Getting all rune pages

const runePages = await client.request("get", "/lol-perks/v1/pages");

Creating a new rune page

await client.request("post", "/lol-perks/v1/pages", {
    body: {
        name: "A new rune page",
        primaryStyleId: 8300,
        subStyleId: 8200,
        selectedPerkIds: [8369, 8313, 8345, 8347, 8236, 8226, 5008, 5008, 5003],
        current: true // Selects the rune page in the League client if true
    } as any // Only these five properties are required, but because of the way the auto-generated types work, TypeScript doesn't know that :(
});

Deleting a rune page

await client.request("delete", "/lol-perks/v1/pages/{id}", {
    path: {
        id: "123"
    }
})

Replacing a rune page

While there is an endpoint that replaces a specific rune page, I wouldn't recommend using it, because it doesn't show the changes in the League client. Instead delete the target rune page by it's id and create a new one.