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# Interface: AsyncZipOptions
Options for asynchronously creating a ZIP archive
## Hierarchy
* [AsyncDeflateOptions](asyncdeflateoptions.md)
* [ZipAttributes](zipattributes.md)
↳ **AsyncZipOptions**
## Index
### Properties
* [attrs](asynczipoptions.md#attrs)
* [comment](asynczipoptions.md#comment)
* [consume](asynczipoptions.md#consume)
* [extra](asynczipoptions.md#extra)
* [level](asynczipoptions.md#level)
* [mem](asynczipoptions.md#mem)
* [mtime](asynczipoptions.md#mtime)
* [os](asynczipoptions.md#os)
## Properties
### attrs
• `Optional` **attrs**: number
*Inherited from [ZipAttributes](zipattributes.md).[attrs](zipattributes.md#attrs)*
The file's attributes. These are traditionally somewhat complicated
and platform-dependent, so using them is scarcely necessary. However,
here is a representation of what this is, bit by bit:
`TTTTugtrwxrwxrwx0000000000ADVSHR`
TTTT = file type (rarely useful)
u = setuid, g = setgid, t = sticky
rwx = user permissions, rwx = group permissions, rwx = other permissions
0000000000 = unused
A = archive, D = directory, V = volume label, S = system file, H = hidden, R = read-only
If you want to set the Unix permissions, for instance, just bit shift by 16, e.g. 0644 << 16
___
### comment
• `Optional` **comment**: string
*Inherited from [ZipAttributes](zipattributes.md).[comment](zipattributes.md#comment)*
The comment to attach to the file. This field is defined by PKZIP's APPNOTE.txt,
section 4.4.26. The comment must be at most 65,535 bytes long UTF-8 encoded. This
field is not read by consumer software.
___
### consume
• `Optional` **consume**: boolean
*Inherited from [AsyncDeflateOptions](asyncdeflateoptions.md).[consume](asyncdeflateoptions.md#consume)*
Whether or not to "consume" the source data. This will make the typed array/buffer you pass in
unusable but will increase performance and reduce memory usage.
___
### extra
• `Optional` **extra**: Record\<number, Uint8Array>
*Inherited from [ZipAttributes](zipattributes.md).[extra](zipattributes.md#extra)*
Extra metadata to add to the file. This field is defined by PKZIP's APPNOTE.txt,
section 4.4.28. At most 65,535 bytes may be used in each ID. The ID must be an
integer between 0 and 65,535, inclusive.
This field is incredibly rare and almost never needed except for compliance with
proprietary standards and software.
___
### level
• `Optional` **level**: 0 \| 1 \| 2 \| 3 \| 4 \| 5 \| 6 \| 7 \| 8 \| 9
*Inherited from [DeflateOptions](deflateoptions.md).[level](deflateoptions.md#level)*
The level of compression to use, ranging from 0-9.
0 will store the data without compression.
1 is fastest but compresses the worst, 9 is slowest but compresses the best.
The default level is 6.
Typically, binary data benefits much more from higher values than text data.
In both cases, higher values usually take disproportionately longer than the reduction in final size that results.
For example, a 1 MB text file could:
- become 1.01 MB with level 0 in 1ms
- become 400 kB with level 1 in 10ms
- become 320 kB with level 9 in 100ms
___
### mem
• `Optional` **mem**: 0 \| 1 \| 2 \| 3 \| 4 \| 5 \| 6 \| 7 \| 8 \| 9 \| 10 \| 11 \| 12
*Inherited from [DeflateOptions](deflateoptions.md).[mem](deflateoptions.md#mem)*
The memory level to use, ranging from 0-12. Increasing this increases speed and compression ratio at the cost of memory.
Note that this is exponential: while level 0 uses 4 kB, level 4 uses 64 kB, level 8 uses 1 MB, and level 12 uses 16 MB.
It is recommended not to lower the value below 4, since that tends to hurt performance.
In addition, values above 8 tend to help very little on most data and can even hurt performance.
The default value is automatically determined based on the size of the input data.
___
### mtime
• `Optional` **mtime**: GzipOptions[\"mtime\"]
*Inherited from [ZipAttributes](zipattributes.md).[mtime](zipattributes.md#mtime)*
When the file was last modified. Defaults to the current time.
___
### os
• `Optional` **os**: number
*Inherited from [ZipAttributes](zipattributes.md).[os](zipattributes.md#os)*
The operating system of origin for this file. The value is defined
by PKZIP's APPNOTE.txt, section 4.4.2.2. For example, 0 (the default)
is MS/DOS, 3 is UNIX, 19 is macOS.
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