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ArraySetLength.ts

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export function __TS__ArraySetLength<T>(this: T[], length: number): number {

if (

length < 0 ||

length !== length || // NaN

length === Infinity || // Infinity

Math.floor(length) !== length

) {

// non-integer

throw `invalid array length: ${length}`;

}

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

this[i - 1] = undefined!;

}

return length;

}