Function unindent

src/string.ts:124–147

(str: TemplateStringsArray | string)

 * `
 */
export function unindent(str: TemplateStringsArray | string) {
  const lines = (typeof str === 'string' ? str : str[0]).split('\n')
  const whitespaceLines = lines.map(line => _reFullWs.test(line))

  const commonIndent = lines
    .reduce((min, line, idx) => {
      if (whitespaceLines[idx])
        return min
      const indent = line.match(/^\s*/)?.[0].length
      return indent === undefined ? min : Math.min(min, indent)
    }, Number.POSITIVE_INFINITY)

  let emptyLinesHead = 0
  while (emptyLinesHead < lines.length && whitespaceLines[emptyLinesHead])
    emptyLinesHead++
  let emptyLinesTail = 0
  while (emptyLinesTail < lines.length && whitespaceLines[lines.length - emptyLinesTail - 1])
    emptyLinesTail++

  return lines
    .slice(emptyLinesHead, lines.length - emptyLinesTail)
    .map(line => line.slice(commonIndent))
    .join('\n')
}