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ArrayUnshift.ts

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export function __TS__ArrayUnshift<T>(this: T[], ...items: T[]): number {

const numItemsToInsert = items.length;

if (numItemsToInsert === 0) return this.length;

for (const i of $range(this.length, 1, -1)) {

this[i + numItemsToInsert - 1] = this[i - 1];

}

for (const i of $range(1, numItemsToInsert)) {

this[i - 1] = items[i - 1];

}

return this.length;

}