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add info about finding references in usemin task #619

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add info about finding references in usemin task #619

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d7b6597
add info about finding references in usemin task
ytxiuxiu Apr 3, 2016
2b1836e
change `url(` and `)` to `url(...)`
ytxiuxiu Apr 7, 2016
f348c3b
add a example to make it easy to be understanded
ytxiuxiu Apr 7, 2016
3b2d49b
clean up some confusion
ytxiuxiu Apr 8, 2016
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6 changes: 6 additions & 0 deletions README.md
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Expand Up @@ -346,6 +346,12 @@ The `usemin` task has 2 actions:
* First it replaces all the blocks with a single "summary" line, pointing to a file creating by the transformation flow.
* Then it looks for references to assets (i.e. images, scripts, ...), and tries to replace them with their revved version if it can find one on disk

### Finding references

`usemin` will look for different kinds of references in files of certain types. The type of the file should be indicated by using target name. That is to say, the target name in the `usemin` task should only be in `html`, `css`, `json` and `svg` so that `usemin` can find possible types of references in these files.

For example, if the target name is `html`, `usemin` will find references of images, scripts, stylesheets, etc. However, `usemin` will only find references which are surrounded by `url(` and `)` when target name is `css`.
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I suggest we use url(...) instead of url( and ) as the placeholder.


### Finding assets

By default `usemin` will look for a map object created by [grunt-filerev](https://github.com/yeoman/grunt-filerev), located in `grunt.filerev.summary`. If it does not find it it will revert to disk lookup which is longer.
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