Function overwriteAttrValue

packages/vite/src/node/plugins/html.ts:257–281

(
  s: MagicString,
  sourceCodeLocation: Token.Location,
  newValue: string,
)

const attrValueStartRE = /=\s*(.)/

export function overwriteAttrValue(
  s: MagicString,
  sourceCodeLocation: Token.Location,
  newValue: string,
): MagicString {
  const srcString = s.slice(
    sourceCodeLocation.startOffset,
    sourceCodeLocation.endOffset,
  )
  const valueStart = attrValueStartRE.exec(srcString)
  if (!valueStart) {
    // overwrite attr value can only be called for a well-defined value
    throw new Error(
      `[vite:html] internal error, failed to overwrite attribute value`,
    )
  }
  const wrapOffset = valueStart[1] === '"' || valueStart[1] === "'" ? 1 : 0
  const valueOffset = valueStart.index! + valueStart[0].length - 1
  s.update(
    sourceCodeLocation.startOffset + valueOffset + wrapOffset,
    sourceCodeLocation.endOffset - wrapOffset,
    newValue,
  )
  return s
}

export function removeViteIgnoreAttr(
  s: MagicString,