Code error TS1005 indicates that an ampersand is expected

My project currently utilizes TypeScript version 3.9.7 and I'm encountering an issue with the following code snippet. This code works perfectly fine in TypeScript version 4.2.3.

export namespace Abcd {
    export type AbcdOneParams = [xAxis: number, yAxis: number];
}

However, when using version 3.9.7, it throws an error saying ',' expected. IntelliJ highlights the error as TS1005: ',' expected.
code@TS Playground 4.2.3
code@TS Playground 3.9.7
I'm looking for suggestions on how to modify the code to make it compatible with version 3.9.7.

typescript

Answer №1

A tuple type labeled as 

type AbcdOneParams = [xAxis: number, yAxis: number];
is specific to TypeScript 4 and not compatible with version 3.9. To make it work in 3.9, it should be modified to:

export type AbcdOneParams = [number, number];

For further details on this functionality, feel free to check out the 4.0 release notes

Answer №2

declare namespace Abcd {
    export type AbcdParams = [string, boolean];
}

There is no need to assign keys in a tuple type.

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