14 files changed, 1303 insertions, 0 deletions
diff --git a/node_modules/concordance/lib/complexValues/arguments.js b/node_modules/concordance/lib/complexValues/arguments.js
new file mode 100644
index 000000000..446407222
--- /dev/null
+++ b/node_modules/concordance/lib/complexValues/arguments.js
@@ -0,0 +1,48 @@
+'use strict'
+
+const constants = require('../constants')
+const object = require('./object')
+
+const AMBIGUOUS = constants.AMBIGUOUS
+const UNEQUAL = constants.UNEQUAL
+
+function describe (props) {
+  return new DescribedArgumentsValue(Object.assign({
+    // Treat as an array, to allow comparisons with arrays
+    isArray: true,
+    isList: true
+  }, props, { ctor: 'Arguments' }))
+}
+exports.describe = describe
+
+function deserialize (state, recursor) {
+  return new DeserializedArgumentsValue(state, recursor)
+}
+exports.deserialize = deserialize
+
+const tag = Symbol('ArgumentsValue')
+exports.tag = tag
+
+class ArgumentsValue extends object.ObjectValue {
+  compare (expected) {
+    if (expected.isComplex !== true) return UNEQUAL
+
+    // When used on the left-hand side of a comparison, argument values may be
+    // compared to arrays.
+    if (expected.stringTag === 'Array') return AMBIGUOUS
+
+    return super.compare(expected)
+  }
+}
+Object.defineProperty(ArgumentsValue.prototype, 'tag', { value: tag })
+
+const DescribedArgumentsValue = object.DescribedMixin(ArgumentsValue)
+
+class DeserializedArgumentsValue extends object.DeserializedMixin(ArgumentsValue) {
+  compare (expected) {
+    // Deserialized argument values may only be compared to argument values.
+    return expected.isComplex === true && expected.stringTag === 'Array'
+      ? UNEQUAL
+      : super.compare(expected)
+  }
+}
diff --git a/node_modules/concordance/lib/complexValues/arrayBuffer.js b/node_modules/concordance/lib/complexValues/arrayBuffer.js
new file mode 100644
index 000000000..1053b893e
--- /dev/null
+++ b/node_modules/concordance/lib/complexValues/arrayBuffer.js
@@ -0,0 +1,30 @@
+'use strict'
+
+const typedArray = require('./typedArray')
+
+function describe (props) {
+  return new DescribedArrayBufferValue(Object.assign({
+    // Assume at least Node.js 4.5.0, which introduces Buffer.from()
+    buffer: Buffer.from(props.value),
+    // Set isArray and isList so the property recursor excludes the byte accessors
+    isArray: true,
+    isList: true
+  }, props))
+}
+exports.describe = describe
+
+function deserialize (state, recursor) {
+  return new DeserializedArrayBufferValue(state, recursor)
+}
+exports.deserialize = deserialize
+
+const tag = Symbol('ArrayBufferValue')
+exports.tag = tag
+
+// ArrayBuffers can be represented as regular Buffers, allowing them to be
+// treated as TypedArrays for the purposes of this package.
+class ArrayBufferValue extends typedArray.TypedArrayValue {}
+Object.defineProperty(ArrayBufferValue.prototype, 'tag', { value: tag })
+
+const DescribedArrayBufferValue = typedArray.DescribedMixin(ArrayBufferValue)
+const DeserializedArrayBufferValue = typedArray.DeserializedMixin(ArrayBufferValue)
diff --git a/node_modules/concordance/lib/complexValues/boxed.js b/node_modules/concordance/lib/complexValues/boxed.js
new file mode 100644
index 000000000..3736ad137
--- /dev/null
+++ b/node_modules/concordance/lib/complexValues/boxed.js
@@ -0,0 +1,51 @@
+'use strict'
+
+const recursorUtils = require('../recursorUtils')
+const stringPrimitive = require('../primitiveValues/string').tag
+const object = require('./object')
+
+function describe (props) {
+  return new DescribedBoxedValue(props)
+}
+exports.describe = describe
+
+function deserialize (state, recursor) {
+  return new DeserializedBoxedValue(state, recursor)
+}
+exports.deserialize = deserialize
+
+const tag = Symbol('BoxedValue')
+exports.tag = tag
+
+class BoxedValue extends object.ObjectValue {}
+Object.defineProperty(BoxedValue.prototype, 'tag', {value: tag})
+
+class DescribedBoxedValue extends object.DescribedMixin(BoxedValue) {
+  constructor (props) {
+    super(props)
+    this.unboxed = props.unboxed
+  }
+
+  createListRecursor () {
+    return recursorUtils.NOOP_RECURSOR
+  }
+
+  createPropertyRecursor () {
+    if (this.unboxed.tag !== stringPrimitive) return super.createPropertyRecursor()
+
+    // Just so that createPropertyRecursor() skips the index-based character
+    // properties.
+    try {
+      this.isList = true
+      return super.createPropertyRecursor()
+    } finally {
+      this.isList = false
+    }
+  }
+
+  createRecursor () {
+    return recursorUtils.unshift(super.createRecursor(), this.unboxed)
+  }
+}
+
+const DeserializedBoxedValue = object.DeserializedMixin(BoxedValue)
diff --git a/node_modules/concordance/lib/complexValues/dataView.js b/node_modules/concordance/lib/complexValues/dataView.js
new file mode 100644
index 000000000..0dd6199f6
--- /dev/null
+++ b/node_modules/concordance/lib/complexValues/dataView.js
@@ -0,0 +1,29 @@
+'use strict'
+
+const typedArray = require('./typedArray')
+
+function describe (props) {
+  return new DescribedDataViewValue(Object.assign({
+    buffer: typedArray.getBuffer(props.value),
+    // Set isArray and isList so the property recursor excludes the byte accessors
+    isArray: true,
+    isList: true
+  }, props))
+}
+exports.describe = describe
+
+function deserialize (state, recursor) {
+  return new DeserializedDataViewValue(state, recursor)
+}
+exports.deserialize = deserialize
+
+const tag = Symbol('DataViewValue')
+exports.tag = tag
+
+// DataViews can be represented as regular Buffers, allowing them to be treated
+// as TypedArrays for the purposes of this package.
+class DataViewValue extends typedArray.TypedArrayValue {}
+Object.defineProperty(DataViewValue.prototype, 'tag', { value: tag })
+
+const DescribedDataViewValue = typedArray.DescribedMixin(DataViewValue)
+const DeserializedDataViewValue = typedArray.DeserializedMixin(DataViewValue)
diff --git a/node_modules/concordance/lib/complexValues/date.js b/node_modules/concordance/lib/complexValues/date.js
new file mode 100644
index 000000000..b437456b8
--- /dev/null
+++ b/node_modules/concordance/lib/complexValues/date.js
@@ -0,0 +1,89 @@
+'use strict'
+
+const dateTime = require('date-time')
+
+const constants = require('../constants')
+const formatUtils = require('../formatUtils')
+const lineBuilder = require('../lineBuilder')
+const object = require('./object')
+
+const SHALLOW_EQUAL = constants.SHALLOW_EQUAL
+const UNEQUAL = constants.UNEQUAL
+
+function describe (props) {
+  const date = props.value
+  const invalid = isNaN(date.valueOf())
+  return new DescribedDateValue(Object.assign({}, props, {invalid}))
+}
+exports.describe = describe
+
+function deserialize (state, recursor) {
+  return new DeserializedDateValue(state, recursor)
+}
+exports.deserialize = deserialize
+
+const tag = Symbol('DateValue')
+exports.tag = tag
+
+function formatDate (date) {
+  // Always format in UTC. The local timezone shouldn't be used since it's most
+  // likely different from that of CI servers.
+  return dateTime({
+    date,
+    local: false,
+    showTimeZone: true,
+    showMilliseconds: true
+  })
+}
+
+class DateValue extends object.ObjectValue {
+  constructor (props) {
+    super(props)
+    this.invalid = props.invalid
+  }
+
+  compare (expected) {
+    const result = super.compare(expected)
+    if (result !== SHALLOW_EQUAL) return result
+
+    return (this.invalid && expected.invalid) || Object.is(this.value.getTime(), expected.value.getTime())
+      ? SHALLOW_EQUAL
+      : UNEQUAL
+  }
+
+  formatShallow (theme, indent) {
+    const string = formatUtils.formatCtorAndStringTag(theme, this) + ' ' +
+      (this.invalid ? theme.date.invalid : formatUtils.wrap(theme.date.value, formatDate(this.value))) + ' ' +
+      theme.object.openBracket
+
+    return super.formatShallow(theme, indent).customize({
+      finalize (innerLines) {
+        return innerLines.isEmpty
+          ? lineBuilder.single(string + theme.object.closeBracket)
+          : lineBuilder.first(string)
+              .concat(innerLines.withFirstPrefixed(indent.increase()).stripFlags())
+              .append(lineBuilder.last(indent + theme.object.closeBracket))
+      },
+
+      maxDepth () {
+        return lineBuilder.single(string + ' ' + theme.maxDepth + ' ' + theme.object.closeBracket)
+      }
+    })
+  }
+
+  serialize () {
+    const iso = this.invalid ? null : this.value.toISOString()
+    return [this.invalid, iso, super.serialize()]
+  }
+}
+Object.defineProperty(DateValue.prototype, 'tag', { value: tag })
+
+const DescribedDateValue = object.DescribedMixin(DateValue)
+
+class DeserializedDateValue extends object.DeserializedMixin(DateValue) {
+  constructor (state, recursor) {
+    super(state[2], recursor)
+    this.invalid = state[0]
+    this.value = new Date(this.invalid ? NaN : state[1])
+  }
+}
diff --git a/node_modules/concordance/lib/complexValues/error.js b/node_modules/concordance/lib/complexValues/error.js
new file mode 100644
index 000000000..781dd7e87
--- /dev/null
+++ b/node_modules/concordance/lib/complexValues/error.js
@@ -0,0 +1,133 @@
+'use strict'
+
+const constants = require('../constants')
+const isEnumerable = require('../isEnumerable')
+const formatUtils = require('../formatUtils')
+const lineBuilder = require('../lineBuilder')
+const NOOP_RECURSOR = require('../recursorUtils').NOOP_RECURSOR
+const object = require('./object')
+
+const UNEQUAL = constants.UNEQUAL
+
+function describe (props) {
+  const error = props.value
+  return new DescribedErrorValue(Object.assign({
+    nameIsEnumerable: isEnumerable(error, 'name'),
+    name: error.name,
+    messageIsEnumerable: isEnumerable(error, 'message'),
+    message: error.message
+  }, props))
+}
+exports.describe = describe
+
+function deserialize (state, recursor) {
+  return new DeserializedErrorValue(state, recursor)
+}
+exports.deserialize = deserialize
+
+const tag = Symbol('ErrorValue')
+exports.tag = tag
+
+class ErrorValue extends object.ObjectValue {
+  constructor (props) {
+    super(props)
+    this.name = props.name
+  }
+
+  compare (expected) {
+    return this.tag === expected.tag && this.name === expected.name
+      ? super.compare(expected)
+      : UNEQUAL
+  }
+
+  formatShallow (theme, indent) {
+    const name = this.name || this.ctor
+
+    let string = name
+      ? formatUtils.wrap(theme.error.name, name)
+      : formatUtils.wrap(theme.object.stringTag, this.stringTag)
+    if (this.ctor && this.ctor !== name) {
+      string += ' ' + formatUtils.wrap(theme.error.ctor, this.ctor)
+    }
+    if (this.stringTag && this.stringTag !== this.ctor && this.name && !this.name.includes(this.stringTag)) {
+      string += ' ' + formatUtils.wrap(theme.object.secondaryStringTag, this.stringTag)
+    }
+    string += ' ' + theme.object.openBracket
+
+    return super.formatShallow(theme, indent).customize({
+      finalize (innerLines) {
+        return innerLines.isEmpty
+          ? lineBuilder.single(string + theme.object.closeBracket)
+          : lineBuilder.first(string)
+              .concat(innerLines.withFirstPrefixed(indent.increase()).stripFlags())
+              .append(lineBuilder.last(indent + theme.object.closeBracket))
+      },
+
+      maxDepth () {
+        return lineBuilder.single(string + ' ' + theme.maxDepth + ' ' + theme.object.closeBracket)
+      }
+    })
+  }
+
+  serialize () {
+    return [this.name, super.serialize()]
+  }
+}
+Object.defineProperty(ErrorValue.prototype, 'tag', { value: tag })
+
+class DescribedErrorValue extends object.DescribedMixin(ErrorValue) {
+  constructor (props) {
+    super(props)
+    this.nameIsEnumerable = props.nameIsEnumerable
+    this.messageIsEnumerable = props.messageIsEnumerable
+    this.message = props.message
+  }
+
+  createPropertyRecursor () {
+    const recursor = super.createPropertyRecursor()
+
+    let skipName = this.nameIsEnumerable
+    let emitMessage = !this.messageIsEnumerable
+
+    let size = recursor.size
+    if (skipName && size > 0) {
+      size -= 1
+    }
+    if (emitMessage) {
+      size += 1
+    }
+
+    if (size === 0) return NOOP_RECURSOR
+
+    let done = false
+    const next = () => {
+      if (done) return null
+
+      const property = recursor.next()
+      if (property) {
+        if (skipName && property.key.value === 'name') {
+          skipName = false
+          return next()
+        }
+        return property
+      }
+
+      if (emitMessage) {
+        emitMessage = false
+        return this.describeProperty('message', this.describeAny(this.message))
+      }
+
+      done = true
+      return null
+    }
+
+    return { size, next }
+  }
+}
+
+class DeserializedErrorValue extends object.DeserializedMixin(ErrorValue) {
+  constructor (state, recursor) {
+    super(state[1], recursor)
+    this.name = state[0]
+  }
+}
diff --git a/node_modules/concordance/lib/complexValues/function.js b/node_modules/concordance/lib/complexValues/function.js
new file mode 100644
index 000000000..4ddd38f39
--- /dev/null
+++ b/node_modules/concordance/lib/complexValues/function.js
@@ -0,0 +1,159 @@
+'use strict'
+
+const functionNameSupport = require('function-name-support')
+
+const constants = require('../constants')
+const getStringTag = require('../getStringTag')
+const isEnumerable = require('../isEnumerable')
+const formatUtils = require('../formatUtils')
+const lineBuilder = require('../lineBuilder')
+const NOOP_RECURSOR = require('../recursorUtils').NOOP_RECURSOR
+const object = require('./object')
+
+const UNEQUAL = constants.UNEQUAL
+const SHALLOW_EQUAL = constants.SHALLOW_EQUAL
+
+// Node.js 4 provides Function, more recent versions use GeneratorFunction
+const generatorsHaveGeneratorTag = getStringTag(function * () {}) === 'GeneratorFunction'
+
+function describe (props) {
+  const fn = props.value
+  return new DescribedFunctionValue(Object.assign({
+    nameIsEnumerable: isEnumerable(fn, 'name'),
+    name: typeof fn.name === 'string' ? fn.name : null
+  }, props))
+}
+exports.describe = describe
+
+function deserialize (state, recursor) {
+  return new DeserializedFunctionValue(state, recursor)
+}
+exports.deserialize = deserialize
+
+const tag = Symbol('FunctionValue')
+exports.tag = tag
+
+class FunctionValue extends object.ObjectValue {
+  constructor (props) {
+    super(props)
+    this.name = props.name
+  }
+
+  formatShallow (theme, indent) {
+    const string = formatUtils.wrap(theme.function.stringTag, this.stringTag) +
+      (this.name ? ' ' + formatUtils.wrap(theme.function.name, this.name) : '') +
+      ' ' + theme.object.openBracket
+
+    return super.formatShallow(theme, indent).customize({
+      finalize (innerLines) {
+        return innerLines.isEmpty
+          ? lineBuilder.single(string + theme.object.closeBracket)
+          : lineBuilder.first(string)
+              .concat(innerLines.withFirstPrefixed(indent.increase()).stripFlags())
+              .append(lineBuilder.last(indent + theme.object.closeBracket))
+      },
+
+      maxDepth () {
+        return lineBuilder.single(string + ' ' + theme.maxDepth + ' ' + theme.object.closeBracket)
+      }
+    })
+  }
+}
+Object.defineProperty(FunctionValue.prototype, 'tag', { value: tag })
+
+class DescribedFunctionValue extends object.DescribedMixin(FunctionValue) {
+  constructor (props) {
+    super(props)
+    this.nameIsEnumerable = props.nameIsEnumerable
+  }
+
+  compare (expected) {
+    if (this.tag !== expected.tag) return UNEQUAL
+    if (this.name !== expected.name) return UNEQUAL
+    if (this.value && expected.value && this.value !== expected.value) return UNEQUAL
+
+    return super.compare(expected)
+  }
+
+  createPropertyRecursor () {
+    const recursor = super.createPropertyRecursor()
+
+    const skipName = this.nameIsEnumerable
+    if (!skipName) return recursor
+
+    let size = recursor.size
+    if (skipName) {
+      size -= 1
+    }
+
+    if (size === 0) return NOOP_RECURSOR
+
+    const next = () => {
+      const property = recursor.next()
+      if (property) {
+        if (skipName && property.key.value === 'name') {
+          return next()
+        }
+        return property
+      }
+
+      return null
+    }
+
+    return { size, next }
+  }
+
+  serialize () {
+    return [this.name, generatorsHaveGeneratorTag, super.serialize()]
+  }
+}
+
+class DeserializedFunctionValue extends object.DeserializedMixin(FunctionValue) {
+  constructor (state, recursor) {
+    super(state[2], recursor)
+    this.name = state[0]
+    this.trustStringTag = state[1]
+  }
+
+  compare (expected) {
+    if (this.tag !== expected.tag) return UNEQUAL
+
+    if (this.name !== expected.name) {
+      if (this.functionNameSupportFlags === functionNameSupport.bitFlags) {
+        // The engine used to create the serialization supports the same
+        // function name inference as the current engine. That said, unless
+        // the engine has full support for name inference, it's possible that
+        // names were lost simply due to refactoring. Names are unequal if
+        // the engine has full support, or if names were inferred.
+        if (functionNameSupport.hasFullSupport === true || (this.name !== '' && expected.name !== '')) return UNEQUAL
+      } else if (functionNameSupport.isSubsetOf(this.functionNameSupportFlags)) {
+        // The engine used to create the serialization could infer more function
+        // names than the current engine. Assume `expected.name` comes from the
+        // current engine and treat the names as unequal only if the current
+        // engine could infer a name.
+        if (expected.name !== '') return UNEQUAL
+      } else {
+        /* istanbul ignore else */
+        if (functionNameSupport.isSupersetOf(this.functionNameSupportFlags)) {
+          // The engine used to create the serialization could infer fewer
+          // function names than the current engine. Treat the names as unequal
+          // only if a name was in the serialization.
+          if (this.name !== '') return UNEQUAL
+        }
+      }
+    }
+
+    // Assume `stringTag` is either 'Function' or 'GeneratorFunction', and that
+    // it always equals `ctor`. Since Node.js 4 only provides 'Function', even
+    // for generator functions, only compare `stringTag` if the serialized value
+    // legitimately would have been `Function`, and the expected `stringTag` can
+    // reliably be inferred.
+    if (this.trustStringTag && generatorsHaveGeneratorTag && this.stringTag !== expected.stringTag) return UNEQUAL
+
+    return SHALLOW_EQUAL
+  }
+
+  serialize () {
+    return [this.name, this.trustStringTag, super.serialize()]
+  }
+}
diff --git a/node_modules/concordance/lib/complexValues/global.js b/node_modules/concordance/lib/complexValues/global.js
new file mode 100644
index 000000000..6acd66d7a
--- /dev/null
+++ b/node_modules/concordance/lib/complexValues/global.js
@@ -0,0 +1,33 @@
+'use strict'
+
+const constants = require('../constants')
+const formatUtils = require('../formatUtils')
+const lineBuilder = require('../lineBuilder')
+
+const DEEP_EQUAL = constants.DEEP_EQUAL
+const UNEQUAL = constants.UNEQUAL
+
+function describe () {
+  return new GlobalValue()
+}
+exports.describe = describe
+
+exports.deserialize = describe
+
+const tag = Symbol('GlobalValue')
+exports.tag = tag
+
+class GlobalValue {
+  compare (expected) {
+    return this.tag === expected.tag
+      ? DEEP_EQUAL
+      : UNEQUAL
+  }
+
+  formatDeep (theme) {
+    return lineBuilder.single(
+      formatUtils.wrap(theme.global, 'Global') + ' ' + theme.object.openBracket + theme.object.closeBracket)
+  }
+}
+Object.defineProperty(GlobalValue.prototype, 'isComplex', { value: true })
+Object.defineProperty(GlobalValue.prototype, 'tag', { value: tag })
diff --git a/node_modules/concordance/lib/complexValues/map.js b/node_modules/concordance/lib/complexValues/map.js
new file mode 100644
index 000000000..7ff13b217
--- /dev/null
+++ b/node_modules/concordance/lib/complexValues/map.js
@@ -0,0 +1,78 @@
+'use strict'
+
+const constants = require('../constants')
+const recursorUtils = require('../recursorUtils')
+const object = require('./object')
+
+const SHALLOW_EQUAL = constants.SHALLOW_EQUAL
+const UNEQUAL = constants.UNEQUAL
+
+function describe (props) {
+  return new DescribedMapValue(Object.assign({
+    size: props.value.size
+  }, props))
+}
+exports.describe = describe
+
+function deserialize (state, recursor) {
+  return new DeserializedMapValue(state, recursor)
+}
+exports.deserialize = deserialize
+
+const tag = Symbol('MapValue')
+exports.tag = tag
+
+class MapValue extends object.ObjectValue {
+  constructor (props) {
+    super(props)
+    this.size = props.size
+  }
+
+  compare (expected) {
+    const result = super.compare(expected)
+    if (result !== SHALLOW_EQUAL) return result
+
+    return this.size === expected.size
+      ? SHALLOW_EQUAL
+      : UNEQUAL
+  }
+
+  prepareDiff (expected) {
+    // Maps should be compared, even if they have a different number of entries.
+    return {compareResult: super.compare(expected)}
+  }
+
+  serialize () {
+    return [this.size, super.serialize()]
+  }
+}
+Object.defineProperty(MapValue.prototype, 'tag', { value: tag })
+
+class DescribedMapValue extends object.DescribedMixin(MapValue) {
+  createIterableRecursor () {
+    const size = this.size
+    if (size === 0) return recursorUtils.NOOP_RECURSOR
+
+    let index = 0
+    let entries
+    const next = () => {
+      if (index === size) return null
+
+      if (!entries) {
+        entries = Array.from(this.value)
+      }
+
+      const entry = entries[index++]
+      return this.describeMapEntry(this.describeAny(entry[0]), this.describeAny(entry[1]))
+    }
+
+    return { size, next }
+  }
+}
+
+class DeserializedMapValue extends object.DeserializedMixin(MapValue) {
+  constructor (state, recursor) {
+    super(state[1], recursor)
+    this.size = state[0]
+  }
+}
diff --git a/node_modules/concordance/lib/complexValues/object.js b/node_modules/concordance/lib/complexValues/object.js
new file mode 100644
index 000000000..97a59285c
--- /dev/null
+++ b/node_modules/concordance/lib/complexValues/object.js
@@ -0,0 +1,283 @@
+'use strict'
+
+const functionNameSupport = require('function-name-support')
+
+const constants = require('../constants')
+const getObjectKeys = require('../getObjectKeys')
+const ObjectFormatter = require('../formatUtils').ObjectFormatter
+const hasLength = require('../hasLength')
+const recursorUtils = require('../recursorUtils')
+const stats = require('../metaDescriptors/stats')
+
+const DEEP_EQUAL = constants.DEEP_EQUAL
+const SHALLOW_EQUAL = constants.SHALLOW_EQUAL
+const UNEQUAL = constants.UNEQUAL
+
+function describe (props) {
+  const isArray = props.stringTag === 'Array'
+  const object = props.value
+  return new DescribedObjectValue(Object.assign({
+    isArray,
+    isIterable: object[Symbol.iterator] !== undefined,
+    isList: isArray || hasLength(object)
+  }, props))
+}
+exports.describe = describe
+
+function deserialize (state, recursor) {
+  return new DeserializedObjectValue(state, recursor)
+}
+exports.deserialize = deserialize
+
+const tag = Symbol('ObjectValue')
+exports.tag = tag
+
+class ObjectValue {
+  constructor (props) {
+    this.ctor = props.ctor
+    this.pointer = props.pointer
+    this.stringTag = props.stringTag
+
+    this.isArray = props.isArray === true
+    this.isIterable = props.isIterable === true
+    this.isList = props.isList === true
+  }
+
+  compare (expected) {
+    if (this.tag !== expected.tag) return UNEQUAL
+    if (this.stringTag !== expected.stringTag || !this.hasSameCtor(expected)) return UNEQUAL
+    return SHALLOW_EQUAL
+  }
+
+  hasSameCtor (expected) {
+    return this.ctor === expected.ctor
+  }
+
+  formatShallow (theme, indent) {
+    return new ObjectFormatter(this, theme, indent)
+  }
+
+  serialize () {
+    return [
+      this.ctor, this.pointer, this.stringTag,
+      this.isArray, this.isIterable, this.isList,
+      functionNameSupport.bitFlags
+    ]
+  }
+}
+Object.defineProperty(ObjectValue.prototype, 'isComplex', { value: true })
+Object.defineProperty(ObjectValue.prototype, 'tag', { value: tag })
+exports.ObjectValue = ObjectValue
+
+const DescribedObjectValue = DescribedMixin(ObjectValue)
+const DeserializedObjectValue = DeserializedMixin(ObjectValue)
+
+function DescribedMixin (base) {
+  return class extends base {
+    constructor (props) {
+      super(props)
+
+      this.value = props.value
+      this.describeAny = props.describeAny
+      this.describeItem = props.describeItem
+      this.describeMapEntry = props.describeMapEntry
+      this.describeProperty = props.describeProperty
+
+      this.iterableState = null
+      this.listState = null
+      this.propertyState = null
+    }
+
+    compare (expected) {
+      return this.value === expected.value
+        ? DEEP_EQUAL
+        : super.compare(expected)
+    }
+
+    createPropertyRecursor () {
+      const objectKeys = getObjectKeys(this.value, this.isList ? this.value.length : 0)
+      const size = objectKeys.size
+      if (size === 0) return recursorUtils.NOOP_RECURSOR
+
+      let index = 0
+      const next = () => {
+        if (index === size) return null
+
+        const key = objectKeys.keys[index++]
+        return this.describeProperty(key, this.describeAny(this.value[key]))
+      }
+
+      return { size, next }
+    }
+
+    createListRecursor () {
+      if (!this.isList) return recursorUtils.NOOP_RECURSOR
+
+      const size = this.value.length
+      if (size === 0) return recursorUtils.NOOP_RECURSOR
+
+      let index = 0
+      const next = () => {
+        if (index === size) return null
+
+        const current = index
+        index++
+        return this.describeItem(current, this.describeAny(this.value[current]))
+      }
+
+      return { size, next }
+    }
+
+    createIterableRecursor () {
+      if (this.isArray || !this.isIterable) return recursorUtils.NOOP_RECURSOR
+
+      const iterator = this.value[Symbol.iterator]()
+      let first = iterator.next()
+
+      let done = false
+      let size = -1
+      if (first.done) {
+        if (first.value === undefined) {
+          size = 0
+          done = true
+        } else {
+          size = 1
+        }
+      }
+
+      let index = 0
+      const next = () => {
+        if (done) return null
+
+        while (!done) {
+          const current = first || iterator.next()
+          if (current === first) {
+            first = null
+          }
+          if (current.done) {
+            done = true
+          }
+
+          const item = current.value
+          if (done && item === undefined) return null
+
+          if (this.isList && this.value[index] === item) {
+            index++
+          } else {
+            return this.describeItem(index++, this.describeAny(item))
+          }
+        }
+      }
+
+      return { size, next }
+    }
+
+    createRecursor () {
+      let recursedProperty = false
+      let recursedList = false
+      let recursedIterable = false
+
+      let recursor = null
+      return () => {
+        let retval = null
+        do {
+          if (recursor !== null) {
+            retval = recursor.next()
+            if (retval === null) {
+              recursor = null
+            }
+          }
+
+          while (recursor === null && (!recursedList || !recursedProperty || !recursedIterable)) {
+            // Prioritize recursing lists
+            if (!recursedList) {
+              const replay = recursorUtils.replay(this.listState, () => this.createListRecursor())
+              this.listState = replay.state
+              recursor = replay.recursor
+              recursedList = true
+              if (recursor !== recursorUtils.NOOP_RECURSOR) {
+                retval = stats.describeListRecursor(recursor)
+              }
+            } else if (!recursedProperty) {
+              const replay = recursorUtils.replay(this.propertyState, () => this.createPropertyRecursor())
+              this.propertyState = replay.state
+              recursor = replay.recursor
+              recursedProperty = true
+              if (recursor !== recursorUtils.NOOP_RECURSOR) {
+                retval = stats.describePropertyRecursor(recursor)
+              }
+            } else if (!recursedIterable) {
+              const replay = recursorUtils.replay(this.iterableState, () => this.createIterableRecursor())
+              this.iterableState = replay.state
+              recursor = replay.recursor
+              recursedIterable = true
+              if (recursor !== recursorUtils.NOOP_RECURSOR) {
+                retval = stats.describeIterableRecursor(recursor)
+              }
+            }
+          }
+        } while (recursor !== null && retval === null)
+
+        return retval
+      }
+    }
+  }
+}
+exports.DescribedMixin = DescribedMixin
+
+function DeserializedMixin (base) {
+  return class extends base {
+    constructor (state, recursor) {
+      super({
+        ctor: state[0],
+        pointer: state[1],
+        stringTag: state[2],
+        isArray: state[3],
+        isIterable: state[4],
+        isList: state[5]
+      })
+
+      this.functionNameSupportFlags = state[6]
+      this.deserializedRecursor = recursor
+      this.replayState = null
+    }
+
+    createRecursor () {
+      if (!this.deserializedRecursor) return () => null
+
+      const replay = recursorUtils.replay(this.replayState, () => ({ size: -1, next: this.deserializedRecursor }))
+      this.replayState = replay.state
+      return replay.recursor.next
+    }
+
+    hasSameCtor (expected) {
+      if (this.ctor === expected.ctor) return true
+
+      if (this.functionNameSupportFlags === functionNameSupport.bitFlags) {
+        // The engine used to create the serialization supports the same
+        // function name inference as the current engine. That said, unless
+        // the engine has full support for name inference, it's possible that
+        // names were lost simply due to refactoring. Ctors are not the same
+        // only if the engine has full support, or if ctors were inferred.
+        if (functionNameSupport.hasFullSupport === true || (this.ctor !== null && expected.ctor !== null)) return false
+      } else if (functionNameSupport.isSubsetOf(this.functionNameSupportFlags)) {
+        // The engine used to create the serialization could infer more function
+        // names than the current engine. Assume `expected.ctor` comes from the
+        // current engine and treat the ctors as unequal only if the current
+        // engine could infer a ctor.
+        if (expected.ctor !== null) return false
+      } else {
+        /* istanbul ignore else */
+        if (functionNameSupport.isSupersetOf(this.functionNameSupportFlags)) {
+          // The engine used to create the serialization could infer fewer
+          // function names than the current engine. Treat the ctors as unequal
+          // only if a ctor was in the serialization.
+          if (this.ctor !== null) return false
+        }
+      }
+
+      return true
+    }
+  }
+}
+exports.DeserializedMixin = DeserializedMixin
diff --git a/node_modules/concordance/lib/complexValues/promise.js b/node_modules/concordance/lib/complexValues/promise.js
new file mode 100644
index 000000000..823d45386
--- /dev/null
+++ b/node_modules/concordance/lib/complexValues/promise.js
@@ -0,0 +1,40 @@
+'use strict'
+
+const constants = require('../constants')
+const object = require('./object')
+
+const DEEP_EQUAL = constants.DEEP_EQUAL
+const UNEQUAL = constants.UNEQUAL
+
+function describe (props) {
+  return new DescribedPromiseValue(props)
+}
+exports.describe = describe
+
+function deserialize (props) {
+  return new DeserializedPromiseValue(props)
+}
+exports.deserialize = deserialize
+
+const tag = Symbol('PromiseValue')
+exports.tag = tag
+
+class PromiseValue extends object.ObjectValue {}
+Object.defineProperty(PromiseValue.prototype, 'tag', { value: tag })
+
+class DescribedPromiseValue extends object.DescribedMixin(PromiseValue) {
+  compare (expected) {
+    // When comparing described promises, require them to be the exact same
+    // object.
+    return super.compare(expected) === DEEP_EQUAL
+      ? DEEP_EQUAL
+      : UNEQUAL
+  }
+}
+
+class DeserializedPromiseValue extends object.DeserializedMixin(PromiseValue) {
+  compare (expected) {
+    // Deserialized promises can never be compared using object references.
+    return super.compare(expected)
+  }
+}
diff --git a/node_modules/concordance/lib/complexValues/regexp.js b/node_modules/concordance/lib/complexValues/regexp.js
new file mode 100644
index 000000000..1c66a2fd8
--- /dev/null
+++ b/node_modules/concordance/lib/complexValues/regexp.js
@@ -0,0 +1,90 @@
+'use strict'
+
+const constants = require('../constants')
+const formatUtils = require('../formatUtils')
+const lineBuilder = require('../lineBuilder')
+const object = require('./object')
+
+const UNEQUAL = constants.UNEQUAL
+
+function describe (props) {
+  const regexp = props.value
+  return new DescribedRegexpValue(Object.assign({
+    flags: getSortedFlags(regexp),
+    source: regexp.source
+  }, props))
+}
+exports.describe = describe
+
+function deserialize (state, recursor) {
+  return new DeserializedRegexpValue(state, recursor)
+}
+exports.deserialize = deserialize
+
+const tag = Symbol('RegexpValue')
+exports.tag = tag
+
+function getSortedFlags (regexp) {
+  const flags = regexp.flags || String(regexp).slice(regexp.source.length + 2)
+  return flags.split('').sort().join('')
+}
+
+class RegexpValue extends object.ObjectValue {
+  constructor (props) {
+    super(props)
+    this.flags = props.flags
+    this.source = props.source
+  }
+
+  compare (expected) {
+    return this.tag === expected.tag && this.flags === expected.flags && this.source === expected.source
+      ? super.compare(expected)
+      : UNEQUAL
+  }
+
+  formatShallow (theme, indent) {
+    const ctor = this.ctor || this.stringTag
+    const regexp = formatUtils.wrap(theme.regexp.source, this.source) + formatUtils.wrap(theme.regexp.flags, this.flags)
+
+    return super.formatShallow(theme, indent).customize({
+      finalize: innerLines => {
+        if (ctor === 'RegExp' && innerLines.isEmpty) return lineBuilder.single(regexp)
+
+        const innerIndentation = indent.increase()
+        const header = lineBuilder.first(formatUtils.formatCtorAndStringTag(theme, this) + ' ' + theme.object.openBracket)
+          .concat(lineBuilder.line(innerIndentation + regexp))
+
+        if (!innerLines.isEmpty) {
+          header.append(lineBuilder.line(innerIndentation + theme.regexp.separator))
+          header.append(innerLines.withFirstPrefixed(innerIndentation).stripFlags())
+        }
+
+        return header.append(lineBuilder.last(indent + theme.object.closeBracket))
+      },
+
+      maxDepth: () => {
+        return lineBuilder.single(
+          formatUtils.formatCtorAndStringTag(theme, this) + ' ' +
+          theme.object.openBracket + ' ' +
+          regexp + ' ' +
+          theme.maxDepth + ' ' +
+          theme.object.closeBracket)
+      }
+    })
+  }
+
+  serialize () {
+    return [this.flags, this.source, super.serialize()]
+  }
+}
+Object.defineProperty(RegexpValue.prototype, 'tag', { value: tag })
+
+const DescribedRegexpValue = object.DescribedMixin(RegexpValue)
+
+class DeserializedRegexpValue extends object.DeserializedMixin(RegexpValue) {
+  constructor (state, recursor) {
+    super(state[2], recursor)
+    this.flags = state[0]
+    this.source = state[1]
+  }
+}
diff --git a/node_modules/concordance/lib/complexValues/set.js b/node_modules/concordance/lib/complexValues/set.js
new file mode 100644
index 000000000..fc3623ace
--- /dev/null
+++ b/node_modules/concordance/lib/complexValues/set.js
@@ -0,0 +1,78 @@
+'use strict'
+
+const constants = require('../constants')
+const recursorUtils = require('../recursorUtils')
+const object = require('./object')
+
+const SHALLOW_EQUAL = constants.SHALLOW_EQUAL
+const UNEQUAL = constants.UNEQUAL
+
+function describe (props) {
+  return new DescribedSetValue(Object.assign({
+    size: props.value.size
+  }, props))
+}
+exports.describe = describe
+
+function deserialize (state, recursor) {
+  return new DeserializedSetValue(state, recursor)
+}
+exports.deserialize = deserialize
+
+const tag = Symbol('SetValue')
+exports.tag = tag
+
+class SetValue extends object.ObjectValue {
+  constructor (props) {
+    super(props)
+    this.size = props.size
+  }
+
+  compare (expected) {
+    const result = super.compare(expected)
+    if (result !== SHALLOW_EQUAL) return result
+
+    return this.size === expected.size
+      ? SHALLOW_EQUAL
+      : UNEQUAL
+  }
+
+  prepareDiff (expected) {
+    // Sets should be compared, even if they have a different number of items.
+    return {compareResult: super.compare(expected)}
+  }
+
+  serialize () {
+    return [this.size, super.serialize()]
+  }
+}
+Object.defineProperty(SetValue.prototype, 'tag', { value: tag })
+
+class DescribedSetValue extends object.DescribedMixin(SetValue) {
+  createIterableRecursor () {
+    const size = this.size
+    if (size === 0) return recursorUtils.NOOP_RECURSOR
+
+    let index = 0
+    let members
+    const next = () => {
+      if (index === size) return null
+
+      if (!members) {
+        members = Array.from(this.value)
+      }
+
+      const value = members[index]
+      return this.describeItem(index++, this.describeAny(value))
+    }
+
+    return { size, next }
+  }
+}
+
+class DeserializedSetValue extends object.DeserializedMixin(SetValue) {
+  constructor (state, recursor) {
+    super(state[1], recursor)
+    this.size = state[0]
+  }
+}
diff --git a/node_modules/concordance/lib/complexValues/typedArray.js b/node_modules/concordance/lib/complexValues/typedArray.js
new file mode 100644
index 000000000..5c482ff1f
--- /dev/null
+++ b/node_modules/concordance/lib/complexValues/typedArray.js
@@ -0,0 +1,162 @@
+'use strict'
+
+const constants = require('../constants')
+const formatUtils = require('../formatUtils')
+const lineBuilder = require('../lineBuilder')
+const recursorUtils = require('../recursorUtils')
+const propertyStatsTag = require('../metaDescriptors/stats').propertyTag
+const object = require('./object')
+
+const DEEP_EQUAL = constants.DEEP_EQUAL
+const UNEQUAL = constants.UNEQUAL
+
+function getBuffer (value) {
+  // Assume at least Node.js 4.5.0, which introduces Buffer.from()
+  const buffer = Buffer.from(value.buffer)
+  return value.byteLength !== value.buffer.byteLength
+    ? buffer.slice(value.byteOffset, value.byteOffset + value.byteLength)
+    : buffer
+}
+exports.getBuffer = getBuffer
+
+function describe (props) {
+  return new DescribedTypedArrayValue(Object.assign({
+    buffer: getBuffer(props.value),
+    // Set isArray and isList so the property recursor excludes the byte accessors
+    isArray: true,
+    isList: true
+  }, props))
+}
+exports.describe = describe
+
+function deserialize (state, recursor) {
+  return new DeserializedTypedArrayValue(state, recursor)
+}
+exports.deserialize = deserialize
+
+function deserializeBytes (buffer) {
+  return new Bytes(buffer)
+}
+exports.deserializeBytes = deserializeBytes
+
+const bytesTag = Symbol('Bytes')
+exports.bytesTag = bytesTag
+
+const tag = Symbol('TypedArrayValue')
+exports.tag = tag
+
+class Bytes {
+  constructor (buffer) {
+    this.buffer = buffer
+  }
+
+  compare (expected) {
+    return expected.tag === bytesTag && this.buffer.equals(expected.buffer)
+      ? DEEP_EQUAL
+      : UNEQUAL
+  }
+
+  formatDeep (theme, indent) {
+    const indentation = indent
+    const lines = lineBuilder.buffer()
+
+    // Display 4-byte words, 8 per line
+    let string = ''
+    let isFirst = true
+    for (let offset = 0; offset < this.buffer.length; offset += 4) {
+      if (offset > 0) {
+        if (offset % 32 === 0) {
+          if (isFirst) {
+            lines.append(lineBuilder.first(string))
+            isFirst = false
+          } else {
+            lines.append(lineBuilder.line(string))
+          }
+          string = String(indentation)
+        } else {
+          string += ' '
+        }
+      }
+      string += formatUtils.wrap(theme.typedArray.bytes, this.buffer.toString('hex', offset, offset + 4))
+    }
+
+    return isFirst
+      ? lineBuilder.single(string)
+      : lines.append(lineBuilder.last(string))
+  }
+
+  serialize () {
+    return this.buffer
+  }
+}
+Object.defineProperty(Bytes.prototype, 'tag', { value: bytesTag })
+
+class TypedArrayValue extends object.ObjectValue {
+  constructor (props) {
+    super(props)
+    this.buffer = props.buffer
+  }
+
+  formatShallow (theme, indent) {
+    return super.formatShallow(theme, indent).customize({
+      shouldFormat (subject) {
+        if (subject.tag === propertyStatsTag) return subject.size > 1
+        if (subject.isProperty === true) return subject.key.value !== 'byteLength'
+        if (subject.tag === bytesTag) return subject.buffer.byteLength > 0
+        return true
+      }
+    })
+  }
+}
+Object.defineProperty(TypedArrayValue.prototype, 'tag', { value: tag })
+exports.TypedArrayValue = TypedArrayValue
+
+function DescribedMixin (base) {
+  return class extends object.DescribedMixin(base) {
+    // The list isn't recursed. Instead a Bytes instance is returned by the main
+    // recursor.
+    createListRecursor () {
+      return recursorUtils.NOOP_RECURSOR
+    }
+
+    createPropertyRecursor () {
+      const recursor = super.createPropertyRecursor()
+      const size = recursor.size + 1
+
+      let done = false
+      const next = () => {
+        if (done) return null
+
+        const property = recursor.next()
+        if (property) return property
+
+        done = true
+        return this.describeProperty('byteLength', this.describeAny(this.buffer.byteLength))
+      }
+
+      return { size, next }
+    }
+
+    createRecursor () {
+      return recursorUtils.unshift(super.createRecursor(), new Bytes(this.buffer))
+    }
+  }
+}
+exports.DescribedMixin = DescribedMixin
+
+const DescribedTypedArrayValue = DescribedMixin(TypedArrayValue)
+
+function DeserializedMixin (base) {
+  return class extends object.DeserializedMixin(base) {
+    constructor (state, recursor) {
+      super(state, recursor)
+
+      // Get the Bytes descriptor from the recursor. It contains the buffer.
+      const bytesDescriptor = this.createRecursor()()
+      this.buffer = bytesDescriptor.buffer
+    }
+  }
+}
+exports.DeserializedMixin = DeserializedMixin
+
+const DeserializedTypedArrayValue = DeserializedMixin(TypedArrayValue)