Function parseSourceMap

integrations/utils.ts:827–870

(opts: string | SourceMapOptions)

}

function parseSourceMap(opts: string | SourceMapOptions): SourceMap {
  if (typeof opts === 'string') {
    let lines = opts.trimEnd().split('\n')
    let comment = lines.at(-1) ?? ''
    let map = String(comment).match(SOURCE_MAP_COMMENT)?.[1] ?? null
    if (!map) throw new Error('No source map comment found')

    return parseSourceMap({
      map,
      content: lines.slice(0, -1).join('\n'),
      encoding: 'base64',
    })
  }

  let rawMap: RawSourceMap
  let content = opts.content

  if (typeof opts.map === 'object') {
    rawMap = opts.map as RawSourceMap
  } else {
    rawMap = JSON.parse(Buffer.from(opts.map, opts.encoding ?? 'utf-8').toString())
  }

  let map = new SourceMapConsumer(rawMap)
  let generatedTable = createLineTable(content)

  return {
    at(line: number, column: number) {
      let pos = map.originalPositionFor({ line, column })
      let source = pos.source ? map.sourceContentFor(pos.source) : null
      let originalTable = createLineTable(source ?? '')
      let originalOffset = originalTable.findOffset(pos)
      let generatedOffset = generatedTable.findOffset({ line, column })

      return {
        source: pos.source,
        original: source
          ? source.slice(originalOffset, originalOffset + 10).trim() + '...'
          : '(none)',
        generated: content.slice(generatedOffset, generatedOffset + 10).trim() + '...',
      }
    },
  }
}