From 078fa09ff4782523cf404b5318882a4358ea5d23 Mon Sep 17 00:00:00 2001
From: upstream <upstream@localhost>
Date: Fri, 4 Sep 2026 09:22:12 +0200
Subject: [PATCH] Upstream davidmarkclements/rfdc state of the touched files
 before 38fddd8c01

---
 index.js      | 198 ++++++++++++++++++++++++++++++++
 test/index.js | 306 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 504 insertions(+)
 create mode 100644 index.js
 create mode 100644 test/index.js

diff --git a/index.js b/index.js
new file mode 100644
index 0000000..a964561
--- /dev/null
+++ b/index.js
@@ -0,0 +1,198 @@
+'use strict'
+module.exports = rfdc
+
+function copyBuffer (cur) {
+  if (cur instanceof Buffer) {
+    return Buffer.from(cur)
+  }
+
+  return new cur.constructor(cur.buffer.slice(), cur.byteOffset, cur.length)
+}
+
+function rfdc (opts) {
+  opts = opts || {}
+  if (opts.circles) return rfdcCircles(opts)
+
+  const constructorHandlers = new Map()
+  constructorHandlers.set(Date, (o) => new Date(o))
+  constructorHandlers.set(Map, (o, fn) => new Map(cloneArray(Array.from(o), fn)))
+  constructorHandlers.set(Set, (o, fn) => new Set(cloneArray(Array.from(o), fn)))
+  if (opts.constructorHandlers) {
+    for (const handler of opts.constructorHandlers) {
+      constructorHandlers.set(handler[0], handler[1])
+    }
+  }
+
+  let handler = null
+
+  return opts.proto ? cloneProto : clone
+
+  function cloneArray (a, fn) {
+    const keys = Object.keys(a)
+    const a2 = new Array(keys.length)
+    for (let i = 0; i < keys.length; i++) {
+      const k = keys[i]
+      const cur = a[k]
+      if (typeof cur !== 'object' || cur === null) {
+        a2[k] = cur
+      } else if (cur.constructor !== Object && (handler = constructorHandlers.get(cur.constructor))) {
+        a2[k] = handler(cur, fn)
+      } else if (ArrayBuffer.isView(cur)) {
+        a2[k] = copyBuffer(cur)
+      } else {
+        a2[k] = fn(cur)
+      }
+    }
+    return a2
+  }
+
+  function clone (o) {
+    if (typeof o !== 'object' || o === null) return o
+    if (Array.isArray(o)) return cloneArray(o, clone)
+    if (o.constructor !== Object && (handler = constructorHandlers.get(o.constructor))) {
+      return handler(o, clone)
+    }
+    const o2 = {}
+    for (const k in o) {
+      if (Object.hasOwnProperty.call(o, k) === false) continue
+      const cur = o[k]
+      if (typeof cur !== 'object' || cur === null) {
+        o2[k] = cur
+      } else if (cur.constructor !== Object && (handler = constructorHandlers.get(cur.constructor))) {
+        o2[k] = handler(cur, clone)
+      } else if (ArrayBuffer.isView(cur)) {
+        o2[k] = copyBuffer(cur)
+      } else {
+        o2[k] = clone(cur)
+      }
+    }
+    return o2
+  }
+
+  function cloneProto (o) {
+    if (typeof o !== 'object' || o === null) return o
+    if (Array.isArray(o)) return cloneArray(o, cloneProto)
+    if (o.constructor !== Object && (handler = constructorHandlers.get(o.constructor))) {
+      return handler(o, cloneProto)
+    }
+    const o2 = {}
+    for (const k in o) {
+      const cur = o[k]
+      if (typeof cur !== 'object' || cur === null) {
+        o2[k] = cur
+      } else if (cur.constructor !== Object && (handler = constructorHandlers.get(cur.constructor))) {
+        o2[k] = handler(cur, cloneProto)
+      } else if (ArrayBuffer.isView(cur)) {
+        o2[k] = copyBuffer(cur)
+      } else {
+        o2[k] = cloneProto(cur)
+      }
+    }
+    return o2
+  }
+}
+
+function rfdcCircles (opts) {
+  const refs = []
+  const refsNew = []
+
+  const constructorHandlers = new Map()
+  constructorHandlers.set(Date, (o) => new Date(o))
+  constructorHandlers.set(Map, (o, fn) => new Map(cloneArray(Array.from(o), fn)))
+  constructorHandlers.set(Set, (o, fn) => new Set(cloneArray(Array.from(o), fn)))
+  if (opts.constructorHandlers) {
+    for (const handler of opts.constructorHandlers) {
+      constructorHandlers.set(handler[0], handler[1])
+    }
+  }
+
+  let handler = null
+  return opts.proto ? cloneProto : clone
+
+  function cloneArray (a, fn) {
+    const keys = Object.keys(a)
+    const a2 = new Array(keys.length)
+    for (let i = 0; i < keys.length; i++) {
+      const k = keys[i]
+      const cur = a[k]
+      if (typeof cur !== 'object' || cur === null) {
+        a2[k] = cur
+      } else if (cur.constructor !== Object && (handler = constructorHandlers.get(cur.constructor))) {
+        a2[k] = handler(cur, fn)
+      } else if (ArrayBuffer.isView(cur)) {
+        a2[k] = copyBuffer(cur)
+      } else {
+        const index = refs.indexOf(cur)
+        if (index !== -1) {
+          a2[k] = refsNew[index]
+        } else {
+          a2[k] = fn(cur)
+        }
+      }
+    }
+    return a2
+  }
+
+  function clone (o) {
+    if (typeof o !== 'object' || o === null) return o
+    if (Array.isArray(o)) return cloneArray(o, clone)
+    if (o.constructor !== Object && (handler = constructorHandlers.get(o.constructor))) {
+      return handler(o, clone)
+    }
+    const o2 = {}
+    refs.push(o)
+    refsNew.push(o2)
+    for (const k in o) {
+      if (Object.hasOwnProperty.call(o, k) === false) continue
+      const cur = o[k]
+      if (typeof cur !== 'object' || cur === null) {
+        o2[k] = cur
+      } else if (cur.constructor !== Object && (handler = constructorHandlers.get(cur.constructor))) {
+        o2[k] = handler(cur, clone)
+      } else if (ArrayBuffer.isView(cur)) {
+        o2[k] = copyBuffer(cur)
+      } else {
+        const i = refs.indexOf(cur)
+        if (i !== -1) {
+          o2[k] = refsNew[i]
+        } else {
+          o2[k] = clone(cur)
+        }
+      }
+    }
+    refs.pop()
+    refsNew.pop()
+    return o2
+  }
+
+  function cloneProto (o) {
+    if (typeof o !== 'object' || o === null) return o
+    if (Array.isArray(o)) return cloneArray(o, cloneProto)
+    if (o.constructor !== Object && (handler = constructorHandlers.get(o.constructor))) {
+      return handler(o, cloneProto)
+    }
+    const o2 = {}
+    refs.push(o)
+    refsNew.push(o2)
+    for (const k in o) {
+      const cur = o[k]
+      if (typeof cur !== 'object' || cur === null) {
+        o2[k] = cur
+      } else if (cur.constructor !== Object && (handler = constructorHandlers.get(cur.constructor))) {
+        o2[k] = handler(cur, cloneProto)
+      } else if (ArrayBuffer.isView(cur)) {
+        o2[k] = copyBuffer(cur)
+      } else {
+        const i = refs.indexOf(cur)
+        if (i !== -1) {
+          o2[k] = refsNew[i]
+        } else {
+          o2[k] = cloneProto(cur)
+        }
+      }
+    }
+    refs.pop()
+    refsNew.pop()
+    return o2
+  }
+}
diff --git a/test/index.js b/test/index.js
new file mode 100644
index 0000000..5bdd9ac
--- /dev/null
+++ b/test/index.js
@@ -0,0 +1,306 @@
+'use strict'
+
+const { test } = require('tap')
+const rfdc = require('..')
+const cloneDefault = require('../default')
+const clone = rfdc()
+const cloneProto = rfdc({ proto: true })
+const cloneCircles = rfdc({ circles: true })
+const cloneCirclesProto = rfdc({ circles: true, proto: true })
+
+const rnd = (max) => Math.round(Math.random() * max)
+
+types(clone, 'default')
+types(cloneProto, 'proto option')
+types(cloneCircles, 'circles option')
+types(cloneCirclesProto, 'circles and proto option')
+
+test('default – does not copy proto properties', async ({ is }) => {
+  is(clone(Object.create({ a: 1 })).a, undefined, 'value not copied')
+})
+test('default – shorthand import', async ({ same }) => {
+  same(
+    clone(Object.create({ a: 1 })),
+    cloneDefault(Object.create({ a: 1 })),
+    'import equals clone with default options'
+  )
+})
+test('proto option – copies enumerable proto properties', async ({ is }) => {
+  is(cloneProto(Object.create({ a: 1 })).a, 1, 'value copied')
+})
+test('circles option - circular object', async ({ same, is, isNot }) => {
+  const o = { nest: { a: 1, b: 2 } }
+  o.circular = o
+  same(cloneCircles(o), o, 'same values')
+  isNot(cloneCircles(o), o, 'different objects')
+  isNot(cloneCircles(o).nest, o.nest, 'different nested objects')
+  const c = cloneCircles(o)
+  is(c.circular, c, 'circular references point to copied parent')
+  isNot(c.circular, o, 'circular references do not point to original parent')
+})
+test('circles option – deep circular object', async ({ same, is, isNot }) => {
+  const o = { nest: { a: 1, b: 2 } }
+  o.nest.circular = o
+  same(cloneCircles(o), o, 'same values')
+  isNot(cloneCircles(o), o, 'different objects')
+  isNot(cloneCircles(o).nest, o.nest, 'different nested objects')
+  const c = cloneCircles(o)
+  is(c.nest.circular, c, 'circular references point to copied parent')
+  isNot(
+    c.nest.circular,
+    o,
+    'circular references do not point to original parent'
+  )
+})
+test('circles option alone – does not copy proto properties', async ({
+  is
+}) => {
+  is(cloneCircles(Object.create({ a: 1 })).a, undefined, 'value not copied')
+})
+test('circles and proto option – copies enumerable proto properties', async ({
+  is
+}) => {
+  is(cloneCirclesProto(Object.create({ a: 1 })).a, 1, 'value copied')
+})
+test('circles and proto option - circular object', async ({
+  same,
+  is,
+  isNot
+}) => {
+  const o = { nest: { a: 1, b: 2 } }
+  o.circular = o
+  same(cloneCirclesProto(o), o, 'same values')
+  isNot(cloneCirclesProto(o), o, 'different objects')
+  isNot(cloneCirclesProto(o).nest, o.nest, 'different nested objects')
+  const c = cloneCirclesProto(o)
+  is(c.circular, c, 'circular references point to copied parent')
+  isNot(c.circular, o, 'circular references do not point to original parent')
+})
+test('circles and proto option – deep circular object', async ({
+  same,
+  is,
+  isNot
+}) => {
+  const o = { nest: { a: 1, b: 2 } }
+  o.nest.circular = o
+  same(cloneCirclesProto(o), o, 'same values')
+  isNot(cloneCirclesProto(o), o, 'different objects')
+  isNot(cloneCirclesProto(o).nest, o.nest, 'different nested objects')
+  const c = cloneCirclesProto(o)
+  is(c.nest.circular, c, 'circular references point to copied parent')
+  isNot(
+    c.nest.circular,
+    o,
+    'circular references do not point to original parent'
+  )
+})
+test('circles and proto option – deep circular array', async ({
+  same,
+  is,
+  isNot
+}) => {
+  const o = { nest: [1, 2] }
+  o.nest.push(o)
+  same(cloneCirclesProto(o), o, 'same values')
+  isNot(cloneCirclesProto(o), o, 'different objects')
+  isNot(cloneCirclesProto(o).nest, o.nest, 'different nested objects')
+  const c = cloneCirclesProto(o)
+  is(c.nest[2], c, 'circular references point to copied parent')
+  isNot(c.nest[2], o, 'circular references do not point to original parent')
+})
+test('custom constructor handler', async ({ same, ok, isNot }) => {
+  class Foo {
+    constructor (s) {
+      this.s = s
+    }
+  }
+  const data = { foo: new Foo('foo') }
+  const cloned = rfdc({ constructorHandlers: [[Foo, (o) => new Foo(o.s)]] })(data)
+  ok(cloned.foo instanceof Foo)
+  same(cloned.foo.s, data.foo.s, 'same values')
+  isNot(cloned.foo, data.foo, 'different objects')
+})
+test('custom RegExp handler', async ({ same, ok, isNot }) => {
+  const data = { regex: /foo/ }
+  const cloned = rfdc({ constructorHandlers: [[RegExp, (o) => new RegExp(o)]] })(data)
+  isNot(cloned.regex, data.regex, 'different objects')
+  ok(cloned.regex.test('foo'))
+})
+
+function types (clone, label) {
+  test(label + ' – number', async ({ is }) => {
+    is(clone(42), 42, 'same value')
+  })
+  test(label + ' – string', async ({ is }) => {
+    is(clone('str'), 'str', 'same value')
+  })
+  test(label + ' – boolean', async ({ is }) => {
+    is(clone(true), true, 'same value')
+  })
+  test(label + ' – function', async ({ is }) => {
+    const fn = () => {}
+    is(clone(fn), fn, 'same function')
+  })
+  test(label + ' – async function', async ({ is }) => {
+    const fn = async () => {}
+    is(clone(fn), fn, 'same function')
+  })
+  test(label + ' – generator function', async ({ is }) => {
+    const fn = function * () {}
+    is(clone(fn), fn, 'same function')
+  })
+  test(label + ' – date', async ({ is, isNot }) => {
+    const date = new Date()
+    is(+clone(date), +date, 'same value')
+    isNot(clone(date), date, 'different object')
+  })
+  test(label + ' – null', async ({ is }) => {
+    is(clone(null), null, 'same value')
+  })
+  test(label + ' – shallow object', async ({ same, isNot }) => {
+    const o = { a: 1, b: 2 }
+    same(clone(o), o, 'same values')
+    isNot(clone(o), o, 'different object')
+  })
+  test(label + ' – shallow array', async ({ same, isNot }) => {
+    const o = [1, 2]
+    same(clone(o), o, 'same values')
+    isNot(clone(o), o, 'different arrays')
+  })
+  test(label + ' – deep object', async ({ same, isNot }) => {
+    const o = { nest: { a: 1, b: 2 } }
+    same(clone(o), o, 'same values')
+    isNot(clone(o), o, 'different objects')
+    isNot(clone(o).nest, o.nest, 'different nested objects')
+  })
+  test(label + ' – deep array', async ({ same, isNot }) => {
+    const o = [{ a: 1, b: 2 }, [3]]
+    same(clone(o), o, 'same values')
+    isNot(clone(o), o, 'different arrays')
+    isNot(clone(o)[0], o[0], 'different array elements')
+    isNot(clone(o)[1], o[1], 'different array elements')
+  })
+  test(label + ' – nested number', async ({ is }) => {
+    is(clone({ a: 1 }).a, 1, 'same value')
+  })
+  test(label + ' – nested string', async ({ is }) => {
+    is(clone({ s: 'str' }).s, 'str', 'same value')
+  })
+  test(label + ' – nested boolean', async ({ is }) => {
+    is(clone({ b: true }).b, true, 'same value')
+  })
+  test(label + ' – nested function', async ({ is }) => {
+    const fn = () => {}
+    is(clone({ fn }).fn, fn, 'same function')
+  })
+  test(label + ' – nested async function', async ({ is }) => {
+    const fn = async () => {}
+    is(clone({ fn }).fn, fn, 'same function')
+  })
+  test(label + ' – nested generator function', async ({ is }) => {
+    const fn = function * () {}
+    is(clone({ fn }).fn, fn, 'same function')
+  })
+  test(label + ' – nested date', async ({ is, isNot }) => {
+    const date = new Date()
+    is(+clone({ d: date }).d, +date, 'same value')
+    isNot(clone({ d: date }).d, date, 'different object')
+  })
+  test(label + ' – nested date in array', async ({ is, isNot }) => {
+    const date = new Date()
+    is(+clone({ d: [date] }).d[0], +date, 'same value')
+    isNot(clone({ d: [date] }).d[0], date, 'different object')
+    is(+cloneCircles({ d: [date] }).d[0], +date, 'same value')
+    isNot(cloneCircles({ d: [date] }).d, date, 'different object')
+  })
+  test(label + ' – nested null', async ({ is }) => {
+    is(clone({ n: null }).n, null, 'same value')
+  })
+  test(label + ' – arguments', async ({ isNot, same }) => {
+    function fn (...args) {
+      same(clone(arguments), args, 'same values')
+      isNot(clone(arguments), arguments, 'different object')
+    }
+    fn(1, 2, 3)
+  })
+  test(`${label} copies buffers from object correctly`, async ({ ok, is, isNot }) => {
+    const input = Date.now().toString(36)
+    const inputBuffer = Buffer.from(input)
+    const clonedBuffer = clone({ a: inputBuffer }).a
+    ok(Buffer.isBuffer(clonedBuffer), 'cloned value is buffer')
+    isNot(clonedBuffer, inputBuffer, 'cloned buffer is not same as input buffer')
+    is(clonedBuffer.toString(), input, 'cloned buffer content is correct')
+  })
+  test(`${label} copies buffers from arrays correctly`, async ({ ok, is, isNot }) => {
+    const input = Date.now().toString(36)
+    const inputBuffer = Buffer.from(input)
+    const [clonedBuffer] = clone([inputBuffer])
+    ok(Buffer.isBuffer(clonedBuffer), 'cloned value is buffer')
+    isNot(clonedBuffer, inputBuffer, 'cloned buffer is not same as input buffer')
+    is(clonedBuffer.toString(), input, 'cloned buffer content is correct')
+  })
+  test(`${label} copies TypedArrays from object correctly`, async ({ ok, is, isNot }) => {
+    const [input1, input2] = [rnd(10), rnd(10)]
+    const buffer = new ArrayBuffer(8)
+    const int32View = new Int32Array(buffer)
+    int32View[0] = input1
+    int32View[1] = input2
+    const cloned = clone({ a: int32View }).a
+    ok(cloned instanceof Int32Array, 'cloned value is instance of class')
+    isNot(cloned, int32View, 'cloned value is not same as input value')
+    is(cloned[0], input1, 'cloned value content is correct')
+    is(cloned[1], input2, 'cloned value content is correct')
+  })
+  test(`${label} copies TypedArrays from array correctly`, async ({ ok, is, isNot }) => {
+    const [input1, input2] = [rnd(10), rnd(10)]
+    const buffer = new ArrayBuffer(16)
+    const int32View = new Int32Array(buffer)
+    int32View[0] = input1
+    int32View[1] = input2
+    const [cloned] = clone([int32View])
+    ok(cloned instanceof Int32Array, 'cloned value is instance of class')
+    isNot(cloned, int32View, 'cloned value is not same as input value')
+    is(cloned[0], input1, 'cloned value content is correct')
+    is(cloned[1], input2, 'cloned value content is correct')
+  })
+  test(`${label} copies complex TypedArrays`, async ({ ok, deepEqual, is, isNot }) => {
+    const [input1, input2, input3] = [rnd(10), rnd(10), rnd(10)]
+    const buffer = new ArrayBuffer(4)
+    const view1 = new Int8Array(buffer, 0, 2)
+    const view2 = new Int8Array(buffer, 2, 2)
+    const view3 = new Int8Array(buffer)
+    view1[0] = input1
+    view2[0] = input2
+    view3[3] = input3
+    const cloned = clone({ view1, view2, view3 })
+    ok(cloned.view1 instanceof Int8Array, 'cloned value is instance of class')
+    ok(cloned.view2 instanceof Int8Array, 'cloned value is instance of class')
+    ok(cloned.view3 instanceof Int8Array, 'cloned value is instance of class')
+    isNot(cloned.view1, view1, 'cloned value is not same as input value')
+    isNot(cloned.view2, view2, 'cloned value is not same as input value')
+    isNot(cloned.view3, view3, 'cloned value is not same as input value')
+    deepEqual(Array.from(cloned.view1), [input1, 0], 'cloned value content is correct')
+    deepEqual(Array.from(cloned.view2), [input2, input3], 'cloned value content is correct')
+    deepEqual(Array.from(cloned.view3), [input1, 0, input2, input3], 'cloned value content is correct')
+  })
+  test(`${label} - maps`, async ({ same, isNot }) => {
+    const map = new Map([['a', 1]])
+    same(Array.from(clone(map)), [['a', 1]], 'same value')
+    isNot(clone(map), map, 'different object')
+  })
+  test(`${label} - sets`, async ({ same, isNot }) => {
+    const set = new Set([1])
+    same(Array.from(clone(set)), [1])
+    isNot(clone(set), set, 'different object')
+  })
+  test(`${label} - nested maps`, async ({ same, isNot }) => {
+    const data = { m: new Map([['a', 1]]) }
+    same(Array.from(clone(data).m), [['a', 1]], 'same value')
+    isNot(clone(data).m, data.m, 'different object')
+  })
+  test(`${label} - nested sets`, async ({ same, isNot }) => {
+    const data = { s: new Set([1]) }
+    same(Array.from(clone(data).s), [1], 'same value')
+    isNot(clone(data).s, data.s, 'different object')
+  })
+}