KubeJS Scripting

KubeJS Scripting

MarieLib has full KubeJS support. You can read and modify player values, register custom values and profiles, and react to tracking events, all from .js scripts.

KubeJS must be installed. MarieLib's KubeJS integration loads automatically when both mods are present.

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📁 Script Locations

Script type	Folder
Reading/modifying player data, events	kubejs/server_scripts/
Registering values, profiles, milestones	kubejs/startup_scripts/

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📊 Reading Player Values

Use the MarieAPI binding in a server script.

// server_scripts/value_check.js

MarieEvents.valueChanged(event => {
    const level = MarieAPI.getValueLevel(event.player, "proteins")
    console.log(`${event.player.name}'s proteins: ${level}`)
})

MarieAPI.getValueLevel(player, valueKey)

Returns the player's current level for a value as a float between 0.0 and 1.0. Returns -1.0 if the value key doesn't exist.

const proteins = MarieAPI.getValueLevel(player, "proteins")
const grains   = MarieAPI.getValueLevel(player, "grains")

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✏️ Modifying Player Values

MarieAPI.setValueLevel(player, valueKey, value)

Directly sets a value to an exact level. Clamped to 0.0–1.0. Does not fire a modifier event.

MarieAPI.setValueLevel(player, "proteins", 0.5)

For gameplay mechanics that should respect other mods, prefer listening to valueModifier instead.

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📡 Server Events

All events run server-side. Subscribe in server_scripts/.

MarieEvents.valueChanged

Fires whenever any value changes.

MarieEvents.valueChanged(event => {
    // event.player     — the ServerPlayer
    // event.valueKey   — which value changed
    // event.oldValue   — previous value (0.0–1.0)
    // event.newValue   — new value (0.0–1.0)

    if (event.valueKey === "proteins" && event.newValue >= 0.9) {
        event.player.tell("Your protein intake is excellent!")
    }
})

MarieEvents.valueCritical

Fires once when a value crosses below its critical threshold.

MarieEvents.valueCritical(event => {
    event.player.tell(`Warning: your ${event.valueKey} is critically low!`)
})

MarieEvents.sourceApplied

Fires after a player applies a source item and gains value.

MarieEvents.sourceApplied(event => {
    // event.player    — the ServerPlayer
    // event.sourceId  — item ID string (e.g. "minecraft:carrot")
    // event.valueKey  — value gained
    // event.amount    — how much was gained

    console.log(`${event.player.name} applied ${event.sourceId} (+${event.amount} ${event.valueKey})`)
})

MarieEvents.valueModifier ⚡ Cancellable

Fires before a value gain is applied. Modify the amount or cancel it entirely.

MarieEvents.valueModifier(event => {
    // event.player    — the ServerPlayer
    // event.sourceId  — item ID string
    // event.valueKey  — value being applied
    // event.amount    — gain amount (read/write)
    // event.cancelled — set to true to block the gain

    if (event.valueKey === "vegetables") {
        event.amount *= 2
    }

    if (event.sourceId === "mymod:mystery_meat") {
        event.cancelled = true
    }
})

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🚀 Startup Registration

Registration happens in startup_scripts/. Event names use the consuming mod's id as prefix.

For Nourished, events are nourished.startup.register_values, nourished.startup.register_profiles, and nourished.startup.register_milestones. For a custom Marie mod, substitute your mod id.

Register a value

// startup_scripts/values.js

StartupEvents.registry('nourished.startup.register_values', event => {
    event.registerValue({
        id: "spices",
        displayName: "Spices",
        color: 0xFFE8A020,
        decayRate: 0.0005,
        low: 0.25,
        excess: 0.9
    })
})

Register a source classification

StartupEvents.registry('nourished.startup.register_values', event => {
    event.registerSourceClassification("mymod:spicy_pepper", "spices", 0.08)
})

Register a tracking profile

StartupEvents.registry('nourished.startup.register_profiles', event => {
    event.registerTrackingProfile({
        id: "hardcore",
        displayName: "Hardcore",
        decayRates: {
            proteins: 0.002,
            grains: 0.002
        },
        thresholds: {
            proteins: 0.4
        }
    })
})

Register a source pair synergy

StartupEvents.registry('nourished.startup.register_profiles', event => {
    event.registerSourcePairSynergy("minecraft:bread", "minecraft:cheese", 30, "dairy", 0.1)
})

Register a milestone

StartupEvents.registry('nourished.startup.register_milestones', event => {
    event.registerMilestone({
        id: "protein_master",
        valueKey: "proteins",
        target: 100.0,
        effectId: "minecraft:strength"
    })
})

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💡 Tips

• Use valueModifier for dynamic rules, anything you can check about a player can influence value gains.
• setValueLevel is direct and bypasses the modifier event. Good for admin tools or death penalties.
• Registration is startup-only. You cannot register new values from server scripts.

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📚 Related Pages

• API Reference
• Datapack Support
• Getting Started