@hackplan/polaris/esnext/styles/polaris-tokens/spacing.json

Shopify’s product component library

{
  "spacing-none": 0,
  "spacing-extra-tight": "4px",
  "spacing-tight": "8px",
  "spacing-base-tight": "12px",
  "spacing-base": "16px",
  "spacing-loose": "20px",
  "spacing-extra-loose": "32px"
}