33 lines
840 B
TypeScript
33 lines
840 B
TypeScript
// @target: es2020
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// @filename: a.ts
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interface BigIntIndex<E> {
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[index: bigint]: E; // should error
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}
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const arr: number[] = [1, 2, 3];
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let num: number = arr[1];
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num = arr["1"];
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num = arr[1n]; // should error
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let key: keyof any; // should be type "string | number | symbol"
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key = 123;
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key = "abc";
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key = Symbol();
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key = 123n; // should error
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// Show correct usage of bigint index: explicitly convert to string
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const bigNum: bigint = 0n;
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const typedArray = new Uint8Array(3);
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typedArray[bigNum] = 0xAA; // should error
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typedArray[String(bigNum)] = 0xAA;
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typedArray["1"] = 0xBB;
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typedArray[2] = 0xCC;
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// {1n: 123} is a syntax error; must go in separate file so BigIntIndex error is shown
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// @filename: b.ts
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// BigInt cannot be used as an object literal property
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const a = {1n: 123};
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const b = {[1n]: 456};
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const c = {[bigNum]: 789};
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