Function handler

packages/vite/src/node/plugins/worker.ts:345–387

(code, id)

      },
      order: 'post',
      async handler(code, id) {
        // import.meta is unavailable in the IIFE worker, so we need to replace it
        if (this.environment.config.worker.format === 'iife') {
          await init

          let imports: readonly ImportSpecifier[]
          try {
            imports = parse(code)[0]
          } catch {
            // ignore if parse fails
            return
          }

          let injectedImportMeta = false
          let s: MagicString | undefined
          for (const { s: start, e: end, d: dynamicIndex } of imports) {
            // is import.meta
            if (dynamicIndex === -2) {
              const prop = code.slice(end, end + 4)
              if (prop === '.url') {
                s ||= new MagicString(code)
                s.overwrite(start, end + 4, 'self.location.href')
              } else {
                s ||= new MagicString(code)
                if (!injectedImportMeta) {
                  s.prepend(
                    'const _vite_importMeta = { url: self.location.href };\n',
                  )
                  injectedImportMeta = true
                }
                s.overwrite(start, end, '_vite_importMeta')
              }
            }
          }

          if (!s) return

          return {
            code: s.toString(),
            map: s.generateMap({ hires: 'boundary', source: id }),
          }
        }
      },
    },
  }
}