I want to make a client in fabric and I need this future inside the client

I don't support hacked clients. If you're not making a hacked client, then I can help. Every method and class in the API is documented, do you have any specific questions?

I need to add it as as a mod without the player to download it.

Just the API or the full mod? If your mod wants to use the API, then you can include the API without the mod.

I need the mod for now.

I would rather you downloaded the mod at runtime so it doesn't affect my download stats. The mod is published on my maven repository: https://bintray.com/earthcomputer/mods/multiconnect

And autodownload the last version so I don't have to change the verison when you relase a new version.

https://dl.bintray.com/earthcomputer/mods/net/earthcomputer/multiconnect/maven-metadata.xml

https://docs.gradle.org/current/userguide/dependency_verification.html

Please don't talk about hacked clients here.

Okay okay i was just wondering, he could make a mod instead of a hacked client...

@Earthcomputer Gradle can't find project.

@cristiioan please show the full error

• What went wrong:
  A problem occurred configuring root project 'LionClient'.

Could not resolve all dependencies for configuration ':modImplementation'.
Could not find net.earthcomputer.multiconnect:1.3.8:.
Searched in the following locations:
- file:/C:/Users/ioanm/Desktop/LionClient/build/loom-cache/1.3.8.jar
- file:/C:/Users/ioanm/Desktop/LionClient/.gradle/loom-cache/remapped_mods/1.3.8.jar
- file:/C:/Users/ioanm/.gradle/caches/fabric-loom/1.16.1-mapped-net.fabricmc.yarn-1.16.1+build.1-v2/1.3.8.jar
Required by:
project

`plugins {
id 'fabric-loom' version '0.4-SNAPSHOT'
id 'maven-publish'
}

sourceCompatibility = JavaVersion.VERSION_1_8
targetCompatibility = JavaVersion.VERSION_1_8

archivesBaseName = project.archives_base_name
version = project.mod_version
group = project.maven_group

minecraft {
}
repositories {
maven {
url 'https://dl.bintray.com/earthcomputer/mods'
}
}
dependencies {
//to change the versions see the gradle.properties file
minecraft "com.mojang:minecraft:${project.minecraft_version}"
mappings "net.fabricmc:yarn:${project.yarn_mappings}:v2"
modCompile "net.fabricmc:fabric-loader:${project.loader_version}"

// Fabric API. This is technically optional, but you probably want it anyway.
modCompile "net.fabricmc.fabric-api:fabric-api:${project.fabric_version}"
modRuntime 'net.earthcomputer:multiconnect:1.3.8'
modImplementation 'net.earthcomputer.multiconnect:1.3.8'
// net.wurstclient.ai.PathPos extends net.minecraft.util.math.BlockPos,
// which uses javax.annotation.concurrent.Immutable, which is part of
// the JSR305 library.
//
// In other words, Wurst won't compile without this library,
// even though it's Minecraft that actually uses it.
modCompile 'com.google.code.findbugs:jsr305:3.0.2'

// PSA: Some older mods, compiled on Loom 0.2.1, might have outdated Maven POMs.
// You may need to force-disable transitiveness on them.

}

processResources {
inputs.property "version", project.version

from(sourceSets.main.resources.srcDirs) {
	include "fabric.mod.json"
	expand "version": project.version
}

from(sourceSets.main.resources.srcDirs) {
	exclude "fabric.mod.json"
}

}

// ensure that the encoding is set to UTF-8, no matter what the system default is
// this fixes some edge cases with special characters not displaying correctly
// see http://yodaconditions.net/blog/fix-for-java-file-encoding-problems-with-gradle.html
tasks.withType(JavaCompile) {
options.encoding = "UTF-8"
}

// Loom will automatically attach sourcesJar to a RemapSourcesJar task and to the "build" task
// if it is present.
// If you remove this task, sources will not be generated.
task sourcesJar(type: Jar, dependsOn: classes) {
classifier = "sources"
from sourceSets.main.allSource
}

jar {
from "LICENSE"
}

// configure the maven publication
publishing {
publications {
mavenJava(MavenPublication) {
// add all the jars that should be included when publishing to maven
artifact(jar) {
builtBy remapJar
}
artifact(sourcesJar) {
builtBy remapSourcesJar
}
}
}

// select the repositories you want to publish to
repositories {
	// uncomment to publish to the local maven
	// mavenLocal()
}

}`

net.earthcomputer:multiconnect:1.3.8.

Learn maven.

Also don't develop hacked clients.