Nuxt/packages/builder/src/context/build.js

export default class BuildContext {
  constructor(builder) {
    this._builder = builder
    this.nuxt = builder.nuxt
    this.options = builder.nuxt.options
    this.isStatic = false
  }

  get buildOptions() {
    return this.options.build
  }

  get plugins() {
    return this._builder.plugins
  }
}