Index: node_modules/minipass/index.js
===================================================================
--- node_modules/minipass/index.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
+++ node_modules/minipass/index.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
@@ -0,0 +1,649 @@
+'use strict'
+const proc = typeof process === 'object' && process ? process : {
+  stdout: null,
+  stderr: null,
+}
+const EE = require('events')
+const Stream = require('stream')
+const SD = require('string_decoder').StringDecoder
+
+const EOF = Symbol('EOF')
+const MAYBE_EMIT_END = Symbol('maybeEmitEnd')
+const EMITTED_END = Symbol('emittedEnd')
+const EMITTING_END = Symbol('emittingEnd')
+const EMITTED_ERROR = Symbol('emittedError')
+const CLOSED = Symbol('closed')
+const READ = Symbol('read')
+const FLUSH = Symbol('flush')
+const FLUSHCHUNK = Symbol('flushChunk')
+const ENCODING = Symbol('encoding')
+const DECODER = Symbol('decoder')
+const FLOWING = Symbol('flowing')
+const PAUSED = Symbol('paused')
+const RESUME = Symbol('resume')
+const BUFFERLENGTH = Symbol('bufferLength')
+const BUFFERPUSH = Symbol('bufferPush')
+const BUFFERSHIFT = Symbol('bufferShift')
+const OBJECTMODE = Symbol('objectMode')
+const DESTROYED = Symbol('destroyed')
+const EMITDATA = Symbol('emitData')
+const EMITEND = Symbol('emitEnd')
+const EMITEND2 = Symbol('emitEnd2')
+const ASYNC = Symbol('async')
+
+const defer = fn => Promise.resolve().then(fn)
+
+// TODO remove when Node v8 support drops
+const doIter = global._MP_NO_ITERATOR_SYMBOLS_  !== '1'
+const ASYNCITERATOR = doIter && Symbol.asyncIterator
+  || Symbol('asyncIterator not implemented')
+const ITERATOR = doIter && Symbol.iterator
+  || Symbol('iterator not implemented')
+
+// events that mean 'the stream is over'
+// these are treated specially, and re-emitted
+// if they are listened for after emitting.
+const isEndish = ev =>
+  ev === 'end' ||
+  ev === 'finish' ||
+  ev === 'prefinish'
+
+const isArrayBuffer = b => b instanceof ArrayBuffer ||
+  typeof b === 'object' &&
+  b.constructor &&
+  b.constructor.name === 'ArrayBuffer' &&
+  b.byteLength >= 0
+
+const isArrayBufferView = b => !Buffer.isBuffer(b) && ArrayBuffer.isView(b)
+
+class Pipe {
+  constructor (src, dest, opts) {
+    this.src = src
+    this.dest = dest
+    this.opts = opts
+    this.ondrain = () => src[RESUME]()
+    dest.on('drain', this.ondrain)
+  }
+  unpipe () {
+    this.dest.removeListener('drain', this.ondrain)
+  }
+  // istanbul ignore next - only here for the prototype
+  proxyErrors () {}
+  end () {
+    this.unpipe()
+    if (this.opts.end)
+      this.dest.end()
+  }
+}
+
+class PipeProxyErrors extends Pipe {
+  unpipe () {
+    this.src.removeListener('error', this.proxyErrors)
+    super.unpipe()
+  }
+  constructor (src, dest, opts) {
+    super(src, dest, opts)
+    this.proxyErrors = er => dest.emit('error', er)
+    src.on('error', this.proxyErrors)
+  }
+}
+
+module.exports = class Minipass extends Stream {
+  constructor (options) {
+    super()
+    this[FLOWING] = false
+    // whether we're explicitly paused
+    this[PAUSED] = false
+    this.pipes = []
+    this.buffer = []
+    this[OBJECTMODE] = options && options.objectMode || false
+    if (this[OBJECTMODE])
+      this[ENCODING] = null
+    else
+      this[ENCODING] = options && options.encoding || null
+    if (this[ENCODING] === 'buffer')
+      this[ENCODING] = null
+    this[ASYNC] = options && !!options.async || false
+    this[DECODER] = this[ENCODING] ? new SD(this[ENCODING]) : null
+    this[EOF] = false
+    this[EMITTED_END] = false
+    this[EMITTING_END] = false
+    this[CLOSED] = false
+    this[EMITTED_ERROR] = null
+    this.writable = true
+    this.readable = true
+    this[BUFFERLENGTH] = 0
+    this[DESTROYED] = false
+  }
+
+  get bufferLength () { return this[BUFFERLENGTH] }
+
+  get encoding () { return this[ENCODING] }
+  set encoding (enc) {
+    if (this[OBJECTMODE])
+      throw new Error('cannot set encoding in objectMode')
+
+    if (this[ENCODING] && enc !== this[ENCODING] &&
+        (this[DECODER] && this[DECODER].lastNeed || this[BUFFERLENGTH]))
+      throw new Error('cannot change encoding')
+
+    if (this[ENCODING] !== enc) {
+      this[DECODER] = enc ? new SD(enc) : null
+      if (this.buffer.length)
+        this.buffer = this.buffer.map(chunk => this[DECODER].write(chunk))
+    }
+
+    this[ENCODING] = enc
+  }
+
+  setEncoding (enc) {
+    this.encoding = enc
+  }
+
+  get objectMode () { return this[OBJECTMODE] }
+  set objectMode (om) { this[OBJECTMODE] = this[OBJECTMODE] || !!om }
+
+  get ['async'] () { return this[ASYNC] }
+  set ['async'] (a) { this[ASYNC] = this[ASYNC] || !!a }
+
+  write (chunk, encoding, cb) {
+    if (this[EOF])
+      throw new Error('write after end')
+
+    if (this[DESTROYED]) {
+      this.emit('error', Object.assign(
+        new Error('Cannot call write after a stream was destroyed'),
+        { code: 'ERR_STREAM_DESTROYED' }
+      ))
+      return true
+    }
+
+    if (typeof encoding === 'function')
+      cb = encoding, encoding = 'utf8'
+
+    if (!encoding)
+      encoding = 'utf8'
+
+    const fn = this[ASYNC] ? defer : f => f()
+
+    // convert array buffers and typed array views into buffers
+    // at some point in the future, we may want to do the opposite!
+    // leave strings and buffers as-is
+    // anything else switches us into object mode
+    if (!this[OBJECTMODE] && !Buffer.isBuffer(chunk)) {
+      if (isArrayBufferView(chunk))
+        chunk = Buffer.from(chunk.buffer, chunk.byteOffset, chunk.byteLength)
+      else if (isArrayBuffer(chunk))
+        chunk = Buffer.from(chunk)
+      else if (typeof chunk !== 'string')
+        // use the setter so we throw if we have encoding set
+        this.objectMode = true
+    }
+
+    // handle object mode up front, since it's simpler
+    // this yields better performance, fewer checks later.
+    if (this[OBJECTMODE]) {
+      /* istanbul ignore if - maybe impossible? */
+      if (this.flowing && this[BUFFERLENGTH] !== 0)
+        this[FLUSH](true)
+
+      if (this.flowing)
+        this.emit('data', chunk)
+      else
+        this[BUFFERPUSH](chunk)
+
+      if (this[BUFFERLENGTH] !== 0)
+        this.emit('readable')
+
+      if (cb)
+        fn(cb)
+
+      return this.flowing
+    }
+
+    // at this point the chunk is a buffer or string
+    // don't buffer it up or send it to the decoder
+    if (!chunk.length) {
+      if (this[BUFFERLENGTH] !== 0)
+        this.emit('readable')
+      if (cb)
+        fn(cb)
+      return this.flowing
+    }
+
+    // fast-path writing strings of same encoding to a stream with
+    // an empty buffer, skipping the buffer/decoder dance
+    if (typeof chunk === 'string' &&
+        // unless it is a string already ready for us to use
+        !(encoding === this[ENCODING] && !this[DECODER].lastNeed)) {
+      chunk = Buffer.from(chunk, encoding)
+    }
+
+    if (Buffer.isBuffer(chunk) && this[ENCODING])
+      chunk = this[DECODER].write(chunk)
+
+    // Note: flushing CAN potentially switch us into not-flowing mode
+    if (this.flowing && this[BUFFERLENGTH] !== 0)
+      this[FLUSH](true)
+
+    if (this.flowing)
+      this.emit('data', chunk)
+    else
+      this[BUFFERPUSH](chunk)
+
+    if (this[BUFFERLENGTH] !== 0)
+      this.emit('readable')
+
+    if (cb)
+      fn(cb)
+
+    return this.flowing
+  }
+
+  read (n) {
+    if (this[DESTROYED])
+      return null
+
+    if (this[BUFFERLENGTH] === 0 || n === 0 || n > this[BUFFERLENGTH]) {
+      this[MAYBE_EMIT_END]()
+      return null
+    }
+
+    if (this[OBJECTMODE])
+      n = null
+
+    if (this.buffer.length > 1 && !this[OBJECTMODE]) {
+      if (this.encoding)
+        this.buffer = [this.buffer.join('')]
+      else
+        this.buffer = [Buffer.concat(this.buffer, this[BUFFERLENGTH])]
+    }
+
+    const ret = this[READ](n || null, this.buffer[0])
+    this[MAYBE_EMIT_END]()
+    return ret
+  }
+
+  [READ] (n, chunk) {
+    if (n === chunk.length || n === null)
+      this[BUFFERSHIFT]()
+    else {
+      this.buffer[0] = chunk.slice(n)
+      chunk = chunk.slice(0, n)
+      this[BUFFERLENGTH] -= n
+    }
+
+    this.emit('data', chunk)
+
+    if (!this.buffer.length && !this[EOF])
+      this.emit('drain')
+
+    return chunk
+  }
+
+  end (chunk, encoding, cb) {
+    if (typeof chunk === 'function')
+      cb = chunk, chunk = null
+    if (typeof encoding === 'function')
+      cb = encoding, encoding = 'utf8'
+    if (chunk)
+      this.write(chunk, encoding)
+    if (cb)
+      this.once('end', cb)
+    this[EOF] = true
+    this.writable = false
+
+    // if we haven't written anything, then go ahead and emit,
+    // even if we're not reading.
+    // we'll re-emit if a new 'end' listener is added anyway.
+    // This makes MP more suitable to write-only use cases.
+    if (this.flowing || !this[PAUSED])
+      this[MAYBE_EMIT_END]()
+    return this
+  }
+
+  // don't let the internal resume be overwritten
+  [RESUME] () {
+    if (this[DESTROYED])
+      return
+
+    this[PAUSED] = false
+    this[FLOWING] = true
+    this.emit('resume')
+    if (this.buffer.length)
+      this[FLUSH]()
+    else if (this[EOF])
+      this[MAYBE_EMIT_END]()
+    else
+      this.emit('drain')
+  }
+
+  resume () {
+    return this[RESUME]()
+  }
+
+  pause () {
+    this[FLOWING] = false
+    this[PAUSED] = true
+  }
+
+  get destroyed () {
+    return this[DESTROYED]
+  }
+
+  get flowing () {
+    return this[FLOWING]
+  }
+
+  get paused () {
+    return this[PAUSED]
+  }
+
+  [BUFFERPUSH] (chunk) {
+    if (this[OBJECTMODE])
+      this[BUFFERLENGTH] += 1
+    else
+      this[BUFFERLENGTH] += chunk.length
+    this.buffer.push(chunk)
+  }
+
+  [BUFFERSHIFT] () {
+    if (this.buffer.length) {
+      if (this[OBJECTMODE])
+        this[BUFFERLENGTH] -= 1
+      else
+        this[BUFFERLENGTH] -= this.buffer[0].length
+    }
+    return this.buffer.shift()
+  }
+
+  [FLUSH] (noDrain) {
+    do {} while (this[FLUSHCHUNK](this[BUFFERSHIFT]()))
+
+    if (!noDrain && !this.buffer.length && !this[EOF])
+      this.emit('drain')
+  }
+
+  [FLUSHCHUNK] (chunk) {
+    return chunk ? (this.emit('data', chunk), this.flowing) : false
+  }
+
+  pipe (dest, opts) {
+    if (this[DESTROYED])
+      return
+
+    const ended = this[EMITTED_END]
+    opts = opts || {}
+    if (dest === proc.stdout || dest === proc.stderr)
+      opts.end = false
+    else
+      opts.end = opts.end !== false
+    opts.proxyErrors = !!opts.proxyErrors
+
+    // piping an ended stream ends immediately
+    if (ended) {
+      if (opts.end)
+        dest.end()
+    } else {
+      this.pipes.push(!opts.proxyErrors ? new Pipe(this, dest, opts)
+        : new PipeProxyErrors(this, dest, opts))
+      if (this[ASYNC])
+        defer(() => this[RESUME]())
+      else
+        this[RESUME]()
+    }
+
+    return dest
+  }
+
+  unpipe (dest) {
+    const p = this.pipes.find(p => p.dest === dest)
+    if (p) {
+      this.pipes.splice(this.pipes.indexOf(p), 1)
+      p.unpipe()
+    }
+  }
+
+  addListener (ev, fn) {
+    return this.on(ev, fn)
+  }
+
+  on (ev, fn) {
+    const ret = super.on(ev, fn)
+    if (ev === 'data' && !this.pipes.length && !this.flowing)
+      this[RESUME]()
+    else if (ev === 'readable' && this[BUFFERLENGTH] !== 0)
+      super.emit('readable')
+    else if (isEndish(ev) && this[EMITTED_END]) {
+      super.emit(ev)
+      this.removeAllListeners(ev)
+    } else if (ev === 'error' && this[EMITTED_ERROR]) {
+      if (this[ASYNC])
+        defer(() => fn.call(this, this[EMITTED_ERROR]))
+      else
+        fn.call(this, this[EMITTED_ERROR])
+    }
+    return ret
+  }
+
+  get emittedEnd () {
+    return this[EMITTED_END]
+  }
+
+  [MAYBE_EMIT_END] () {
+    if (!this[EMITTING_END] &&
+        !this[EMITTED_END] &&
+        !this[DESTROYED] &&
+        this.buffer.length === 0 &&
+        this[EOF]) {
+      this[EMITTING_END] = true
+      this.emit('end')
+      this.emit('prefinish')
+      this.emit('finish')
+      if (this[CLOSED])
+        this.emit('close')
+      this[EMITTING_END] = false
+    }
+  }
+
+  emit (ev, data, ...extra) {
+    // error and close are only events allowed after calling destroy()
+    if (ev !== 'error' && ev !== 'close' && ev !== DESTROYED && this[DESTROYED])
+      return
+    else if (ev === 'data') {
+      return !data ? false
+        : this[ASYNC] ? defer(() => this[EMITDATA](data))
+        : this[EMITDATA](data)
+    } else if (ev === 'end') {
+      return this[EMITEND]()
+    } else if (ev === 'close') {
+      this[CLOSED] = true
+      // don't emit close before 'end' and 'finish'
+      if (!this[EMITTED_END] && !this[DESTROYED])
+        return
+      const ret = super.emit('close')
+      this.removeAllListeners('close')
+      return ret
+    } else if (ev === 'error') {
+      this[EMITTED_ERROR] = data
+      const ret = super.emit('error', data)
+      this[MAYBE_EMIT_END]()
+      return ret
+    } else if (ev === 'resume') {
+      const ret = super.emit('resume')
+      this[MAYBE_EMIT_END]()
+      return ret
+    } else if (ev === 'finish' || ev === 'prefinish') {
+      const ret = super.emit(ev)
+      this.removeAllListeners(ev)
+      return ret
+    }
+
+    // Some other unknown event
+    const ret = super.emit(ev, data, ...extra)
+    this[MAYBE_EMIT_END]()
+    return ret
+  }
+
+  [EMITDATA] (data) {
+    for (const p of this.pipes) {
+      if (p.dest.write(data) === false)
+        this.pause()
+    }
+    const ret = super.emit('data', data)
+    this[MAYBE_EMIT_END]()
+    return ret
+  }
+
+  [EMITEND] () {
+    if (this[EMITTED_END])
+      return
+
+    this[EMITTED_END] = true
+    this.readable = false
+    if (this[ASYNC])
+      defer(() => this[EMITEND2]())
+    else
+      this[EMITEND2]()
+  }
+
+  [EMITEND2] () {
+    if (this[DECODER]) {
+      const data = this[DECODER].end()
+      if (data) {
+        for (const p of this.pipes) {
+          p.dest.write(data)
+        }
+        super.emit('data', data)
+      }
+    }
+
+    for (const p of this.pipes) {
+      p.end()
+    }
+    const ret = super.emit('end')
+    this.removeAllListeners('end')
+    return ret
+  }
+
+  // const all = await stream.collect()
+  collect () {
+    const buf = []
+    if (!this[OBJECTMODE])
+      buf.dataLength = 0
+    // set the promise first, in case an error is raised
+    // by triggering the flow here.
+    const p = this.promise()
+    this.on('data', c => {
+      buf.push(c)
+      if (!this[OBJECTMODE])
+        buf.dataLength += c.length
+    })
+    return p.then(() => buf)
+  }
+
+  // const data = await stream.concat()
+  concat () {
+    return this[OBJECTMODE]
+      ? Promise.reject(new Error('cannot concat in objectMode'))
+      : this.collect().then(buf =>
+          this[OBJECTMODE]
+            ? Promise.reject(new Error('cannot concat in objectMode'))
+            : this[ENCODING] ? buf.join('') : Buffer.concat(buf, buf.dataLength))
+  }
+
+  // stream.promise().then(() => done, er => emitted error)
+  promise () {
+    return new Promise((resolve, reject) => {
+      this.on(DESTROYED, () => reject(new Error('stream destroyed')))
+      this.on('error', er => reject(er))
+      this.on('end', () => resolve())
+    })
+  }
+
+  // for await (let chunk of stream)
+  [ASYNCITERATOR] () {
+    const next = () => {
+      const res = this.read()
+      if (res !== null)
+        return Promise.resolve({ done: false, value: res })
+
+      if (this[EOF])
+        return Promise.resolve({ done: true })
+
+      let resolve = null
+      let reject = null
+      const onerr = er => {
+        this.removeListener('data', ondata)
+        this.removeListener('end', onend)
+        reject(er)
+      }
+      const ondata = value => {
+        this.removeListener('error', onerr)
+        this.removeListener('end', onend)
+        this.pause()
+        resolve({ value: value, done: !!this[EOF] })
+      }
+      const onend = () => {
+        this.removeListener('error', onerr)
+        this.removeListener('data', ondata)
+        resolve({ done: true })
+      }
+      const ondestroy = () => onerr(new Error('stream destroyed'))
+      return new Promise((res, rej) => {
+        reject = rej
+        resolve = res
+        this.once(DESTROYED, ondestroy)
+        this.once('error', onerr)
+        this.once('end', onend)
+        this.once('data', ondata)
+      })
+    }
+
+    return { next }
+  }
+
+  // for (let chunk of stream)
+  [ITERATOR] () {
+    const next = () => {
+      const value = this.read()
+      const done = value === null
+      return { value, done }
+    }
+    return { next }
+  }
+
+  destroy (er) {
+    if (this[DESTROYED]) {
+      if (er)
+        this.emit('error', er)
+      else
+        this.emit(DESTROYED)
+      return this
+    }
+
+    this[DESTROYED] = true
+
+    // throw away all buffered data, it's never coming out
+    this.buffer.length = 0
+    this[BUFFERLENGTH] = 0
+
+    if (typeof this.close === 'function' && !this[CLOSED])
+      this.close()
+
+    if (er)
+      this.emit('error', er)
+    else // if no error to emit, still reject pending promises
+      this.emit(DESTROYED)
+
+    return this
+  }
+
+  static isStream (s) {
+    return !!s && (s instanceof Minipass || s instanceof Stream ||
+      s instanceof EE && (
+        typeof s.pipe === 'function' || // readable
+        (typeof s.write === 'function' && typeof s.end === 'function') // writable
+      ))
+  }
+}