* `ZSTD_c_compressionLevel`

* Set compression parameters according to pre-defined cLevel table. Default

level is ZSTD\_CLEVEL\_DEFAULT==3.

* `ZSTD_c_strategy`

* Select the compression strategy.

* Possible values are listed in the strategy options section below.

#### Strategy options

The following constants can be used as values for the `ZSTD_c_strategy`

parameter:

* `zlib.constants.ZSTD_fast`

* `zlib.constants.ZSTD_dfast`

* `zlib.constants.ZSTD_greedy`

* `zlib.constants.ZSTD_lazy`

* `zlib.constants.ZSTD_lazy2`

* `zlib.constants.ZSTD_btlazy2`

* `zlib.constants.ZSTD_btopt`

* `zlib.constants.ZSTD_btultra`

* `zlib.constants.ZSTD_btultra2`

Example:

```js

const stream = zlib.createZstdCompress({

params: {

[zlib.constants.ZSTD_c_strategy]: zlib.constants.ZSTD_btultra,

},

});

```

#### Pledged Source Size