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1 | # minipass-sized
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2 |
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3 | A Minipass stream that raises an error if you get a different number of
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4 | bytes than expected.
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5 |
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6 | ## USAGE
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7 |
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8 | Use just like any old [minipass](http://npm.im/minipass) stream, but
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9 | provide a `size` option to the constructor.
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10 |
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11 | The `size` option must be a positive integer, smaller than
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12 | `Number.MAX_SAFE_INTEGER`.
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13 |
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14 | ```js
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15 | const MinipassSized = require('minipass-sized')
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16 | // figure out how much data you expect to get
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17 | const expectedSize = +headers['content-length']
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18 | const stream = new MinipassSized({ size: expectedSize })
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19 | stream.on('error', er => {
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20 | // if it's the wrong size, then this will raise an error with
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21 | // { found: <number>, expect: <number>, code: 'EBADSIZE' }
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22 | })
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23 | response.pipe(stream)
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24 | ```
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25 |
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26 | Caveats: this does not work with `objectMode` streams, and will throw a
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27 | `TypeError` from the constructor if the size argument is missing or
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28 | invalid.
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