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Invalid entry inside getStaticPath's return value

InvalidGetStaticPathsEntry: Invalid entry returned by getStaticPaths. Expected an object, got ENTRY_TYPE

What went wrong?

getStaticPaths’s return value must be an array of objects. In most cases, this error happens because an array of array was returned. Using .flatMap() or a .flat() call may be useful.

pages/blog/[id].astro
export async function getStaticPaths() {
  return [ // <-- Array
    { params: { slug: "blog" } }, // <-- Object
    { params: { slug: "about" } }
  ];
}

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