Created
December 24, 2022 11:21
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| const getType = (x: any) => Object.prototype.toString.call(x).slice(8, -1); | |
| // prettier-ignore | |
| const primitiveTypes = ["Number", "String", "Boolean", "Null", "BigInt", 'Symbol', 'Undefined']; | |
| const isPrimitiveType = (x: any) => primitiveTypes.includes(getType(x)); | |
| export const getCopy = (x: any) => { | |
| if (isPrimitiveType(x)) { | |
| return x; | |
| } | |
| const bank = new WeakMap(); | |
| const getScoppedCopy = (x: any) => { | |
| if (isPrimitiveType(x)) { | |
| return x; | |
| } | |
| if (Array.isArray(x)) { | |
| if (!bank.has(x)) { | |
| const array = []; | |
| for (const item of x) { | |
| array.push(getScoppedCopy(item)); | |
| } | |
| bank.set(x, array); | |
| } | |
| return bank.get(x); | |
| } | |
| const type = getType(x); | |
| if (type === "Map") { | |
| if (!bank.has(x)) { | |
| const map = new Map(); | |
| for (const [key, value] of x.entries()) { | |
| map.set(key, getCopy(value)); | |
| } | |
| bank.set(x, map); | |
| } | |
| return bank.get(x); | |
| } | |
| if (type === "Set") { | |
| if (!bank.has(x)) { | |
| const set = new Set(); | |
| for (const value of x.values()) { | |
| set.add(getCopy(value)); | |
| } | |
| bank.set(x, set); | |
| } | |
| return bank.get(x); | |
| } | |
| if (type === "Object") { | |
| if (!bank.has(x)) { | |
| const obj = {} as { [key: string]: any }; | |
| for (const [key, value] of Object.entries(x)) { | |
| obj[key] = getScoppedCopy(value); | |
| } | |
| bank.set(x, obj); | |
| } | |
| return bank.get(x); | |
| } | |
| const proto = Object.getPrototypeOf(x); | |
| if (proto && proto?.constructor) { | |
| if (!bank.has(x)) { | |
| bank.set(x, new proto.constructor(x)); | |
| } | |
| return bank.get(x); | |
| } | |
| throw new Error(`Unkown type "${type}"`); | |
| }; | |
| return getScoppedCopy(x); | |
| }; |
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