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Extending nested arrays suddenly stopped working #54983
Description
Bug Report
🔎 Search Terms
nested array
🕗 Version & Regression Information
- This changed between versions
4.3.5and4.4.2
⏯ Playground Link
Failing playground
Correct playground
💻 Code
interface ChartState {
labels: string[];
datasets: [
{
label: string;
backgroundColor: string[] | string;
hoverBackgroundColor: string[] | string;
data: (string|number)[];
}
];
}
type _dataSetType = ChartState['datasets'][0];
type _barChartDataSetType = _dataSetType & {
barThickness: number;
}
export type BarCharState = ChartState & {
datasets: Array<_barChartDataSetType>
}
const test: BarCharState = {
labels: ['foo', 'bar'],
datasets: [
{
label: 'foo',
backgroundColor: '#fefefe',
hoverBackgroundColor: '#ffffff',
data: ['a', 'b'],
barThickness: 3,
},
]
}🙁 Actual behavior
It does not correctly merge the two types
🙂 Expected behavior
The resulting type displays incorrect behavior
Activity
geoffreytools commentedon Jul 14, 2023
It could be a bug related to this issue but
ChartState/datasetsshould be defined as an array. This intersection between a tuple and an array does not make much sense and is best avoided.RyanCavanaugh commentedon Jul 20, 2023
It really seems like you wrote
[T]thinking it meantT[]. This works as expected:typescript-bot commentedon Jul 23, 2023
This issue has been marked as "Working as Intended" and has seen no recent activity. It has been automatically closed for house-keeping purposes.