5 files changed, 144 insertions, 0 deletions
diff --git a/node_modules/release-zalgo/lib/Async.js b/node_modules/release-zalgo/lib/Async.js
new file mode 100644
index 000000000..846f7add0
--- /dev/null
+++ b/node_modules/release-zalgo/lib/Async.js
@@ -0,0 +1,21 @@
+'use strict'
+
+class Async {
+  run (executors) {
+    const args = Array.from(arguments).slice(1)
+    return new Promise(resolve => resolve(executors.async.apply(null, args)))
+  }
+
+  all (arr) {
+    return Promise.all(arr)
+  }
+
+  returns (value) {
+    return Promise.resolve(value)
+  }
+
+  throws (reason) {
+    return Promise.reject(reason)
+  }
+}
+module.exports = Async
diff --git a/node_modules/release-zalgo/lib/Sync.js b/node_modules/release-zalgo/lib/Sync.js
new file mode 100644
index 000000000..d081d5f59
--- /dev/null
+++ b/node_modules/release-zalgo/lib/Sync.js
@@ -0,0 +1,24 @@
+'use strict'
+
+const Thenable = require('./Thenable')
+const unwrapSync = require('./unwrapSync')
+
+class Sync {
+  run (executors) {
+    const args = Array.from(arguments).slice(1)
+    return new Thenable(() => executors.sync.apply(null, args))
+  }
+
+  all (arr) {
+    return new Thenable(() => arr.map(value => unwrapSync(value)))
+  }
+
+  returns (value) {
+    return new Thenable(() => value)
+  }
+
+  throws (reason) {
+    return new Thenable(() => { throw reason })
+  }
+}
+module.exports = Sync
diff --git a/node_modules/release-zalgo/lib/Thenable.js b/node_modules/release-zalgo/lib/Thenable.js
new file mode 100644
index 000000000..7a809b266
--- /dev/null
+++ b/node_modules/release-zalgo/lib/Thenable.js
@@ -0,0 +1,39 @@
+'use strict'
+
+const constants = require('./constants')
+const unwrapSync = require('./unwrapSync')
+
+// Behaves like a Promise, though the then() and catch() methods are unbound and
+// must be called with the instance as their thisArg.
+//
+// The executor must either return a value or throw a rejection reason. It is
+// not provided resolver or rejecter methods. The executor may return another
+// thenable.
+class Thenable {
+  constructor (executor) {
+    try {
+      this.result = unwrapSync(executor())
+      this.state = constants.RESOLVED
+    } catch (err) {
+      this.result = err
+      this.state = constants.REJECTED
+    }
+  }
+
+  then (onFulfilled, onRejected) {
+    if (this.state === constants.RESOLVED && typeof onFulfilled === 'function') {
+      return new Thenable(() => onFulfilled(this.result))
+    }
+
+    if (this.state === constants.REJECTED && typeof onRejected === 'function') {
+      return new Thenable(() => onRejected(this.result))
+    }
+
+    return this
+  }
+
+  catch (onRejected) {
+    return this.then(null, onRejected)
+  }
+}
+module.exports = Thenable
diff --git a/node_modules/release-zalgo/lib/constants.js b/node_modules/release-zalgo/lib/constants.js
new file mode 100644
index 000000000..8c417b5fa
--- /dev/null
+++ b/node_modules/release-zalgo/lib/constants.js
@@ -0,0 +1,6 @@
+'use strict'
+
+exports.PENDING = Symbol('PENDING')
+exports.RESOLVED = Symbol('RESOLVED')
+exports.REJECTED = Symbol('REJECTED')
+exports.ASYNC = Symbol('ASYNC')
diff --git a/node_modules/release-zalgo/lib/unwrapSync.js b/node_modules/release-zalgo/lib/unwrapSync.js
new file mode 100644
index 000000000..baa130b18
--- /dev/null
+++ b/node_modules/release-zalgo/lib/unwrapSync.js
@@ -0,0 +1,54 @@
+'use strict'
+
+const ExtendableError = require('es6-error')
+
+const constants = require('./constants')
+
+class UnwrapError extends ExtendableError {
+  constructor (thenable) {
+    super('Could not unwrap asynchronous thenable')
+    this.thenable = thenable
+  }
+}
+
+// Logic is derived from the Promise Resolution Procedure, as described in the
+// Promises/A+ specification: https://promisesaplus.com/#point-45
+//
+// Note that there is no cycle detection.
+function unwrapSync (x) {
+  if (!x || typeof x !== 'object' && typeof x !== 'function') {
+    return x
+  }
+
+  const then = x.then
+  if (typeof then !== 'function') return x
+
+  let state = constants.PENDING
+  let value
+  const unwrapValue = y => {
+    if (state === constants.PENDING) {
+      state = constants.RESOLVED
+      value = y
+    }
+  }
+  const unwrapReason = r => {
+    if (state === constants.PENDING) {
+      state = constants.REJECTED
+      value = r
+    }
+  }
+  then.call(x, unwrapValue, unwrapReason)
+
+  if (state === constants.PENDING) {
+    state = constants.ASYNC
+    throw new UnwrapError(x)
+  }
+
+  if (state === constants.RESOLVED) {
+    return unwrapSync(value)
+  }
+
+  // state === REJECTED
+  throw value
+}
+module.exports = unwrapSync