Method getMainModule

tools/project-context.js:1700–1705

(
    arch,
    mainModulesByArch = this.getMainModulesByArch(),
  )

  // defined, then because mapWhereToArch("client") === "web", and "web"
  // matches web.browser, return this.config.mainModule.client.
  getMainModule(
    arch,
    mainModulesByArch = this.getMainModulesByArch(),
  ) {
    return this._getEntryModule(arch, mainModulesByArch);
  }

  // Analogous to getMainModulesByArch, except for this.config.testModule.
  getTestModulesByArch() {