Method with

src/main/java/org/bukkit/FireworkEffect.java:76–81

Specify the type of the firework effect. @param type The effect type @return This object, for chaining @throws IllegalArgumentException If type is null

(@NotNull Type type)

         * @throws IllegalArgumentException If type is null
         */
        @NotNull
        public Builder with(@NotNull Type type) throws IllegalArgumentException {
            Validate.notNull(type, "Cannot have null type");
            this.type = type;
            return this;
        }

        /**
         * Add a flicker to the firework effect.