92 lines
3 KiB
Markdown
92 lines
3 KiB
Markdown
# caniuse-lite
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A smaller version of caniuse-db, with only the essentials!
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## Why?
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The full data behind [Can I use][1] is incredibly useful for any front end
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developer, and on the website all of the details from the database are displayed
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to the user. However in automated tools, [many of these fields go unused][2];
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it's not a problem for server side consumption but client side, the less
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JavaScript that we send to the end user the better.
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caniuse-lite then, is a smaller dataset that keeps essential parts of the data
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in a compact format. It does this in multiple ways, such as converting `null`
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array entries into empty strings, representing support data as an integer rather
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than a string, and using base62 references instead of longer human-readable
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keys.
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This packed data is then reassembled (via functions exposed by this module) into
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a larger format which is mostly compatible with caniuse-db, and so it can be
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used as an almost drop-in replacement for caniuse-db for contexts where size on
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disk is important; for example, usage in web browsers. The API differences are
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very small and are detailed in the section below.
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## API
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```js
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import * as lite from 'caniuse-lite';
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```
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### `lite.agents`
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caniuse-db provides a full `data.json` file which contains all of the features
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data. Instead of this large file, caniuse-lite provides this data subset
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instead, which has the `browser`, `prefix`, `prefix_exceptions`, `usage_global`
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and `versions` keys from the original.
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In addition, the subset contains the `release_date` key with release dates (as timestamps) for each version:
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```json
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{
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"release_date": {
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"6": 998870400,
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"7": 1161129600,
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"8": 1237420800,
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"9": 1300060800,
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"10": 1346716800,
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"11": 1381968000,
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"5.5": 962323200
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}
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}
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```
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### `lite.feature(js)`
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The `feature` method takes a file from `data/features` and converts it into
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something that more closely represents the `caniuse-db` format. Note that only
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the `title`, `stats` and `status` keys are kept from the original data.
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### `lite.features`
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The `features` index is provided as a way to query all of the features that
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are listed in the `caniuse-db` dataset. Note that you will need to use the
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`feature` method on values from this index to get a human-readable format.
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### `lite.region(js)`
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The `region` method takes a file from `data/regions` and converts it into
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something that more closely represents the `caniuse-db` format. Note that *only*
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the usage data is exposed here (the `data` key in the original files).
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## License
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The data in this repo is available for use under a CC BY 4.0 license
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(http://creativecommons.org/licenses/by/4.0/). For attribution just mention
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somewhere that the source is caniuse.com. If you have any questions about using
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the data for your project please contact me here: http://a.deveria.com/contact
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[1]: http://caniuse.com/
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[2]: https://github.com/Fyrd/caniuse/issues/1827
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## Security contact information
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To report a security vulnerability, please use the
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[Tidelift security contact](https://tidelift.com/security).
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Tidelift will coordinate the fix and disclosure.
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