allow set Property not same as index type for object and array

[bluelovers]

Search Terms

Suggestion

allow set Property not same as index type for object and array

Error:(6, 2) TS2411: Property ''$$'' of type 'T' is not assignable to string index type 'ITrieNode1'.
Error:(11, 2) TS2411: Property ''$$'' of type 'T' is not assignable to string index type 'ITrieNode2'.
Error:(22, 2) TS2412: Property '0' of type 'true' is not assignable to numeric index type 'string'.

export interface ITrieNode1<T = number>
{
	[k: string]: ITrieNode1<T>,

	'$$'?: T,
}

export interface ITrieNode2<T = number> extends _ITrieNode<T>
{
	[k: string]: ITrieNode2<T>,
}

export interface _ITrieNode<T = number>
{
	'$$'?: T,
}

export interface IArrayOnlyFirstIsBool
{
	[index: number]: string;
	0: true;
}

Use Cases

for only wanna special property has other type

Examples

Checklist

My suggestion meets these guidelines:

• This wouldn't be a breaking change in existing TypeScript / JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. new expression-level syntax)

[mhegazy]

Duplicate of #17867

[typescript-bot]

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.