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lasset

v0.4.0

Published

Lasset exists because cache invalidation is hard especially when cache entries are interdependent.

Downloads

16

Readme

Lasset

Lasset exists because cache invalidation is hard especially when cache entries are interdependent.

Usage

import {Lasset} from 'lasset'

// Create lasset that supports two asset factories brick and wall
const assets = new Lasset({
  // offer a brick asset type that builds a single brick
  async brick({ name }) {
    return `[${name}]`
  },
  // load a wall (and build needed bricks for it)
  async wall({ name }, load) {
    const brickA = await load({ type: 'brick', name: 'a' })
    const brickB = await load({ type: 'brick', name: 'b' })
    return `${name} ${brickA} ${brickB}`
  }
})

// load a wall (and build needed bricks for it)
const wall = await assets.load({ type: 'wall', name: 'WALL' })
// or equivalently
const wall2 = await assets.loaders.wall({ name: 'WALL' })

console.log(wall) //  Outputs WALL [a] [b]
console.log(wall2) // Outputs WALL [a] [b] too since

// invalidate the wall asset using its cache key
assets.invalidate({type: 'wall', name: 'WALL'}) 
await assets.load({type: 'wall', name: 'WALL'}) // causes wall/WALL to be rebuilt but not brick/a or brick/b

assets.invalidate({type: 'brick', name: 'a'}) 
await assets.load({type: 'wall', name: 'WALL'}) // causes brick/a and wall/WALL to be rebuilt but not brick/b