@sanity/import/dist/util/ensureUniqueIds.js

Import documents to a Sanity dataset

export function ensureUniqueIds(documents) {
    const seen = [];
    const duplicates = [];
    for (const doc of documents){
        if (!doc._id) {
            continue;
        }
        if (seen.includes(doc._id)) {
            duplicates.push(doc._id);
        } else {
            seen.push(doc._id);
        }
    }
    const numDupes = duplicates.length;
    if (numDupes === 0) {
        return;
    }
    throw new Error(`Found ${numDupes} duplicate IDs in the source file:\n- ${duplicates.join('\n- ')}`);
}

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