Define Index types with a specific pattern for typescript

Question

is there a way to define Index types for typescript with a specific pattern? something like all properties starting with "$" are HTMLElements. something like

[key: "^\$.+"]: HTMLElement;

Not currently possible

Titian Cernicova-Dragomir
– Titian Cernicova-Dragomir

2019-08-26 12:48:31 +00:00
Commented Aug 26, 2019 at 12:48 — Titian Cernicova-Dragomir
– Titian Cernicova-Dragomir, Commented Aug 26, 2019 at 12:48

DAG · Accepted Answer · 2019-08-26 12:53:21Z

1

No, this is currently not possible, index signatures are limited to the following:

There are two types of supported index signatures: string and number. It is possible to support both types of indexers, but the type returned from a numeric indexer must be a subtype of the type returned from the string indexer. This is because when indexing with a number, JavaScript will actually convert that to a string before indexing into an object.

There are some proposals for allowing exactly what you described, but no significant effort for an implementation has happend yet.

answered Aug 26, 2019 at 12:53

DAG

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