yarn start実行時のstyleguideフェーズでのエラー

[sa9sha9]

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内容

[18:23:08] Using gulpfile ~/Desktop/sd-dev-training/gulpset/gulpfile.js
[18:23:08] Starting 'default'...
[18:23:08] Starting 'clean'...
[18:23:08] Finished 'clean' after 7.4 ms
[18:23:08] Starting 'copy'...
[18:23:08] Starting 'stylelint'...
[18:23:08] Starting 'eslint'...
[18:23:08] Starting 'imagemin'...
[18:23:08] Starting 'sass'...
[18:23:08] Starting 'scripts'...
[18:23:08] Starting 'jsx-static'...
[18:23:08] Starting 'styleguide'...
[18:23:10] 'styleguide' errored after 1.86 s
[18:23:10] AssertionError [ERR_ASSERTION]: HappyPack: Option 'verbose' must be of type 'boolean' not 'string'.
    at /Users/shunsuke_sakurai/Desktop/sd-dev-training/gulpset/node_modules/happypack/lib/OptionParser.js:59:7
    at Array.reduce (<anonymous>)
    at parseAndValidateOptions (/Users/shunsuke_sakurai/Desktop/sd-dev-training/gulpset/node_modules/happypack/lib/OptionParser.js:31:30)
    at new HappyPlugin (/Users/shunsuke_sakurai/Desktop/sd-dev-training/gulpset/node_modules/happypack/lib/HappyPlugin.js:27:17)
    at init (/Users/shunsuke_sakurai/Desktop/sd-dev-training/gulpset/node_modules/webpack-chain/src/Plugin.js:14:18)
    at Object.toConfig (/Users/shunsuke_sakurai/Desktop/sd-dev-training/gulpset/node_modules/webpack-chain/src/Plugin.js:60:22)
    at clean.Object.assign.plugins.plugins.values.map.plugin (/Users/shunsuke_sakurai/Desktop/sd-dev-training/gulpset/node_modules/webpack-chain/src/Config.js:131:61)
    at Array.map (<anonymous>)
    at module.exports.toConfig (/Users/shunsuke_sakurai/Desktop/sd-dev-training/gulpset/node_modules/webpack-chain/src/Config.js:131:40)
    at Bundler.config (/Users/shunsuke_sakurai/Desktop/sd-dev-training/gulpset/node_modules/docz-core/dist/index.js:1:104511)
    at <anonymous>
    at process._tickDomainCallback (internal/process/next_tick.js:229:7)
[18:23:10] 'default' errored after 1.87 s
[18:23:10] The following tasks did not complete: copy, stylelint, eslint, imagemin, sass, scripts, jsx-static
[18:23:10] Did you forget to signal async completion?
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

実行環境

node: v8.16.0
yarn: 1.15.2

再現手順

branch v4.0でyarn start

対処

gulpfile.jsよりstyleguideフェーズをコメントアウト