bare-operating-system/packages/bare-os-booter/scripts/bare-node-test-shim.cjs

/**
 * Preload for `brittle-node` / Node-based booter tests:
 * - `bare-type/binding.js` uses Bare-only `require.addon()`.
 * - `bare-inspect` pulls the same; brittle → bare-assert → bare-inspect.
 *
 * Usage: node --require ./scripts/bare-node-test-shim.cjs …
 */
'use strict'

const path = require('path')
const Module = require('module')
const { types } = require('node:util')

const constants = {
  UNDEFINED: 0,
  NULL: 1,
  BOOLEAN: 2,
  NUMBER: 3,
  STRING: 4,
  SYMBOL: 5,
  OBJECT: 6,
  FUNCTION: 7,
  EXTERNAL: 8,
  BIGINT: 9,
  INT32: 256,
  UINT32: 512,
  ARRAY: 256,
  ARGUMENTS: 512,
  DATE: 768,
  REGEXP: 1024,
  ERROR: 1280,
  PROMISE: 1536,
  PROXY: 1792,
  GENERATOR: 2048,
  MAP: 2304,
  SET: 2560,
  WEAK_MAP: 2816,
  WEAK_SET: 3072,
  WEAK_REF: 3328,
  ARRAYBUFFER: 3584,
  SHAREDARRAYBUFFER: 3840,
  TYPEDARRAY: 4096,
  DATAVIEW: 4352,
  MODULE_NAMESPACE: 4608,
  INT8ARRAY: 65536,
  UINT8ARRAY: 131072,
  UINT8CLAMPEDARRAY: 196608,
  INT16ARRAY: 262144,
  UINT16ARRAY: 327680,
  INT32ARRAY: 393216,
  UINT32ARRAY: 458752,
  FLOAT16ARRAY: 786432,
  FLOAT32ARRAY: 524288,
  FLOAT64ARRAY: 589824,
  BIGINT64ARRAY: 655360,
  BIGUINT64ARRAY: 720896,
  ASYNC_FUNCTION: 256,
  GENERATOR_FUNCTION: 512
}

const t = constants

function typeNumber(value) {
  let ty = t.NUMBER
  if (Number.isSafeInteger(value)) {
    if (value >= -0x80000000 && value <= 0x7fffffff && (value | 0) === value) {
      ty |= t.INT32
    } else if (value >= 0 && value <= 0xffffffff && (value >>> 0) === value) {
      ty |= t.UINT32
    }
  }
  return ty
}

function typeObject(value) {
  if (value === null) return t.NULL
  if (Array.isArray(value)) return t.OBJECT | t.ARRAY
  if (types.isArgumentsObject(value)) return t.OBJECT | t.ARGUMENTS
  if (value instanceof Date) return t.OBJECT | t.DATE
  if (value instanceof RegExp) return t.OBJECT | t.REGEXP
  if (types.isNativeError(value)) return t.OBJECT | t.ERROR
  if (value instanceof Promise) return t.OBJECT | t.PROMISE
  if (types.isProxy(value)) return t.OBJECT | t.PROXY
  if (types.isGeneratorObject(value)) return t.OBJECT | t.GENERATOR
  if (value instanceof Map) return t.OBJECT | t.MAP
  if (value instanceof Set) return t.OBJECT | t.SET
  if (value instanceof WeakMap) return t.OBJECT | t.WEAK_MAP
  if (value instanceof WeakSet) return t.OBJECT | t.WEAK_SET
  if (value instanceof WeakRef) return t.OBJECT | t.WEAK_REF
  if (value instanceof ArrayBuffer) return t.OBJECT | t.ARRAYBUFFER
  if (value instanceof SharedArrayBuffer) return t.OBJECT | t.SHAREDARRAYBUFFER
  if (ArrayBuffer.isView(value) && !(value instanceof DataView)) {
    let ta = t.OBJECT | t.TYPEDARRAY
    if (value instanceof Int8Array) ta |= t.INT8ARRAY
    else if (value instanceof Uint8Array) ta |= t.UINT8ARRAY
    else if (value instanceof Uint8ClampedArray) ta |= t.UINT8CLAMPEDARRAY
    else if (value instanceof Int16Array) ta |= t.INT16ARRAY
    else if (value instanceof Uint16Array) ta |= t.UINT16ARRAY
    else if (value instanceof Int32Array) ta |= t.INT32ARRAY
    else if (value instanceof Uint32Array) ta |= t.UINT32ARRAY
    else if (typeof Float16Array !== 'undefined' && value instanceof Float16Array)
      ta |= t.FLOAT16ARRAY
    else if (value instanceof Float32Array) ta |= t.FLOAT32ARRAY
    else if (value instanceof Float64Array) ta |= t.FLOAT64ARRAY
    else if (value instanceof BigInt64Array) ta |= t.BIGINT64ARRAY
    else if (value instanceof BigUint64Array) ta |= t.BIGUINT64ARRAY
    return ta
  }
  if (value instanceof DataView) return t.OBJECT | t.DATAVIEW
  if (types.isModuleNamespaceObject(value)) return t.OBJECT | t.MODULE_NAMESPACE
  return t.OBJECT
}

function typeFunction(fn) {
  let ty = t.FUNCTION
  if (types.isAsyncFunction(fn)) ty |= t.ASYNC_FUNCTION
  if (types.isGeneratorFunction(fn)) ty |= t.GENERATOR_FUNCTION
  return ty
}

function bareType(value) {
  switch (typeof value) {
    case 'undefined':
      return t.UNDEFINED
    case 'boolean':
      return t.BOOLEAN
    case 'number':
      return typeNumber(value)
    case 'string':
      return t.STRING
    case 'symbol':
      return t.SYMBOL
    case 'object':
      return typeObject(value)
    case 'function':
      return typeFunction(value)
    case 'bigint':
      return t.BIGINT
    default:
      return t.UNDEFINED
  }
}

const bareTypeBinding = {
  constants,
  type: bareType,
  addTag() {},
  checkTag() {
    return false
  }
}

/** @param {string} filename */
function isBareInspectIndex(filename) {
  const n = filename.replace(/\\/g, '/')
  return n.includes('/bare-inspect/') && n.endsWith('/index.js')
}

const BARE_INSPECT_NODE_SOURCE = `'use strict'
const util = require('util')
module.exports = function inspect(value, opts = {}) {
  return util.inspect(value, {
    depth: opts.depth,
    colors: !!opts.colors,
    breakLength: opts.breakLength,
    maxArrayLength: opts.maxArrayLength,
    maxStringLength: opts.maxStringLength
  })
}
module.exports.styles = {}
`

const origLoad = Module._load
Module._load = function (request, parent, isMain) {
  if (
    request === './binding' &&
    parent &&
    typeof parent.filename === 'string' &&
    parent.filename.includes(`${path.sep}bare-type${path.sep}`) &&
    parent.filename.endsWith(`${path.sep}index.js`)
  ) {
    return bareTypeBinding
  }
  return origLoad.apply(this, arguments)
}

const origCompile = Module.prototype._compile
Module.prototype._compile = function (content, filename) {
  if (typeof filename === 'string' && isBareInspectIndex(filename)) {
    return origCompile.call(this, BARE_INSPECT_NODE_SOURCE, filename)
  }
  return origCompile.call(this, content, filename)
}