Export DB throw error.

[portguas]

I'm using absurd-sql in electron.
I export the db like this.

try {
      const db = await getInstance()
      const data = db.export()
      const blob = new Blob([data], { type: 'application/octet-stream' })
      const blobHref = URL.createObjectURL(blob)

      self.postMessage({ action: 'exportedDB', blobHref })
    } catch (error) {
      console.info('sql export error, return ', error)
    }

It got error.

sql export error, return  TypeError: Cannot read properties of undefined (reading 'constructor')
    at readChunks (indexeddb-backend.js:65:20)
    at File.read (indexeddb-backend.js:248:22)
    at Object.read (index.js:101:37)
    at Object.read (sql-wasm.js:151:211)
    at Object.readFile (sql-wasm.js:154:349)
    at c.export (sql-wasm.js:88:238)
    at self.onmessage (instance.ts?type=mod…er_file? [sm]:86:23)

The error caused by const data = db.export()
In indexeddb-backend.js ，the data in undefined.

if (chunk.data.constructor.name !== 'ArrayBuffer') {
     throw new Error('Chunk data is not an ArrayBuffer');
   }

How can i resolve it. Thanks.

[kkosteck]

This workaround worked for me - instead of using db.export() I used direct readFile function:

import SQLWasm from '@jlongster/sql.js/dist/sql-wasm-debug.wasm?url'
const DATABASE_NAME = 'db.sqlite'
SQL = await initSqlJs({ locateFile: () => SQLWasm })
let sqlFS = new SQLiteFS(SQL.FS, new IndexedDBBackend())
SQL.register_for_idb(sqlFS)

SQL.FS.mkdir('/sql')
SQL.FS.mount(sqlFS, {}, '/sql')

// I had to use 'a+' flag here, because using 'r' throws error
const data = SQL.FS.readFile(`/sql/${DATABASE_NAME}`, { encoding: 'binary', flags: 'a+' })