@tenk/engine

A recursive stacking algorithm that can be used in the browser / a backend service to produce only the metadata for your project.

Install

npm i @tenk/engine

Usage

import tenk from "@tenk/engine";

const metadata = tenk([
  {
    name: "Background",
    elements: [
      { name: "Red" },
      { name: "Blue" },
      { name: "Rare", weight: 0.1 }
    ],
    attribute: (layer) => ({
      trait_type: 'Bg',
      value: layer.selectedElement.name
    })
  },
  {
    name: "Body",
    elements: [
      { name: "Big" },
      { name: "Medium" },
      { name: "Small" },
    ]
  },
  {
    name: "Hair",
    elements: [
      { name: "Long" },
      { name: "Medium" },
      { name: "Short" },
    ]
  }
]);
/*
 [
   { 
     "name": "1",
      "attributes": [
        { "trait_type": "Bg", "value": "Red" },
        { "trait_type": "Body", "value": "Medium" },
        { "trait_type": "Hair", "value": "Short" }
      ]
    },
    ... other tokens
  ]
*/

Layer

---

• name
• elements
• attribute

name

The layer name

elements

A list of elements

attribute(layer: Layer, tokenLayers: Layer[], dna: string): Attribute | null;

Use this function to customize a layer's attribute.

tenk([
  {
    name: "Headwear_Baseball Cap",
    attribute: (layer, _tokenLayers, dna) => ({
      trait_type: 'Baseball Cap',
      value: layer.selectedElement.name,
      dna
    })
  },
])

If you need to omit a layer's attribute you can return null.

tenk([
  {
    name: "Character Outline",
    attribute: (layer) => null
  },
])

Options

---

• brokenRuleThreshold
• duplicateThreshold
• size
• modifyLayers
• modifyMetadata

brokenRuleThreshold: number

If you have rules set on your layers like cannotAccompany or mustAccompany this is the amount of times the collection algorithm is allowed to break those rules before it exits.

duplicateThreshold: number

If the collection algorithm creates more than this amount of duplicate tokens, it will exit.

size: number

This is the size limit of the collection. Defaults is 10,000.

modifyLayers(tokenLayers: Layer[], tokenId: number, allLayers: Layer[]): Layer[]

This is a function that you can define that will allow you to alter the chosen layers for any specific token. For example:

tenk(layers, {
  modifyLayers(tokenLayers, tokenId, allLayers) {
    const specialBgIdx = tokenLayers.findIndex(layer => layer.name === 'Special Background')
    if (specialBgIdx > -1) {
      const specialElement = allLayers.find(layer => layer.name === "Special Element")
      tokenLayers.splice(specialElement, 0, specialElement);
    }
    return tokenLayers;
  }
})

modifyMetadata(tokenId: number, attributes: Attribute[], tokenLayers: Layer[], dna: string): Metadata

This function will allow you to modify each token's metadata. For example:

tenk(layers, {
  modifyMetadata(tokenId, attributes, tokenLayers, dna) {
    return {
      name: `Tank #${tokenId}`,
      description: someGeneratedDescription(tokenId, dna)
    }
  }
})