fix(data): detect DataTable structurally so Data() works under tsx/cjs (#5641)

[DavertMik]

Fixes #5641

Problem

Data(table).Scenario(...) throws Invalid data type. Data accepts either: DataTable || generator || Array || function for a perfectly valid DataTable after migrating to 4.x. It works in 3.x.

import { dataTable as DataTable } from 'codeceptjs';

const cases = new DataTable(['input', 'expected']);
cases.add(['input1', 'expected1']);

Data(cases).Scenario('test something', ({ current }) => { /* ... */ });

Root cause

The check in lib/data/context.js is identity-based:

if (dataTable instanceof DataTable) { return dataTable.rows }

In a 4.x project configured with require: ['tsx/cjs'], the test file is transpiled to CommonJS, so import { dataTable } from 'codeceptjs' resolves through tsx's loader and the test gets its own copy of the DataTable class. The framework runs as ESM with a different DataTable class. So cases instanceof DataTable is false even though cases is a genuine DataTable, and the throw fires.

This worked in 3.x because everything was CommonJS — a single module registry and a single class. It's the same dual-module loading hazard behind #5632 / #5635.

Fix

Detect a DataTable structurally in addition to instanceof, which survives duplicate module instances:

function isDataTable(dataTable) {
  if (dataTable instanceof DataTable) return true
  return Boolean(dataTable) && Array.isArray(dataTable.array) && Array.isArray(dataTable.rows) && typeof dataTable.add === 'function'
}

The duck-type can't collide with the other accepted inputs — plain arrays, generators and functions all fail it and fall through to their existing branches, so behavior is otherwise unchanged.

Verification

• Reproduced the exact failure (identical stack trace) against the tsx/cjs fixture, then confirmed all data rows run after the fix.
• Added a regression unit test in test/unit/data/ui_test.js that feeds Data() a DataTable from a different class identity (simulating the tsx/cjs hazard without needing tsx).
• All data unit tests pass.

🤖 Generated with Claude Code