isolatedDeclaration emits excess parentheses in union types #3916
Description
While not technically wrong, it might be unexpected? Not a dealbreaker, it just came up when I was running a comparison between ts.transpileDeclaration and this.
> require('oxc-transform').isolatedDeclaration("hello.ts", `export function foo(): number | undefined {}`)
{
sourceText: 'export declare function foo(): ((number) | (undefined));\n',
errors: []
}
> require('oxc-transform').isolatedDeclaration("hello.ts", `export const foo: number | undefined = 42`)
{
sourceText: 'export declare const foo: ((number) | (undefined));\n',
errors: []
}
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