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https://github.com/jrit/web-resource-inliner

Inlines img, script and link tags into the same file
https://github.com/jrit/web-resource-inliner

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Inlines img, script and link tags into the same file

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# web-resource-inliner [![build status](https://api.travis-ci.org/jrit/web-resource-inliner.svg)](http://travis-ci.org/jrit/web-resource-inliner)



Brings externally referenced resources, such as js, css and images, into a single file.



For example:



```html



```

is replaced with

```html



/* contents of css/style.css */



```



Javascript references are brought inline, and images in the html and css blocks are converted to base-64 data: urls.



By default, all links and scripts are inlined, plus any images under 8KB, however this behavior can be overrided via several options.



## Getting Started

```

npm install web-resource-inliner

```



## Usage Examples



For a number of usage examples, see ./test/spec.js and the associated test.* and test_out.* files in ./test/cases/



## Methods



#### html( options, callback )

Expects options.fileContent to be HTML and creates a new HTML document. `callback` will be called on completion or error with arguments `( error, result )`.



#### css( options, callback )

Expects options.fileContent to be CSS and creates a new CSS document. `callback` will be called on completion or error with arguments `( error, result )`.



## Options



#### `fileContent`, required

This is the HTML or CSS content to be inlined, you should provide HTML to the `html()` method and CSS to the `css()` method or you will get errors or garbage output.



#### `inlineAttribute`, string, default `data-inline`

Sets the attribute that is used to include/exclude specific resources based on the default behavior for the resource type. For example, if `scripts` is set to `false`, an individual script can be inlined by adding the attribute to the `script` tag like ``. On the other hand, if `images` are set to be inlined by default, a specific image can be excluded by adding `-ignore` to the end of the `inlineAttribute` like ``. In CSS, a comment is required at the end of the line to perform the same thing, such as `/*data-inline*/` or `/*data-inline-ignore*/`.



#### `images`, Boolean or Number, default `8`

When true, inline images unless they have an exclusion attribute (see inlineAttribute option). When false, exclude images unless they have an inclusion attribute (see inlineAttribute option). When a number, inline images only when the base64 content size is less than the number of KBs. For example, the default is to only inline images less than 8KB.



#### `svgs`, Boolean or Number, default `8`

When true, inline SVG `` unless they have an exclusion attribute (see inlineAttribute option). When false, exclude SVG `` unless they have an inclusion attribute (see inlineAttribute option). When a number, inline SVG `` only when the content size is less than the number of KBs. For example, the default is to only inline SVGs less than 8KB.



#### `scripts`, Boolean or Number, default `true`

When true, inline scripts unless they have an exclusion attribute (see inlineAttribute option). When false, exclude scripts unless they have an inclusion attribute (see inlineAttribute option). When a number, inline scripts only when the base64 content size is less than the number of KBs.



#### `links`, Boolean or Number, default `true`

When true, inline stylesheet links unless they have an exclusion attribute (see inlineAttribute option). When false, exclude stylesheet links unless they have an inclusion attribute (see inlineAttribute option). When a number, inline stylesheet links only when the base64 content size is less than the number of KBs.



#### `relativeTo`, string, default empty string

Describes the path relationship between where web-resource-inliner is running and what the relative paths in `fileContent` or href/src urls refer to. For example, the tests cases in this package are in `test/cases/` so their relative paths start by referring to that folder, but the root of this project and where `npm test` runs from is 2 folders up, so `relativeTo` is set to `test/cases/` in `test/spec.js`. Likewise, with `href="content.css"` and a `relativeTo` of `http://github.com/` the resource retrieved would be `http://github.com/content.css`.



#### `rebaseRelativeTo`, string, default empty string

Describes the path relationship between CSS content and the context it will be loaded in. For example, when a CSS file contains `url(some-file.png)` and the file is moved from a location in a folder like `/css` to `/` then the path to the image needs to be changed to `url(css/some-file.png)`. In this case, `rebaseRelativeTo` would be `css`. You probably don't want to set this when you are using `html()`.



#### `strict`, Boolean, default `false`

When strict is `true`, a missing resource will cause the inliner to halt and return an error in the callback. The default behavior is to log a warning to the console and continue inlining with the available resources, which is more similar to how a web page behaves.



#### `requestResource`, Function, default `undefined`

Allows to adjust issued requests. E.g., add authentication tokens to requested URLs. The function is called with `{ uri, encoding, gzip }` object as its parameter. It can replace builtin [node-fetch](https://github.com/node-fetch/node-fetch) with your own solution.



#### `scriptTransform`, Function( content, callback ), default `undefined`

Allows to make changes to scripts before they are inlined, such as minifying. Callback is standard node error first, second argument is transformed value.



#### `linkTransform`, Function( content, callback ), default `undefined`

Allows to make changes to links before they are inlined, such as CSS pre-and-post-processors. Callback is standard node error first, second argument is transformed value.



## Contributing

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Run tests with `npm test`.