Function options

packages/vite/src/node/plugins/define.ts:123–131

(option)

        return {
          name: 'vite:define',
          options(option) {
            const [define, _pattern, importMetaEnvVal] = getPattern(
              this.environment,
            )
            define['import.meta.env'] = importMetaEnvVal
            define['import.meta.env.*'] = 'undefined'
            option.transform ??= {}
            option.transform.define = { ...option.transform.define, ...define }
          },
        }
      }
      return true