(drizzle) add support for custom column types

[simonflk]

Hi! 👋

Firstly, thanks for your work on this project! 🙂

Today I used patch-package to patch @powersync/drizzle-driver@0.3.0 for the project I'm working on.

I wanted to add a custom timestamp column type to map between ISO-formatted date strings and Date objects like so:

import { customType } from 'drizzle-orm/sqlite-core';

// https://orm.drizzle.team/docs/custom-types
export const sqliteTimestamp = customType<{ data: Date; driverData: string }>({
  dataType() {
    return 'text';
  },
  fromDriver(value) {
    return new Date(value);
  },
  toDriver(value) {
    return value.toISOString();
  },
});

However, I ran into an issue passing this schema to DrizzleAppSchema:

Error: Unsupported column type: SQLiteCustomColumn

Here is the diff that solved my problem:

diff --git a/node_modules/@powersync/drizzle-driver/lib/src/utils/schema.js b/node_modules/@powersync/drizzle-driver/lib/src/utils/schema.js
index 9db8abc..94e46cb 100644
--- a/node_modules/@powersync/drizzle-driver/lib/src/utils/schema.js
+++ b/node_modules/@powersync/drizzle-driver/lib/src/utils/schema.js
@@ -1,7 +1,7 @@
 import { column, Schema, Table } from '@powersync/common';
 import { entityKind, isTable } from 'drizzle-orm';
 import { CasingCache } from 'drizzle-orm/casing';
-import { getTableConfig, SQLiteBoolean, SQLiteInteger, SQLiteReal, SQLiteText, SQLiteTextJson, SQLiteTimestamp } from 'drizzle-orm/sqlite-core';
+import { getTableConfig, SQLiteBoolean, SQLiteCustomColumn, SQLiteInteger, SQLiteReal, SQLiteText, SQLiteTextJson, SQLiteTimestamp } from 'drizzle-orm/sqlite-core';
 export function toPowerSyncTable(table, options) {
     var _a, _b;
     const { columns: drizzleColumns, indexes: drizzleIndexes } = getTableConfig(table);
@@ -14,6 +14,7 @@ export function toPowerSyncTable(table, options) {
             continue;
         }
         let mappedType;
+        MapColumn:
         switch (drizzleColumn.columnType) {
             case SQLiteText[entityKind]:
             case SQLiteTextJson[entityKind]:
@@ -27,6 +28,18 @@ export function toPowerSyncTable(table, options) {
             case SQLiteReal[entityKind]:
                 mappedType = column.real;
                 break;
+            case SQLiteCustomColumn[entityKind]:
+                switch (drizzleColumn.sqlName) {
+                    case 'text':
+                        mappedType = column.text;
+                        break MapColumn;
+                    case 'integer':
+                        mappedType = column.integer;
+                        break MapColumn;
+                    case 'real':
+                        mappedType = column.real;
+                        break MapColumn;
+                }
             default:
                 throw new Error(`Unsupported column type: ${drizzleColumn.columnType}`);
         }

This issue body was partially generated by patch-package.

[Chriztiaan]

Hey @simonflk, thanks for this! I'll give it a look over and see if I can get it into main in the next day or so.

[Chriztiaan]

Hey @simonflk, I made a minor change - just for sanity could you verify this works for @powersync/drizzle-driver@0.0.0-dev-20250120081439?

[simonflk]

Thank you @Chriztiaan

I just tested this version, and it's working for me