yarn-error.log

Arguments: 
  /usr/local/Cellar/node/9.9.0/bin/node /Users/zk/dev/sake/sake-yarn/node_modules/.bin/yarn upgrade

PATH: 
  /Users/zk/dev/sake/sake-yarn/node_modules/.bin:/Users/zk/work/hanzo/platform/sdk:/Users/zk/work/hanzo/platform/sdk/gopath/bin:/Users/zk/.bin:/Users/zk/.ellipsis/bin:/Users/zk/.private/bin:/Users/zk/.cabal/bin:/Users/zk/Library/Haskell/bin:/Users/zk/go/bin:/Users/zk/.zsh/plugins/osx/lib:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin:/Users/zk/.zsh/plugins/git/commands:/Users/zk/.zsh/plugins/theme/bin:/usr/local/opt/google-cloud-sdk/bin:/Users/zk/.cargo/bin

Yarn version: 
  1.5.1

Node version: 
  9.9.0

Platform: 
  darwin x64

npm manifest: 
  {
    "name": "sake-yarn",
    "version": "0.1.3",
    "description": "Add `yarn` tasks to your Sakefile",
    "main": "lib/sake-yarn.js",
    "module": "lib/sake-yarn.mjs",
    "files": [
      "lib/",
      "src/"
    ],
    "devDependencies": {
      "coffeescript": "^2.2.3",
      "sake-bundle": "^0.6.7",
      "sake-cli": "^0.6.5",
      "sake-core": "^1.6.3",
      "sake-outdated": "^0.2.2",
      "sake-publish": "^0.1.17",
      "sake-test": "^0.2.1",
      "sake-version": "^0.1.19"
    },
    "scripts": {
      "build": "sake build",
      "prepublishOnly": "sake build",
      "pretest": "sake build",
      "test": "sake test"
    },
    "repository": {
      "type": "git",
      "url": "git+https://github.com/sakejs/sake-yarn.git"
    },
    "keywords": [
      "npm",
      "sake",
      "tasks",
      "yarn"
    ],
    "author": "Hanzo, Inc. <hi@hanzo.io",
    "license": "BSD-3-Clause",
    "bugs": {
      "url": "https://github.com/sakejs/sake-yarn/issues"
    },
    "homepage": "https://github.com/sakejs/sake-yarn#readme"
  }

yarn manifest: 
  No manifest

Lockfile: 
  No lockfile

Trace: 
  Error: No lockfile in this directory. Run `yarn install` to generate one.
      at new MessageError (/Users/zk/dev/sake/sake-yarn/node_modules/yarn/lib/cli.js:186:110)
      at /Users/zk/dev/sake/sake-yarn/node_modules/yarn/lib/cli.js:89389:13
      at <anonymous>