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+# Note: pending imminent deprecation
+
+**This module will be deprecated once npm v7 is released.  Please do not rely
+on it more than absolutely necessary (ie, only if you are depending on
+it for use with npm v6 internal dependencies).**
+
+----
+
+# figgy-pudding [![npm version](https://img.shields.io/npm/v/figgy-pudding.svg)](https://npm.im/figgy-pudding) [![license](https://img.shields.io/npm/l/figgy-pudding.svg)](https://npm.im/figgy-pudding) [![Travis](https://img.shields.io/travis/npm/figgy-pudding.svg)](https://travis-ci.org/npm/figgy-pudding) [![Coverage Status](https://coveralls.io/repos/github/npm/figgy-pudding/badge.svg?branch=latest)](https://coveralls.io/github/npm/figgy-pudding?branch=latest)
+
+[`figgy-pudding`](https://github.com/npm/figgy-pudding) is a small JavaScript
+library for managing and composing cascading options objects -- hiding what
+needs to be hidden from each layer, without having to do a lot of manual munging
+and passing of options.
+
+### The God Object is Dead!
+### Now Bring Us Some Figgy Pudding!
+
+## Install
+
+`$ npm install figgy-pudding`
+
+## Table of Contents
+
+* [Example](#example)
+* [Features](#features)
+* [API](#api)
+  * [`figgyPudding(spec)`](#figgy-pudding)
+  * [`PuddingFactory(values)`](#pudding-factory)
+    * [`opts.get()`](#opts-get)
+    * [`opts.concat()`](#opts-concat)
+    * [`opts.toJSON()`](#opts-to-json)
+    * [`opts.forEach()`](#opts-for-each)
+    * [`opts[Symbol.iterator]()`](#opts-symbol-iterator)
+    * [`opts.entries()`](#opts-entries)
+    * [`opts.keys()`](#opts-keys)
+    * [`opts.value()`](#opts-values)
+
+### Example
+
+```javascript
+// print-package.js
+const fetch = require('./fetch.js')
+const puddin = require('figgy-pudding')
+
+const PrintOpts = puddin({
+  json: { default: false }
+})
+
+async function printPkg (name, opts) {
+  // Expected pattern is to call this in every interface function. If `opts` is
+  // not passed in, it will automatically create an (empty) object for it.
+  opts = PrintOpts(opts)
+  const uri = `https://registry.npmjs.com/${name}`
+  const res = await fetch(uri, opts.concat({
+    // Add or override any passed-in configs and pass them down.
+    log: customLogger
+  }))
+  // The following would throw an error, because it's not in PrintOpts:
+  // console.log(opts.log)
+  if (opts.json) {
+    return res.json()
+  } else {
+    return res.text()
+  }
+}
+
+console.log(await printPkg('figgy', {
+  // Pass in *all* configs at the toplevel, as a regular object.
+  json: true,
+  cache: './tmp-cache'
+}))
+```
+
+```javascript
+// fetch.js
+const puddin = require('figgy-pudding')
+
+const FetchOpts = puddin({
+  log: { default: require('npmlog') },
+  cache: {}
+})
+
+module.exports = async function (..., opts) {
+  opts = FetchOpts(opts)
+}
+```
+
+### Features
+
+* hide options from layer that didn't ask for it
+* shared multi-layer options
+* make sure `opts` argument is available
+* transparent key access like normal keys, through a Proxy. No need for`.get()`!
+* default values
+* key aliases
+* arbitrary key filter functions
+* key/value iteration
+* serialization
+* 100% test coverage using `tap --100`
+
+### API
+
+#### <a name="figgy-pudding"></a> `> figgyPudding({ key: { default: val } | String }, [opts]) -> PuddingFactory`
+
+Defines an Options constructor that can be used to collect only the needed
+options.
+
+An optional `default` property for specs can be used to specify default values
+if nothing was passed in.
+
+If the value for a spec is a string, it will be treated as an alias to that
+other key.
+
+##### Example
+
+```javascript
+const MyAppOpts = figgyPudding({
+  lg: 'log',
+  log: {
+    default: () => require('npmlog')
+  },
+  cache: {}
+})
+```
+
+#### <a name="pudding-factory"></a> `> PuddingFactory(...providers) -> FiggyPudding{}`
+
+Instantiates an options object defined by `figgyPudding()`, which uses
+`providers`, in order, to find requested properties.
+
+Each provider can be either a plain object, a `Map`-like object (that is, one
+with a `.get()` method) or another figgyPudding `Opts` object.
+
+When nesting `Opts` objects, their properties will not become available to the
+new object, but any further nested `Opts` that reference that property _will_ be
+able to read from their grandparent, as long as they define that key. Default
+values for nested `Opts` parents will be used, if found.
+
+##### Example
+
+```javascript
+const ReqOpts = figgyPudding({
+  follow: {}
+})
+
+const opts = ReqOpts({
+  follow: true,
+  log: require('npmlog')
+})
+
+opts.follow // => true
+opts.log // => Error: ReqOpts does not define `log`
+
+const MoreOpts = figgyPudding({
+  log: {}
+})
+MoreOpts(opts).log // => npmlog object (passed in from original plain obj)
+MoreOpts(opts).follow // => Error: MoreOpts does not define `follow`
+```
+
+#### <a name="opts-get"></a> `> opts.get(key) -> Value`
+
+Gets a value from the options object.
+
+##### Example
+
+```js
+const opts = MyOpts(config)
+opts.get('foo') // value of `foo`
+opts.foo // Proxy-based access through `.get()`
+```
+
+#### <a name="opts-concat"></a> `> opts.concat(...moreProviders) -> FiggyPudding{}`
+
+Creates a new opts object of the same type as `opts` with additional providers.
+Providers further to the right shadow providers to the left, with properties in
+the original `opts` being shadows by the new providers.
+
+##### Example
+
+```js
+const opts = MyOpts({x: 1})
+opts.get('x') // 1
+opts.concat({x: 2}).get('x') // 2
+opts.get('x') // 1 (original opts object left intact)
+```
+
+#### <a name="opts-to-json"></a> `> opts.toJSON() -> Value`
+
+Converts `opts` to a plain, JSON-stringifiable JavaScript value. Used internally
+by JavaScript to get `JSON.stringify()` working.
+
+Only keys that are readable by the current pudding type will be serialized.
+
+##### Example
+
+```js
+const opts = MyOpts({x: 1})
+opts.toJSON() // {x: 1}
+JSON.stringify(opts) // '{"x":1}'
+```
+
+#### <a name="opts-for-each"></a> `> opts.forEach((value, key, opts) => {}, thisArg) -> undefined`
+
+Iterates over the values of `opts`, limited to the keys readable by the current
+pudding type. `thisArg` will be used to set the `this` argument when calling the
+`fn`.
+
+##### Example
+
+```js
+const opts = MyOpts({x: 1, y: 2})
+opts.forEach((value, key) => console.log(key, '=', value))
+```
+
+#### <a name="opts-entries"></a> `> opts.entries() -> Iterator<[[key, value], ...]>`
+
+Returns an iterator that iterates over the keys and values in `opts`, limited to
+the keys readable by the current pudding type. Each iteration returns an array
+of `[key, value]`.
+
+##### Example
+
+```js
+const opts = MyOpts({x: 1, y: 2})
+[...opts({x: 1, y: 2}).entries()] // [['x', 1], ['y', 2]]
+```
+
+#### <a name="opts-symbol-iterator"></a> `> opts[Symbol.iterator]() -> Iterator<[[key, value], ...]>`
+
+Returns an iterator that iterates over the keys and values in `opts`, limited to
+the keys readable by the current pudding type. Each iteration returns an array
+of `[key, value]`. Makes puddings work natively with JS iteration mechanisms.
+
+##### Example
+
+```js
+const opts = MyOpts({x: 1, y: 2})
+[...opts({x: 1, y: 2})] // [['x', 1], ['y', 2]]
+for (let [key, value] of opts({x: 1, y: 2})) {
+  console.log(key, '=', value)
+}
+```
+
+#### <a name="opts-keys"></a> `> opts.keys() -> Iterator<[key, ...]>`
+
+Returns an iterator that iterates over the keys in `opts`, limited to the keys
+readable by the current pudding type.
+
+##### Example
+
+```js
+const opts = MyOpts({x: 1, y: 2})
+[...opts({x: 1, y: 2}).keys()] // ['x', 'y']
+```
+
+#### <a name="opts-values"></a> `> opts.values() -> Iterator<[value, ...]>`
+
+Returns an iterator that iterates over the values in `opts`, limited to the keys
+readable by the current pudding type.
+
+##### Example
+'
+```js
+const opts = MyOpts({x: 1, y: 2})
+[...opts({x: 1, y: 2}).values()] // [1, 2]
+```