ArkType mutates original input?

I was always under the assumption that ArkType leaves the original input intact. However:

import { type } from "arktype";

const original = { value: "100" };
const Parser = type({ value: type("string").pipe(BigInt) });
Parser.assert(original);
console.log(original);

import { type } from "arktype";

const original = { value: "100" };
const Parser = type({ value: type("string").pipe(BigInt) });
Parser.assert(original);
console.log(original);

Outputs:

{ value: 100n }

{ value: 100n }

My assumption was that value would remain as string, and the result returned by

Parser

Parser

would be this value. But based on this, it seems like I was under the wrong assumption.

arktype•2y ago•

73 replies

SynthLuvr

ArkType mutates original input?

I was always under the assumption that ArkType leaves the original input intact. However:

import { type } from "arktype";

const original = { value: "100" };
const Parser = type({ value: type("string").pipe(BigInt) });
Parser.assert(original);
console.log(original);

import { type } from "arktype";

const original = { value: "100" };
const Parser = type({ value: type("string").pipe(BigInt) });
Parser.assert(original);
console.log(original);

Outputs:

{ value: 100n }

{ value: 100n }

My assumption was that value would remain as string, and the result returned by

Parser

Parser

would be this value. But based on this, it seems like I was under the wrong assumption.

ArkType mutates original input?

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