Function transformFn

packages/ts-transformer/transform.ts:967–988

  const transformFn: typescript.TransformerFactory<
    typescript.SourceFile
  > = ctx => {
    return sf => {
      const pragmaResult = PRAGMA_REGEX.exec(sf.text)
      if (pragmaResult) {
        debug('Pragma found', pragmaResult)
        const [, pragma, kvString] = pragmaResult
        if (pragma === opts.pragma) {
          const kvs = kvString.split(' ')
          const result: Record<string, string> = {}
          for (const kv of kvs) {
            const [k, v] = kv.split(':')
            result[k] = v
          }
          debug('Pragma extracted', result)
          if (typeof opts.onMetaExtracted === 'function') {
            opts.onMetaExtracted(sf.fileName, result)
          }
        }
      }
      return ts.visitEachChild(sf, getVisitor(ts, ctx, sf, opts), ctx)
    }
  }

  return transformFn
}