCustomComments, which allows you to specify an array of regular expressions to prevent certain comments from being removed.

browserify({
    entries: 'index.js', extensions: ['.js'], watch: config.watching
  })
    .transform(babelify, {presets: ['es2015']})
    .transform(stringify, {
      appliesTo: {includeExtensions: ['.html']},
      minify: true,
      minifyOptions: {
        ignoreCustomComments: [/^(\s*ko)/, /^(\s*\/ko)/]
      }
    })

The regex pattern [/^(\s*ko)/, /^(\s*\/ko)/] will specifically preserve comments that begin with whitespace followed by 'ko' or '/ko' comment bindings. By setting the minifyOptions to a new object, the default settings are overridden and need to be redefined as necessary. More details on these configurations can be found here

Example Usage:

<!-- This comment will be removed -->

<!-- ko if: true -->
<h4>This content will be displayed</h4>
<!-- /ko -->

<!-- ko if: false -->
<h4>This content will NOT be displayed</h4>
<!-- /ko -->

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