CODEWITHSUNDEEP
javascripthtmlbuildwebpackwebpack-html-loader
wap300
wap300

Reputation: 2770

Use html-webpack-plugin with string-replace-loader in webpack

I'm trying to replace a variable in index.html that looks like this:

<meta name='author' content=$variable>

In the config file I use:

  {
    test: /index\.html$/,
    loader: 'string-replace',
    query: {
      search: '$variable',
      replace: 'stuff to inject',
    },
  }

In the loaders array, and then in plugins:

new HtmlWebpackPlugin({
  template: conf.path.src('src/index.html'),
  inject: true,
})

But this setting results in:

ERROR in ./~/html-webpack-plugin/lib/loader.js!./src/index.html Module parse failed (...) Unexpected token (1:0) You may need an appropriate loader to handle this file type.

Do you have any ideas what this can be caused by or how can I debug this?

Upvotes: 10

Views: 9881

Answers (3)

Stokesified
Stokesified

Reputation: 124

An update to @Jonathon Blok's answer, but for Webpack 4, with some slight modifications:

  • had to npm install --save-dev string-replace-loader@2.
  • had to use 'raw-loader' and 'string-replace-loader' identifiers because webpack@4 insisted.
  • used options: instead of query: as per the string-replace-loader docs.

For Webpack 4

{
  test: /.*\.html$/,
  loader: 'raw-loader',
},
{
  test: /.*\.html$/,
  loader: 'string-replace-loader',
  options: {
    multiple: [
      {search: '$variable1', replace: 'replacement 1'},
      {search: '$variable2', replace: 'replacement 2'}            ]
  }
}

As before,

The key change is to first run your html file through the raw loader, and then you can use all the normal config for the string-replace-loader.

For Webpack 5

Same as above should work for Webpack 5, though I haven't tested it, by omitting the @2 and installing string-loader with npm install --save-dev string-replace-loader. This is because v3 of the string-replace-loader is expected to work with Webpack 5+, as per the string-replace-loader docs.

Upvotes: 3

Jonathon Blok
Jonathon Blok

Reputation: 749

Konstantin's answer works fine and is good if you want to replace one value. I wanted to replace multiple values so added the following to my loaders array

  {
    test: /\.html$/,
    loader: 'raw'
  },
  {
    test: /\.html$/,
    loader: 'string-replace',
    query: {
      multiple: [
        {search: '$variable1', replace: 'replacement 1'},
        {search: '$variable2', replace: 'replacement 2'}
      ]
    }
  }

The key change is to first run your html file through the raw loader, and then you can use all the normal config for the string-replace-loader.

Upvotes: 3

Konstantin Kostin
Konstantin Kostin

Reputation: 61

It's caused because of string-replace-plugin expects a module that exporting a string. You should convert HTML file to CommonJS module.

For example, this is the way by using raw-loader:

first, add quotes to content attribute in html

<meta name='author' content='$variable'>`

and

{
    test: /index\.html$/,
    loader: 'string-replace?search=$variable&replace=stuff to inject!raw'
  }

Upvotes: 6

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