tsup/src/api-extractor.ts

import type {
  ExtractorResult,
  IConfigFile,
  IExtractorConfigPrepareOptions,
} from '@microsoft/api-extractor'
import path from 'path'
import { handleError } from './errors'
import {
  formatAggregationExports,
  formatDistributionExports,
  type ExportDeclaration,
} from './exports'
import { loadPkg } from './load'
import { createLogger } from './log'
import { Format, NormalizedOptions } from './options'
import {
  defaultOutExtension,
  ensureTempDeclarationDir,
  getApiExtractor,
  toAbsolutePath,
  writeFileSync,
} from './utils'

const logger = createLogger()

function rollupDtsFile(
  inputFilePath: string,
  outputFilePath: string,
  tsconfigFilePath: string
) {
  let cwd = process.cwd()
  let packageJsonFullPath = path.join(cwd, 'package.json')
  let configObject: IConfigFile = {
    mainEntryPointFilePath: inputFilePath,
    apiReport: {
      enabled: false,

      // `reportFileName` is not been used. It's just to fit the requirement of API Extractor.
      reportFileName: 'tsup-report.api.md',
    },
    docModel: { enabled: false },
    dtsRollup: {
      enabled: true,
      untrimmedFilePath: outputFilePath,
    },
    tsdocMetadata: { enabled: false },
    compiler: {
      tsconfigFilePath: tsconfigFilePath,
    },
    projectFolder: cwd,
  }
  const prepareOptions: IExtractorConfigPrepareOptions = {
    configObject,
    configObjectFullPath: undefined,
    packageJsonFullPath,
  }

  const imported = getApiExtractor()
  if (!imported) {
    throw new Error(
      `@microsoft/api-extractor is not installed. Please install it first.`
    )
  }
  const { ExtractorConfig, Extractor } = imported

  const extractorConfig = ExtractorConfig.prepare(prepareOptions)

  // Invoke API Extractor
  const extractorResult: ExtractorResult = Extractor.invoke(extractorConfig, {
    // Equivalent to the "--local" command-line parameter
    localBuild: true,

    // Equivalent to the "--verbose" command-line parameter
    showVerboseMessages: true,
  })

  if (!extractorResult.succeeded) {
    throw new Error(
      `API Extractor completed with ${extractorResult.errorCount} errors and ${extractorResult.warningCount} warnings when processing ${inputFilePath}`
    )
  }
}

async function rollupDtsFiles(
  options: NormalizedOptions,
  exports: ExportDeclaration[],
  format: Format
) {
  let declarationDir = ensureTempDeclarationDir()
  let outDir = options.outDir || 'dist'
  let pkg = await loadPkg(process.cwd())
  let dtsExtension = defaultOutExtension({ format, pkgType: pkg.type }).dts

  let dtsInputFilePath = path.join(
    declarationDir,
    '_tsup-dts-aggregation' + dtsExtension
  )
  // @microsoft/api-extractor doesn't support `.d.mts` and `.d.cts` file as a
  // entrypoint yet. So we replace the extension here as a temporary workaround.
  //
  // See the issue for more details:
  // https://github.com/microsoft/rushstack/pull/4196
  dtsInputFilePath = dtsInputFilePath
    .replace(/\.d\.mts$/, '.dmts.d.ts')
    .replace(/\.d\.cts$/, '.dcts.d.ts')

  let dtsOutputFilePath = path.join(outDir, '_tsup-dts-rollup' + dtsExtension)

  writeFileSync(
    dtsInputFilePath,
    formatAggregationExports(exports, declarationDir)
  )

  rollupDtsFile(
    dtsInputFilePath,
    dtsOutputFilePath,
    options.tsconfig || 'tsconfig.json'
  )

  for (let [out, sourceFileName] of Object.entries(
    options.experimentalDts!.entry
  )) {
    sourceFileName = toAbsolutePath(sourceFileName)
    const outFileName = path.join(outDir, out + dtsExtension)

    writeFileSync(
      outFileName,
      formatDistributionExports(exports, outFileName, dtsOutputFilePath)
    )
  }
}

export async function runDtsRollup(
  options: NormalizedOptions,
  exports?: ExportDeclaration[]
) {
  try {
    const start = Date.now()
    const getDuration = () => {
      return `${Math.floor(Date.now() - start)}ms`
    }
    logger.info('dts', 'Build start')

    if (!exports) {
      throw new Error('Unexpected internal error: dts exports is not define')
    }
    for (const format of options.format) {
      await rollupDtsFiles(options, exports, format)
    }
    logger.success('dts', `⚡️ Build success in ${getDuration()}`)
  } catch (error) {
    handleError(error)
    logger.error('dts', 'Build error')
  }
}