Transform Specification

[Experimental]
backpackjs transform spec (v2) [Experimental]
Transforms are functions that take product and collection data sourced earlier in the backpack build process and allow implementers to alter or augment that data before it's passed on to the storefront and used to create and render product and collection pages.
Implementers declare which transforms should run in the backpack.config.json file under the transforms key as an array of identifiers. Transforms are run in the order they are declared in the config. Declarations can take one of two forms:
identifier: String
[identifier: String, options: Object]
If included, options are passed to the transform function. An identifier can be one of the following:
name of npm package exporting transform function
e.g. @backpackjs/transform-shopify
path to file exporting transform function
e.g. ./transforms/shopify.js
The location the identifier points to must export a function that receives an object as an argument and returns an object containing the product and collection data modified by the transform function.
module.exports = (input: Object) => { products: Object[], collections: Object[] }
The returned data should be an object with the transformed product data under the products key and the transformed collection data should be under the collections key. Additional keys returned will be ignored.
Note: It is valid to return the initially passed in product and collection data unchanged. Usually, this would be done in a situation where you need to run some kind of side-effect or produce an artifact using updated product and collection data (e.g. products-feed with augmented data), but don't update any data.
Product and collection data returned from a transform at a minimum must have:
a unique handle property
only needs to be unique amongst type (i.e. product and collection), a collection and product can share the same handle
a publishedAt property
must be date string in ISO 8601 format or null for unpublished product or collection
Arguments
The transform function is passed a single inputs object argument:
input: Object
products: Object[]
product data returned from the pervious transform function, or in the case of the first transform, the product data sourced earlier in the build
collections: Object[]
collection data returned from the pervious transform function, or in the case of the first transform, the collection data sourced earlier in the build
options: Object
options provided by the implementer in backpack.config.json
log: Object
object with error and message methods used for logging strings or array of strings
e.g. 
log.error('this was a mistake');
log.message(['merged 43 products', 'merged 4 collections'])
graphql: Object
object with tag and client keys
tag is an alias to the gql export from the @apollo/client package
client is a preconfigured apollo graphql client attached to the backpackjs graphql api
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