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diff --git a/browser/components/migration/content/migration-wizard-constants.mjs b/browser/components/migration/content/migration-wizard-constants.mjs
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+++ b/browser/components/migration/content/migration-wizard-constants.mjs
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+export const MigrationWizardConstants = Object.freeze({
+  MIGRATOR_TYPES: Object.freeze({
+    BROWSER: "browser",
+    FILE: "file",
+  }),
+
+  /**
+   * A mapping of a page identification string to the IDs used by the
+   * various wizard pages. These are used by MigrationWizard.setState
+   * to set the current page.
+   *
+   * @type {Object<string, string>}
+   */
+  PAGES: Object.freeze({
+    LOADING: "loading",
+    SELECTION: "selection",
+    PROGRESS: "progress",
+    FILE_IMPORT_PROGRESS: "file-import-progress",
+    SAFARI_PERMISSION: "safari-permission",
+    SAFARI_PASSWORD_PERMISSION: "safari-password-permission",
+    NO_BROWSERS_FOUND: "no-browsers-found",
+  }),
+
+  /**
+   * Returns a mapping of a resource type to a string used to identify
+   * the associated resource group in the wizard via a data-resource-type
+   * attribute. The keys are used to set which items should be shown and
+   * in what state in #onShowingProgress.
+   *
+   * @type {Object<string, string>}
+   */
+  DISPLAYED_RESOURCE_TYPES: Object.freeze({
+    // The DISPLAYED_RESOURCE_TYPES should have their keys match those
+    // in MigrationUtils.resourceTypes.
+
+    // This is a little silly, but JavaScript doesn't have a notion of
+    // enums. The advantage of this set-up is that these constants values
+    // can be used to access the MigrationUtils.resourceTypes constants,
+    // are reasonably readable as DOM attributes, and easily serialize /
+    // deserialize.
+    HISTORY: "HISTORY",
+    FORMDATA: "FORMDATA",
+    PASSWORDS: "PASSWORDS",
+    BOOKMARKS: "BOOKMARKS",
+    PAYMENT_METHODS: "PAYMENT_METHODS",
+
+    // We don't yet show OTHERDATA or SESSION resources.
+  }),
+
+  DISPLAYED_FILE_RESOURCE_TYPES: Object.freeze({
+    // When migrating passwords from a file, we first show the progress
+    // for a single PASSWORDS_FROM_FILE resource type, and then upon
+    // completion, show two different resource types - one for new
+    // passwords imported from the file, and one for existing passwords
+    // that were updated from the file.
+    PASSWORDS_FROM_FILE: "PASSWORDS_FROM_FILE",
+    PASSWORDS_NEW: "PASSWORDS_NEW",
+    PASSWORDS_UPDATED: "PASSWORDS_UPDATED",
+    BOOKMARKS_FROM_FILE: "BOOKMARKS_FROM_FILE",
+  }),
+
+  /**
+   * The set of keys that maps to migrators that use the term "favorites"
+   * in the place of "bookmarks". This tends to be browsers from Microsoft.
+   */
+  USES_FAVORITES: Object.freeze([
+    "chromium-edge",
+    "chromium-edge-beta",
+    "edge",
+    "ie",
+  ]),
+});