@cmpd/tlschema

This package houses type definitions, schema migrations, and other type metadata for the tldraw editor's default persisted data.

There are three main kinds of types:

• Record types

  These are root record types added to the Store class. They are defined in the ./src/records directory.

• Shape types

  These are subtypes of the root TLShape record type. They allow specifying a unique name and custom props for a particular kind of shape.

• Asset types

  These are subtypes of the root TLAsset record type. They allow specifying a unique name and custom props for a particular kind of asset.

Adding migrations

If you make any kind of change to any persisted data shape in this package, you must add migrations that are able to convert old versions to new versions, and vice-versa.

If you are making a change that affects the structure of a record, shape, or asset, update the migrations in the same file as the record, shape, or asset is defined.

If you are making a change that affects the structure of the store (e.g. renaming or deleting a type, consolidating two shape types into one, etc), add your changes in the migrations in schema.ts.

After making your changes, add a new version number, using a meaninful name. For example, if you add a new property to the TLShape type called ownerId that points to a user, you might do this:

In TLShape.ts

 const Versions = {
   RemoveSomeProp: 1,
+  AddOwnerId: 2,
 } as const

and then in the TLShape type

   x: number
   y: number
+  ownerId: ID<TLUser> | null
   props: Props
   parentId: ID<TLShape> | ID<TLPage>

and then adding a migration:

 export const shapeTypeMigrations = defineMigrations({
   currentVersion: Versions.Initial,
   firstVersion: Versions.Initial,
   migrators: {
+    [Versions.AddOwnerId]: {
+      // add ownerId property
+      up: (shape) => ({...shape, ownerId: null}),
+      // remove ownerId property
+      down: ({ownerId, ...shape}) => shape,
+    }
   },

After you've added your migration, make sure to add a test for it in src/migrations.test.ts. It will complain if you do not!

License

The source code for various apps and packages in this repository are licensed under Apache-2.0. These licenses are not subject to change.