Contentful Compose: Renaming existing page content type to make way for Compose page content type

rename-page-content-type-for-compose.ts

// Example of a migration script for renaming an existing "page" content type to "legacyPage"
// to make room for Contentful Compose "page" content type
// The following example is written in TypeScript
import { MigrationFunction } from "contentful-migration";
import murmurhash from "murmurhash";

const migrate: MigrationFunction = (migration) => {
  // Create a duplicate of the clashing page content type
  const pageCopy = migration
    .createContentType("legacyPage")
    .name("Legacy Page")
    .displayField("internalName");

  // Here you would define all of the fields that your legacy page already has
  pageCopy.createField("internalName").name("Internal name").type("Symbol");

  pageCopy
    .createField("title")
    .name("Page title")
    .type("Symbol")
    .localized(true);

  // Change content type of existing entries
  migration.transformEntriesToType({
    sourceContentType: "page",
    targetContentType: "legacyPage",
    shouldPublish: "preserve",
    updateReferences: true,
    removeOldEntries: true,
    identityKey: function (fromFields) {
      return murmurhash
        .v3(`pageCopy-${fromFields.title["en-US"].toLowerCase()}`)
        .toString();
    },
    transformEntryForLocale: function (fromFields, currentLocale) {
      // We want all fields transfered as is
      return Object.keys(fromFields).reduce((prev, current) => {
        return {
          ...prev,
          [current]: fromFields[current][currentLocale],
        };
      }, {});
    },
  });

  // The migration is now done, you can delete the page content type in the next migration
};

module.exports = migrate;