TS Record类型

Record<Keys, Type>类型。看vue3源码发现这个

function createBlock(
  node: ElementNode,
  source: string,
  pad: SFCParseOptions['pad'],
): SFCBlock {
  const type = node.tag
  const loc = node.innerLoc!
  // 这里Record<string, string | true>
  const attrs: Record<string, string | true> = {}
  const block: SFCBlock = {
    type,
    content: source.slice(loc.start.offset, loc.end.offset),
    loc,
    attrs,
  }
  if (pad) {
    block.content = padContent(source, block, pad) + block.content
  }
  node.props.forEach(p => {
    if (p.type === NodeTypes.ATTRIBUTE) {
      const name = p.name
      attrs[name] = p.value ? p.value.content || true : true
      if (name === 'lang') {
        block.lang = p.value && p.value.content
      } else if (name === 'src') {
        block.src = p.value && p.value.content
      } else if (type === 'style') {
        if (name === 'scoped') {
          ;(block as SFCStyleBlock).scoped = true
        } else if (name === 'module') {
          ;(block as SFCStyleBlock).module = attrs[name]
        }
      } else if (type === 'script' && name === 'setup') {
        ;(block as SFCScriptBlock).setup = attrs.setup
      }
    }
  })
  return block
}

官方文档解释：建立一个对象类型它的属性keys是Keys,属性值是Type， 这个类型可以用来映射一个类型的属性到另一个属性。 www.typescriptlang.org/docs/handbo…