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astrolabe/src/app/infrastructure/theme-migrations.ts
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TypeScript

/**
* Read-time migration for CustomTheme records (docs/architecture/02 §4).
*
* Mirrors snippet/dataset migrations: every theme read from storage passes
* through `migrateCustomTheme`, which fills missing/invalid fields and stamps
* the current version. Unknown fields are tolerated (spread the original, only
* fill gaps) so a record written by a newer build round-trips without loss.
*/
import { CURRENT_THEME_VERSION, type CustomTheme } from '@core/custom-theme';
import { isJsonObject } from '@core/spec-config';
/** Upgrade a raw stored record to the current CustomTheme shape. */
export function migrateCustomTheme(raw: unknown): CustomTheme {
const r = { ...(raw as Record<string, unknown>) };
return {
...r,
id: typeof r.id === 'number' ? r.id : Number(r.id),
version: CURRENT_THEME_VERSION,
name: typeof r.name === 'string' ? r.name : 'Untitled theme',
config: isJsonObject(r.config) ? r.config : {},
created: typeof r.created === 'string' ? r.created : new Date(0).toISOString(),
modified: typeof r.modified === 'string' ? r.modified : new Date(0).toISOString(),
};
}