Migrando do @shopify/polaris-tokens
O @shopify/polaris-tokens é o pacote de tokens do Polaris React. Os web components do Polaris não o usam: o runtime define as próprias variáveis, e a maioria dos nomes se mantém. Se o CSS do seu app veio de um app em Polaris React, compare-o com estas listas. Um nome que só existe no pacote legado não tem valor em um app com web components, então o CSS que o usa recebe o fallback de var() que você escreveu, ou nada.
Em @shopify/polaris-tokens 9.4.2, não definidas pelo runtime dos web components (87)
--p-color-bg-fill-emphasis--p-color-bg-fill-emphasis-active--p-color-bg-fill-emphasis-hover--p-color-bg-fill-magic--p-color-bg-fill-magic-secondary--p-color-bg-fill-magic-secondary-active--p-color-bg-fill-magic-secondary-hover--p-color-bg-surface-emphasis--p-color-bg-surface-emphasis-active--p-color-bg-surface-emphasis-hover--p-color-bg-surface-magic--p-color-bg-surface-magic-active--p-color-bg-surface-magic-hover--p-color-border-emphasis--p-color-border-emphasis-active--p-color-border-emphasis-hover--p-color-border-magic--p-color-border-magic-secondary--p-color-border-magic-secondary-hover--p-color-icon-emphasis--p-color-icon-emphasis-active--p-color-icon-emphasis-hover--p-color-icon-magic--p-color-text-emphasis--p-color-text-emphasis-active--p-color-text-emphasis-hover--p-color-text-emphasis-on-bg-fill--p-color-text-emphasis-on-bg-fill-active--p-color-text-emphasis-on-bg-fill-hover--p-color-text-magic--p-color-text-magic-on-bg-fill--p-color-text-magic-secondary--p-text-body-lg-font-family--p-text-body-lg-font-letter-spacing--p-text-body-lg-font-line-height--p-text-body-lg-font-size--p-text-body-lg-font-weight--p-text-body-md-font-family--p-text-body-md-font-letter-spacing--p-text-body-md-font-line-height--p-text-body-md-font-size--p-text-body-md-font-weight--p-text-body-sm-font-family--p-text-body-sm-font-letter-spacing--p-text-body-sm-font-line-height--p-text-body-sm-font-size--p-text-body-sm-font-weight--p-text-body-xs-font-family--p-text-body-xs-font-letter-spacing--p-text-body-xs-font-line-height--p-text-body-xs-font-size--p-text-body-xs-font-weight--p-text-heading-2xl-font-family--p-text-heading-2xl-font-letter-spacing--p-text-heading-2xl-font-line-height--p-text-heading-2xl-font-size--p-text-heading-2xl-font-weight--p-text-heading-3xl-font-family--p-text-heading-3xl-font-letter-spacing--p-text-heading-3xl-font-line-height--p-text-heading-3xl-font-size--p-text-heading-3xl-font-weight--p-text-heading-lg-font-family--p-text-heading-lg-font-letter-spacing--p-text-heading-lg-font-line-height--p-text-heading-lg-font-size--p-text-heading-lg-font-weight--p-text-heading-md-font-family--p-text-heading-md-font-letter-spacing--p-text-heading-md-font-line-height--p-text-heading-md-font-size--p-text-heading-md-font-weight--p-text-heading-sm-font-family--p-text-heading-sm-font-letter-spacing--p-text-heading-sm-font-line-height--p-text-heading-sm-font-size--p-text-heading-sm-font-weight--p-text-heading-xl-font-family--p-text-heading-xl-font-letter-spacing--p-text-heading-xl-font-line-height--p-text-heading-xl-font-size--p-text-heading-xl-font-weight--p-text-heading-xs-font-family--p-text-heading-xs-font-letter-spacing--p-text-heading-xs-font-line-height--p-text-heading-xs-font-size--p-text-heading-xs-font-weight
Definidas pelo runtime dos web components, não em @shopify/polaris-tokens (343)
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