Villager Trades

Disabling offers when start trading

/**
 * Disables the offers when the player starts trading.
 * In the example we will use a stage to disable the offers.
 */
// for 1.18 pls use: onEvent("morejs.player.start_trading")
MoreJSEvents.playerStartTrading((event) => {
    // We don't have the stage, so no trades for us :(
    if (!event.player.stages.has("allow_trading")) {
        event.forEachOffers((o, i) => {
            o.disabled = true;
        });
    }
});

/**
 * Another simple example to disable offers from the goblin trader mod.
 * `event.merchant` returns the trader entity.
 */
// for 1.18 pls use: onEvent("morejs.player.start_trading")
MoreJSEvents.playerStartTrading((event) => {
    let hasStage = event.player.stages.has("allow_trading_with_goblin");
    let isGoblin = event.merchant.getClass().getName().includes("GoblinTraderEntity");
    if (isGoblin && !hasStage) {
        event.forEachOffers((o, i) => {
            o.disabled = true;
        });
    }
});

Villager Trade event

Clear existing trades:

// for 1.18 pls use: onEvent("morejs.villager.trades")
MoreJSEvents.villagerTrades((event) => {
    /*
     * Will remove all vanilla trades. You can also just remove them for specific professions.
     */
    event.removeVanillaTrades();
    event.removeVanillaTrades([...professions], level);

    /*
     * Will remove all mod trades. You can also just remove them for specific professions.
     */
    event.removeModdedTrades();
    event.removeModdedTrades([...professions], level);
});

Adding a simple trade:

// for 1.18 pls use: onEvent("morejs.villager.trades")
MoreJSEvents.villagerTrades((event) => {
    /**
     * Adds a trade to the given profession.
     * - `profession`: The profession to add the trade to.
     * - `level`: The level, the villager needs to offer the trade.
     * - `input`: The input items for the trade. You can use a single item or an array with two items.
     * - `output`: The output items for the trade.
     */
    const trade = event.addTrade(profession, level, [...input], output);

    // `addTrade` return the trade to set optional data.
    // trade.maxUses(number); // Sets the maximum amount of uses for the trade.
    // trade.villagerExperience(number); // Sets the amount of villager experience the trade gives.
    // trade.priceMultiplier(number); // Sets the price multiplier for the trade.
    // trade.transform((offer, entity, random) => { ... }); // Transforms the offer when it's generated.
});

Adding a complex trade:

MoreJS provides you with additional functions to create complex trades. To create such a trade see VillagerUtils

// for 1.18 pls use: onEvent("morejs.villager.trades")
MoreJSEvents.villagerTrades((event) => {
    /**
     * - `trade`: The trade to add. Read the wiki for more information.
     *
     * `addTrade` returns the trade to set optional data.
     */
    event.addTrade(profession, level, trade);
});

Adding a custom trade with a callback

// for 1.18 pls use: onEvent("morejs.villager.trades")
MoreJSEvents.villagerTrades((event) => {
    /**
     * - `offer`: The trade offer
     * - `entity`: The villager entity
     * - `random`: The random number generator
     */
    event.addCustomTrade(profession, level, (offer, entity, random) => {
        offer.setFirstInput(item);
        offer.setSecondInput(item);
        offer.setOutput(item);
        offer.setMaxUses(number);
        offer.setVillagerExperience(number);
        offer.setPriceMultiplier(number);
    });
});

Wanderer Trades

You can also modify wanderer trades. Just use morejs.wanderer.trades (1.18) or MoreJSEvents.wandererTrades (1.19) event instead. The difference is, that you don't use a profession. The wanderer also has 2 levels internally. The first level are for standard trades. The second level are for special trades. You can read more about it on https://minecraft.fandom.com/wiki/Trading#Wandering_trader