2026年6月30日以降のShopify Scripts：Functionsへの移行

node --version
# Check the version required by your installed Shopify CLI

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
rustup target add wasm32-unknown-unknown
cargo --version

# Create a new Shopify app (skip if you already have one)
shopify app init --name my-checkout-functions
cd my-checkout-functions

# Generate a Function extension
shopify app generate extension

extensions/volume-discount-fn/
├── shopify.extension.toml      # Function config — targets, build, version
├── src/
│   ├── cart_lines_discounts_generate_run.graphql   # Input query
│   └── cart_lines_discounts_generate_run.rs        # Function logic
├── Cargo.toml                  # Rust dependencies (Rust only)
└── README.md

api_version = "2026-10"
 
[[extensions]]
name = "volume-discount-fn"
handle = "volume-discount-fn"
type = "function"
  
[[extensions.targeting]]
target = "cart.lines.discounts.generate.run"
input_query = "src/cart_lines_discounts_generate_run.graphql"
export = "cart_lines_discounts_generate_run"
   
[extensions.build]
command = "cargo build --target=wasm32-unknown-unknown --release"
path = "target/wasm32-unknown-unknown/release/volume-discount-fn.wasm"
watch = ["src/**/*.rs"]

query Input {
  cart {
    lines {
      id
      quantity
      cost {
        subtotalAmount {
          amount
        }
      }
      merchandise {
        ... on ProductVariant {
          product {
            inAnyCollection(ids: ["gid://shopify/Collection/123456789"])
          }
        } 
      } 
    }
  }
  discount {
    discountClasses
  } 
}

# Local development with hot reload
shopify app dev
         
# When ready, deploy
shopify app deploy
          
# In the GraphiQL panel that opens (press `g` in the dev terminal),
# create the automatic discount that uses your Function:

mutation CreateAutomaticDiscount($startsAt: DateTime!) {
  discountAutomaticAppCreate(
    automaticAppDiscount: {
      title: "Volume Discount (5+ collection items)"
      functionHandle: "volume-discount-fn"
      discountClasses: [ORDER]
      startsAt: $startsAt
    }   
  ) {
    automaticAppDiscount { discountId }
    userErrors { field message }
  }  
}  

shopify app generate extension --template delivery_customization --flavor vanilla-js --name hide-express-fn

query CartDeliveryOptionsTransformRunInput { 
  cart { 
    cost {
      subtotalAmount {
        amount
      }  
    }    
    deliveryGroups {
      deliveryOptions {
        handle
        title
      }   
    }     
  }   
}   

// @ts-check
/**
 * @typedef {import("../generated/api").CartDeliveryOptionsTransformRunInput} CartDeliveryOptionsTransformRunInput
 * @typedef {import("../generated/api").CartDeliveryOptionsTransformRunResult} CartDeliveryOptionsTransformRunResult
 */
           
/** @type {CartDeliveryOptionsTransformRunResult} */
const NO_CHANGES = { operations: [] };
const THRESHOLD = 500.0;
const HIDE_TITLES = ["Express", "Overnight"];
            
/** 
 * @param {CartDeliveryOptionsTransformRunInput} input
 * @returns {CartDeliveryOptionsTransformRunResult}
 */ 
export function cartDeliveryOptionsTransformRun(input) {
  const subtotal = parseFloat(input.cart.cost.subtotalAmount.amount);
  if (subtotal < THRESHOLD) return NO_CHANGES;
             
  const operations = input.cart.deliveryGroups.flatMap((group) =>
    group.deliveryOptions
      .filter((opt) => HIDE_TITLES.some((t) => (opt.title ?? "").includes(t)))
      .map((opt) => ({
        deliveryOptionHide: { deliveryOptionHandle: opt.handle },
      }))
  );
              
  return { operations };
}    

mutation CreateDeliveryCustomization($functionHandle: String!) {
  deliveryCustomizationCreate(deliveryCustomization: {
    functionHandle: $functionHandle
    title: "Hide express shipping above cart threshold"
    enabled: true
  }) {
    deliveryCustomization { id enabled }
    userErrors { field message }
  }
}

shopify app generate extension --template payment_customization --flavor vanilla-js --name hide-cod-b2b-fn

query CartPaymentMethodsTransformRunInput {  
  cart {  
    buyerIdentity {
      customer {
        hasTags(tags: ["B2B"]) {
          tag
          hasTag
        }  
      }    
    }      
  }    
  paymentMethods {
    id
    name
  }     
}     

// @ts-check
/**
 * @typedef {import("../generated/api").CartPaymentMethodsTransformRunInput} CartPaymentMethodsTransformRunInput
 * @typedef {import("../generated/api").CartPaymentMethodsTransformRunResult} CartPaymentMethodsTransformRunResult
 */
/** @type {CartPaymentMethodsTransformRunResult} */
const NO_CHANGES = { operations: [] }; 
               
/**
 * @param {CartPaymentMethodsTransformRunInput} input
 * @returns {CartPaymentMethodsTransformRunResult}
 */
export function cartPaymentMethodsTransformRun(input) { 
  const tagCheck = input.cart?.buyerIdentity?.customer?.hasTags?.[0];
  const isB2B = tagCheck?.hasTag === true;
  if (!isB2B) return NO_CHANGES;
                
  const codMethod = input.paymentMethods.find((pm) =>
    pm.name.toLowerCase().includes("cash on delivery")
  ); 
  if (!codMethod) return NO_CHANGES;
                 
  return {
    operations: [{ paymentMethodHide: { paymentMethodId: codMethod.id } }],
  };
}      

mutation CreatePaymentCustomization($functionHandle: String!) {
  paymentCustomizationCreate(paymentCustomization: {
    functionHandle: $functionHandle
    title: "Hide Cash on Delivery for B2B-tagged customers"
    enabled: true
  }) {
    paymentCustomization { id enabled }
    userErrors { field message }
  }
}

// Rust example: return this target's empty result for non-testers
let is_tester = input
    .cart()
    .buyer_identity()
    .and_then(|bi| bi.customer())
    .map(|c| c.has_any_tag())
    .unwrap_or(&false);
                  
if !*is_tester {
    return Ok(default_result);  // No operations from this Function
}       
                   
// New Function logic only runs for tagged users

cart {
  buyerIdentity {
    customer {
      hasAnyTag(tags: ["FN-TESTER"])
    }       
  }      
}        

# .github/workflows/deploy-functions.yml
name: Deploy Shopify Functions
on:
  push:
    branches: [main]
jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with: { node-version: '22' }
      - uses: dtolnay/rust-toolchain@stable
        with: { targets: wasm32-unknown-unknown }
      - run: npm install -g @shopify/cli@latest
      - run: shopify app deploy --force
        env:
          SHOPIFY_APP_AUTOMATION_TOKEN: ${{ secrets.SHOPIFY_APP_AUTOMATION_TOKEN }}

shopify app versions list
shopify app release --version <previous-version-id>