@tldraw/store/dist-esm/lib/migrate.mjs.map

tldraw infinite canvas SDK (store).

{
  "version": 3,
  "sources": ["../../src/lib/migrate.ts"],
  "sourcesContent": ["import { assert, objectMapEntries } from '@tldraw/utils'\nimport { UnknownRecord } from './BaseRecord'\nimport { SerializedStore } from './Store'\nimport { SerializedSchema } from './StoreSchema'\n\nfunction squashDependsOn(sequence: Array<Migration | StandaloneDependsOn>): Migration[] {\n\tconst result: Migration[] = []\n\tfor (let i = sequence.length - 1; i >= 0; i--) {\n\t\tconst elem = sequence[i]\n\t\tif (!('id' in elem)) {\n\t\t\tconst dependsOn = elem.dependsOn\n\t\t\tconst prev = result[0]\n\t\t\tif (prev) {\n\t\t\t\tresult[0] = {\n\t\t\t\t\t...prev,\n\t\t\t\t\tdependsOn: dependsOn.concat(prev.dependsOn ?? []),\n\t\t\t\t}\n\t\t\t}\n\t\t} else {\n\t\t\tresult.unshift(elem)\n\t\t}\n\t}\n\treturn result\n}\n\n/**\n * Creates a migration sequence that defines how to transform data as your schema evolves.\n *\n * A migration sequence contains a series of migrations that are applied in order to transform\n * data from older versions to newer versions. Each migration is identified by a unique ID\n * and can operate at either the record level (transforming individual records) or store level\n * (transforming the entire store structure).\n *\n * See the [migration guide](https://tldraw.dev/docs/persistence#Migrations) for more info on how to use this API.\n * @param options - Configuration for the migration sequence\n *   - sequenceId - Unique identifier for this migration sequence (e.g., 'com.myapp.book')\n *   - sequence - Array of migrations or dependency declarations to include in the sequence\n *   - retroactive - Whether migrations should apply to snapshots created before this sequence was added (defaults to true)\n * @returns A validated migration sequence that can be included in a store schema\n * @example\n * ```ts\n * const bookMigrations = createMigrationSequence({\n *   sequenceId: 'com.myapp.book',\n *   sequence: [\n *     {\n *       id: 'com.myapp.book/1',\n *       scope: 'record',\n *       up: (record) => ({ ...record, newField: 'default' })\n *     }\n *   ]\n * })\n * ```\n * @public\n */\nexport function createMigrationSequence({\n\tsequence,\n\tsequenceId,\n\tretroactive = true,\n}: {\n\tsequenceId: string\n\tretroactive?: boolean\n\tsequence: Array<Migration | StandaloneDependsOn>\n}): MigrationSequence {\n\tconst migrations: MigrationSequence = {\n\t\tsequenceId,\n\t\tretroactive,\n\t\tsequence: squashDependsOn(sequence),\n\t}\n\tvalidateMigrations(migrations)\n\treturn migrations\n}\n\n/**\n * Creates a named set of migration IDs from version numbers and a sequence ID.\n *\n * This utility function helps generate properly formatted migration IDs that follow\n * the required `sequenceId/version` pattern. It takes a sequence ID and a record\n * of named versions, returning migration IDs that can be used in migration definitions.\n *\n * See the [migration guide](https://tldraw.dev/docs/persistence#Migrations) for more info on how to use this API.\n * @param sequenceId - The sequence identifier (e.g., 'com.myapp.book')\n * @param versions - Record mapping version names to numbers\n * @returns Record mapping version names to properly formatted migration IDs\n * @example\n * ```ts\n * const migrationIds = createMigrationIds('com.myapp.book', {\n *   addGenre: 1,\n *   addPublisher: 2,\n *   removeOldField: 3\n * })\n * // Result: {\n * //   addGenre: 'com.myapp.book/1',\n * //   addPublisher: 'com.myapp.book/2',\n * //   removeOldField: 'com.myapp.book/3'\n * // }\n * ```\n * @public\n */\nexport function createMigrationIds<\n\tconst ID extends string,\n\tconst Versions extends Record<string, number>,\n>(sequenceId: ID, versions: Versions): { [K in keyof Versions]: `${ID}/${Versions[K]}` } {\n\treturn Object.fromEntries(\n\t\tobjectMapEntries(versions).map(([key, version]) => [key, `${sequenceId}/${version}`] as const)\n\t) as any\n}\n\n/**\n * Creates a migration sequence specifically for record-level migrations.\n *\n * This is a convenience function that creates a migration sequence where all migrations\n * operate at the record scope and are automatically filtered to apply only to records\n * of a specific type. Each migration in the sequence will be enhanced with the record\n * scope and appropriate filtering logic.\n * @param opts - Configuration for the record migration sequence\n *   - recordType - The record type name these migrations should apply to\n *   - filter - Optional additional filter function to determine which records to migrate\n *   - retroactive - Whether migrations should apply to snapshots created before this sequence was added\n *   - sequenceId - Unique identifier for this migration sequence\n *   - sequence - Array of record migration definitions (scope will be added automatically)\n * @returns A migration sequence configured for record-level operations\n * @internal\n */\nexport function createRecordMigrationSequence(opts: {\n\trecordType: string\n\tfilter?(record: UnknownRecord): boolean\n\tretroactive?: boolean\n\tsequenceId: string\n\tsequence: Omit<Extract<Migration, { scope: 'record' }>, 'scope'>[]\n}): MigrationSequence {\n\tconst sequenceId = opts.sequenceId\n\treturn createMigrationSequence({\n\t\tsequenceId,\n\t\tretroactive: opts.retroactive ?? true,\n\t\tsequence: opts.sequence.map((m) =>\n\t\t\t'id' in m\n\t\t\t\t? {\n\t\t\t\t\t\t...m,\n\t\t\t\t\t\tscope: 'record',\n\t\t\t\t\t\tfilter: (r: UnknownRecord) =>\n\t\t\t\t\t\t\tr.typeName === opts.recordType &&\n\t\t\t\t\t\t\t(m.filter?.(r) ?? true) &&\n\t\t\t\t\t\t\t(opts.filter?.(r) ?? true),\n\t\t\t\t\t}\n\t\t\t\t: m\n\t\t),\n\t})\n}\n\n/**\n * Legacy migration interface for backward compatibility.\n *\n * This interface represents the old migration format that included both `up` and `down`\n * transformation functions. While still supported, new code should use the `Migration`\n * type which provides more flexibility and better integration with the current system.\n * @public\n */\nexport interface LegacyMigration<Before = any, After = any> {\n\t// eslint-disable-next-line @typescript-eslint/method-signature-style\n\tup: (oldState: Before) => After\n\t// eslint-disable-next-line @typescript-eslint/method-signature-style\n\tdown: (newState: After) => Before\n}\n\n/**\n * Unique identifier for a migration in the format `sequenceId/version`.\n *\n * Migration IDs follow a specific pattern where the sequence ID identifies the migration\n * sequence and the version number indicates the order within that sequence. For example:\n * 'com.myapp.book/1', 'com.myapp.book/2', etc.\n * @public\n */\nexport type MigrationId = `${string}/${number}`\n\n/**\n * Declares dependencies for migrations without being a migration itself.\n *\n * This interface allows you to specify that future migrations in a sequence depend on\n * migrations from other sequences, without defining an actual migration transformation.\n * It's used to establish cross-sequence dependencies in the migration graph.\n * @public\n */\nexport interface StandaloneDependsOn {\n\treadonly dependsOn: readonly MigrationId[]\n}\n\n/**\n * Defines a single migration that transforms data from one schema version to another.\n *\n * A migration can operate at two different scopes:\n * - `record`: Transforms individual records, with optional filtering to target specific records\n * - `store`: Transforms the entire serialized store structure\n *\n * Each migration has a unique ID and can declare dependencies on other migrations that must\n * be applied first. The `up` function performs the forward transformation, while the optional\n * `down` function can reverse the migration if needed.\n * @public\n */\nexport type Migration = {\n\treadonly id: MigrationId\n\treadonly dependsOn?: readonly MigrationId[] | undefined\n} & (\n\t| {\n\t\t\treadonly scope: 'record'\n\t\t\t// eslint-disable-next-line @typescript-eslint/method-signature-style\n\t\t\treadonly filter?: (record: UnknownRecord) => boolean\n\t\t\t// eslint-disable-next-line @typescript-eslint/method-signature-style\n\t\t\treadonly up: (oldState: UnknownRecord) => void | UnknownRecord\n\t\t\t// eslint-disable-next-line @typescript-eslint/method-signature-style\n\t\t\treadonly down?: (newState: UnknownRecord) => void | UnknownRecord\n\t  }\n\t| {\n\t\t\treadonly scope: 'store'\n\t\t\t// eslint-disable-next-line @typescript-eslint/method-signature-style\n\t\t\treadonly up: (\n\t\t\t\toldState: SerializedStore<UnknownRecord>\n\t\t\t) => void | SerializedStore<UnknownRecord>\n\t\t\t// eslint-disable-next-line @typescript-eslint/method-signature-style\n\t\t\treadonly down?: (\n\t\t\t\tnewState: SerializedStore<UnknownRecord>\n\t\t\t) => void | SerializedStore<UnknownRecord>\n\t  }\n\t| {\n\t\t\treadonly scope: 'storage'\n\t\t\t// eslint-disable-next-line @typescript-eslint/method-signature-style\n\t\t\treadonly up: (storage: SynchronousRecordStorage<UnknownRecord>) => void\n\t\t\treadonly down?: never\n\t  }\n)\n\n/**\n * Abstraction over the store that can be used to perform migrations.\n * @public\n */\nexport interface SynchronousRecordStorage<R extends UnknownRecord> {\n\tget(id: string): R | undefined\n\tset(id: string, record: R): void\n\tdelete(id: string): void\n\tkeys(): Iterable<string>\n\tvalues(): Iterable<R>\n\tentries(): Iterable<[string, R]>\n}\n\n/**\n * Abstraction over the storage that can be used to perform migrations.\n * @public\n */\nexport interface SynchronousStorage<R extends UnknownRecord> extends SynchronousRecordStorage<R> {\n\tgetSchema(): SerializedSchema\n\tsetSchema(schema: SerializedSchema): void\n}\n\n/**\n * Base interface for legacy migration information.\n *\n * Contains the basic structure used by the legacy migration system, including version\n * range information and the migration functions indexed by version number. This is\n * maintained for backward compatibility with older migration definitions.\n * @public\n */\nexport interface LegacyBaseMigrationsInfo {\n\tfirstVersion: number\n\tcurrentVersion: number\n\tmigrators: { [version: number]: LegacyMigration }\n}\n\n/**\n * Legacy migration configuration with support for sub-type migrations.\n *\n * This interface extends the base legacy migration info to support migrations that\n * vary based on a sub-type key within records. This allows different migration paths\n * for different variants of the same record type, which was useful in older migration\n * systems but is now handled more elegantly by the current Migration system.\n * @public\n */\nexport interface LegacyMigrations extends LegacyBaseMigrationsInfo {\n\tsubTypeKey?: string\n\tsubTypeMigrations?: Record<string, LegacyBaseMigrationsInfo>\n}\n\n/**\n * A complete sequence of migrations that can be applied to transform data.\n *\n * A migration sequence represents a series of ordered migrations that belong together,\n * typically for a specific part of your schema. The sequence includes metadata about\n * whether it should be applied retroactively to existing data and contains the actual\n * migration definitions in execution order.\n * @public\n */\nexport interface MigrationSequence {\n\tsequenceId: string\n\t/**\n\t * retroactive should be true if the migrations should be applied to snapshots that were created before\n\t * this migration sequence was added to the schema.\n\t *\n\t * In general:\n\t *\n\t * - retroactive should be true when app developers create their own new migration sequences.\n\t * - retroactive should be false when library developers ship a migration sequence. When you install a library for the first time, any migrations that were added in the library before that point should generally _not_ be applied to your existing data.\n\t */\n\tretroactive: boolean\n\tsequence: Migration[]\n}\n\n/**\n * Sorts migrations using a distance-minimizing topological sort.\n *\n * This function respects two types of dependencies:\n * 1. Implicit sequence dependencies (foo/1 must come before foo/2)\n * 2. Explicit dependencies via `dependsOn` property\n *\n * The algorithm minimizes the total distance between migrations and their explicit\n * dependencies in the final ordering, while maintaining topological correctness.\n * This means when migration A depends on migration B, A will be scheduled as close\n * as possible to B (while respecting all constraints).\n *\n * Implementation uses Kahn's algorithm with priority scoring:\n * - Builds dependency graph and calculates in-degrees\n * - Uses priority queue that prioritizes migrations which unblock explicit dependencies\n * - Processes migrations in urgency order while maintaining topological constraints\n * - Detects cycles by ensuring all migrations are processed\n *\n * @param migrations - Array of migrations to sort\n * @returns Sorted array of migrations in execution order\n * @throws Assertion error if circular dependencies are detected\n * @example\n * ```ts\n * const sorted = sortMigrations([\n *   { id: 'app/2', scope: 'record', up: (r) => r },\n *   { id: 'app/1', scope: 'record', up: (r) => r },\n *   { id: 'lib/1', scope: 'record', up: (r) => r, dependsOn: ['app/1'] }\n * ])\n * // Result: [app/1, app/2, lib/1] (respects both sequence and explicit deps)\n * ```\n * @public\n */\nexport function sortMigrations(migrations: Migration[]): Migration[] {\n\tif (migrations.length === 0) return []\n\n\t// Build dependency graph and calculate in-degrees\n\tconst byId = new Map(migrations.map((m) => [m.id, m]))\n\tconst dependents = new Map<MigrationId, Set<MigrationId>>() // who depends on this\n\tconst inDegree = new Map<MigrationId, number>()\n\tconst explicitDeps = new Map<MigrationId, Set<MigrationId>>() // explicit dependsOn relationships\n\n\t// Initialize\n\tfor (const m of migrations) {\n\t\tinDegree.set(m.id, 0)\n\t\tdependents.set(m.id, new Set())\n\t\texplicitDeps.set(m.id, new Set())\n\t}\n\n\t// Add implicit sequence dependencies and explicit dependencies\n\tfor (const m of migrations) {\n\t\tconst { version, sequenceId } = parseMigrationId(m.id)\n\n\t\t// Implicit dependency on previous in sequence\n\t\tconst prevId = `${sequenceId}/${version - 1}` as MigrationId\n\t\tif (byId.has(prevId)) {\n\t\t\tdependents.get(prevId)!.add(m.id)\n\t\t\tinDegree.set(m.id, inDegree.get(m.id)! + 1)\n\t\t}\n\n\t\t// Explicit dependencies\n\t\tif (m.dependsOn) {\n\t\t\tfor (const depId of m.dependsOn) {\n\t\t\t\tif (byId.has(depId)) {\n\t\t\t\t\tdependents.get(depId)!.add(m.id)\n\t\t\t\t\texplicitDeps.get(m.id)!.add(depId)\n\t\t\t\t\tinDegree.set(m.id, inDegree.get(m.id)! + 1)\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t// Priority queue: migrations ready to process (in-degree 0)\n\tconst ready = migrations.filter((m) => inDegree.get(m.id) === 0)\n\tconst result: Migration[] = []\n\tconst processed = new Set<MigrationId>()\n\n\twhile (ready.length > 0) {\n\t\t// Calculate urgency scores for ready migrations and pick the best one\n\t\tlet bestCandidate: Migration | undefined\n\t\tlet bestCandidateScore = -Infinity\n\n\t\tfor (const m of ready) {\n\t\t\tlet urgencyScore = 0\n\n\t\t\tfor (const depId of dependents.get(m.id) || []) {\n\t\t\t\tif (!processed.has(depId)) {\n\t\t\t\t\t// Priority 1: Count all unprocessed dependents (to break ties)\n\t\t\t\t\turgencyScore += 1\n\n\t\t\t\t\t// Priority 2: If this migration is explicitly depended on by others, boost priority\n\t\t\t\t\tif (explicitDeps.get(depId)!.has(m.id)) {\n\t\t\t\t\t\turgencyScore += 100\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif (\n\t\t\t\turgencyScore > bestCandidateScore ||\n\t\t\t\t// Tiebreaker: prefer lower sequence/version\n\t\t\t\t(urgencyScore === bestCandidateScore && m.id.localeCompare(bestCandidate?.id ?? '') < 0)\n\t\t\t) {\n\t\t\t\tbestCandidate = m\n\t\t\t\tbestCandidateScore = urgencyScore\n\t\t\t}\n\t\t}\n\n\t\tconst nextMigration = bestCandidate!\n\t\tready.splice(ready.indexOf(nextMigration), 1)\n\n\t\t// Cycle detection - if we have processed everything and still have items left, there's a cycle\n\t\t// This is handled by Kahn's algorithm naturally - if we finish with items unprocessed, there's a cycle\n\n\t\t// Process this migration\n\t\tresult.push(nextMigration)\n\t\tprocessed.add(nextMigration.id)\n\n\t\t// Update in-degrees and add newly ready migrations\n\t\tfor (const depId of dependents.get(nextMigration.id) || []) {\n\t\t\tif (!processed.has(depId)) {\n\t\t\t\tinDegree.set(depId, inDegree.get(depId)! - 1)\n\t\t\t\tif (inDegree.get(depId) === 0) {\n\t\t\t\t\tready.push(byId.get(depId)!)\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t// Check for cycles - if we didn't process all migrations, there's a cycle\n\tif (result.length !== migrations.length) {\n\t\tconst unprocessed = migrations.filter((m) => !processed.has(m.id))\n\t\tassert(false, `Circular dependency in migrations: ${unprocessed[0].id}`)\n\t}\n\n\treturn result\n}\n\n/**\n * Parses a migration ID to extract the sequence ID and version number.\n *\n * Migration IDs follow the format `sequenceId/version`, and this function splits\n * them into their component parts. This is used internally for sorting migrations\n * and understanding their relationships.\n * @param id - The migration ID to parse\n * @returns Object containing the sequence ID and numeric version\n * @example\n * ```ts\n * const { sequenceId, version } = parseMigrationId('com.myapp.book/5')\n * // sequenceId: 'com.myapp.book', version: 5\n * ```\n * @internal\n */\nexport function parseMigrationId(id: MigrationId): { sequenceId: string; version: number } {\n\tconst [sequenceId, version] = id.split('/')\n\treturn { sequenceId, version: parseInt(version) }\n}\n\nfunction validateMigrationId(id: string, expectedSequenceId?: string) {\n\tif (expectedSequenceId) {\n\t\tassert(\n\t\t\tid.startsWith(expectedSequenceId + '/'),\n\t\t\t`Every migration in sequence '${expectedSequenceId}' must have an id starting with '${expectedSequenceId}/'. Got invalid id: '${id}'`\n\t\t)\n\t}\n\n\tassert(id.match(/^(.*?)\\/(0|[1-9]\\d*)$/), `Invalid migration id: '${id}'`)\n}\n\n/**\n * Validates that a migration sequence is correctly structured.\n *\n * Performs several validation checks to ensure the migration sequence is valid:\n * - Sequence ID doesn't contain invalid characters\n * - All migration IDs belong to the expected sequence\n * - Migration versions start at 1 and increment by 1\n * - Migration IDs follow the correct format\n * @param migrations - The migration sequence to validate\n * @throws Assertion error if any validation checks fail\n * @example\n * ```ts\n * const sequence = createMigrationSequence({\n *   sequenceId: 'com.myapp.book',\n *   sequence: [{ id: 'com.myapp.book/1', scope: 'record', up: (r) => r }]\n * })\n * validateMigrations(sequence) // Passes validation\n * ```\n * @public\n */\nexport function validateMigrations(migrations: MigrationSequence) {\n\tassert(\n\t\t!migrations.sequenceId.includes('/'),\n\t\t`sequenceId cannot contain a '/', got ${migrations.sequenceId}`\n\t)\n\tassert(migrations.sequenceId.length, 'sequenceId must be a non-empty string')\n\n\tif (migrations.sequence.length === 0) {\n\t\treturn\n\t}\n\n\tvalidateMigrationId(migrations.sequence[0].id, migrations.sequenceId)\n\tlet n = parseMigrationId(migrations.sequence[0].id).version\n\tassert(\n\t\tn === 1,\n\t\t`Expected the first migrationId to be '${migrations.sequenceId}/1' but got '${migrations.sequence[0].id}'`\n\t)\n\tfor (let i = 1; i < migrations.sequence.length; i++) {\n\t\tconst id = migrations.sequence[i].id\n\t\tvalidateMigrationId(id, migrations.sequenceId)\n\t\tconst m = parseMigrationId(id).version\n\t\tassert(\n\t\t\tm === n + 1,\n\t\t\t`Migration id numbers must increase in increments of 1, expected ${migrations.sequenceId}/${n + 1} but got '${migrations.sequence[i].id}'`\n\t\t)\n\t\tn = m\n\t}\n}\n\n/**\n * Result type returned by migration operations.\n *\n * Migration operations can either succeed and return the transformed value,\n * or fail with a specific reason. This discriminated union type allows for\n * safe handling of both success and error cases when applying migrations.\n * @public\n */\nexport type MigrationResult<T> =\n\t| { type: 'success'; value: T }\n\t| { type: 'error'; reason: MigrationFailureReason }\n\n/**\n * Enumeration of possible reasons why a migration might fail.\n *\n * These reasons help identify what went wrong during migration processing,\n * allowing applications to handle different failure scenarios appropriately.\n * Common failures include incompatible data formats, unknown record types,\n * and version mismatches between the data and available migrations.\n * @public\n */\nexport enum MigrationFailureReason {\n\tIncompatibleSubtype = 'incompatible-subtype',\n\tUnknownType = 'unknown-type',\n\tTargetVersionTooNew = 'target-version-too-new',\n\tTargetVersionTooOld = 'target-version-too-old',\n\tMigrationError = 'migration-error',\n\tUnrecognizedSubtype = 'unrecognized-subtype',\n}\n"],
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}