Update index.ts (#3624)
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@ -64,7 +64,7 @@ export default abstract class Chart<T> {
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const keys = {
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span: -1,
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date: -1
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} as any;
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} as { [key: string]: 1 | -1; };
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if (grouped) keys.group = -1;
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this.collection.createIndex(keys, { unique: true });
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}
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