index.ts

import path from 'path'
import fs from 'fs'
import { Worker } from 'worker_threads'
import type { Buildable, MarkRequired } from 'ts-essentials'
import { removeFiles, debouncePromise, slash, MaybePromise } from './utils'
import { loadTsupConfig } from './load'
import glob from 'globby'
import { loadTsConfig } from 'bundle-require'
import { handleError, PrettyError } from './errors'
import type { ChildProcess } from 'child_process'
import execa from 'execa'
import kill from 'tree-kill'
import { version } from '../package.json'
import { createLogger, setSilent } from './log'
import { NormalizedOptions, Format, Options } from './options'
import { runEsbuild } from './esbuild'
import { shebang } from './plugins/shebang'
import { cjsSplitting } from './plugins/cjs-splitting'
import { PluginContainer } from './plugin'
import { es5 } from './plugins/es5'
import { sizeReporter } from './plugins/size-reporter'
import { treeShakingPlugin } from './plugins/tree-shaking'

export type { Format, Options, NormalizedOptions }

export const defineConfig = (
  options:
    | Options
    | Options[]
    | ((
      /** The options derived from CLI flags */
      overrideOptions: Options
    ) => MaybePromise<Options | Options[]>)
) => options

const killProcess = ({
  pid,
  signal = 'SIGTERM',
}: {
  pid: number
  signal?: string | number
}) =>
  new Promise<unknown>((resolve) => {
    kill(pid, signal, resolve)
  })

const normalizeOptions = async (
  logger: ReturnType<typeof createLogger>,
  optionsFromConfigFile: Options | undefined,
  optionsOverride: Options
) => {
  const _options = {
    ...optionsFromConfigFile,
    ...optionsOverride,
  }
  const options: Buildable<NormalizedOptions> = {
    target: 'node14',
    outDir: 'dist',
    ..._options,
    format:
      typeof _options.format === 'string'
        ? [_options.format as Format]
        : _options.format || ['cjs'],
    dts:
      typeof _options.dts === 'boolean'
        ? _options.dts
          ? {}
          : undefined
        : typeof _options.dts === 'string'
          ? { entry: _options.dts }
          : _options.dts,
  }

  setSilent(options.silent)

  const entry = options.entry || options.entryPoints

  if (!entry || Object.keys(entry).length === 0) {
    throw new PrettyError(`No input files, try "tsup <your-file>" instead`)
  }

  if (Array.isArray(entry)) {
    options.entry = await glob(entry)
    // Ensure entry exists
    if (!options.entry || options.entry.length === 0) {
      throw new PrettyError(`Cannot find ${entry}`)
    } else {
      logger.info('CLI', `Building entry: ${options.entry.join(', ')}`)
    }
  } else {
    Object.keys(entry).forEach((alias) => {
      const filename = entry[alias]!
      if (!fs.existsSync(filename)) {
        throw new PrettyError(`Cannot find ${alias}: ${filename}`)
      }
    })
    options.entry = entry
    logger.info('CLI', `Building entry: ${JSON.stringify(entry)}`)
  }

  const tsconfig = loadTsConfig(process.cwd(), options.tsconfig)
  if (tsconfig) {
    logger.info(
      'CLI',
      `Using tsconfig: ${path.relative(process.cwd(), tsconfig.path)}`
    )
    options.tsconfig = tsconfig.path
    options.tsconfigResolvePaths = tsconfig.data?.compilerOptions?.paths || {}
    options.tsconfigDecoratorMetadata =
      tsconfig.data?.compilerOptions?.emitDecoratorMetadata
  } else if (options.tsconfig) {
    throw new PrettyError(`Cannot find tsconfig: ${options.tsconfig}`)
  }

  return options as NormalizedOptions
}

export async function build(_options: Options) {
  const config =
    _options.config === false
      ? {}
      : await loadTsupConfig(
        process.cwd(),
        _options.config === true ? undefined : _options.config
      )

  const configData =
    typeof config.data === 'function'
      ? await config.data(_options)
      : config.data

  await Promise.all(
    [...(Array.isArray(configData) ? configData : [configData])].map(
      async (item) => {
        const logger = createLogger(item?.name)
        const options = await normalizeOptions(logger, item, _options)

        logger.info('CLI', `tsup v${version}`)

        if (config.path) {
          logger.info('CLI', `Using tsup config: ${config.path}`)
        }

        if (options.watch) {
          logger.info('CLI', 'Running in watch mode')
        }

        const dtsTask = async () => {
          if (options.dts) {
            await new Promise<void>((resolve, reject) => {
              const worker = new Worker(path.join(__dirname, './rollup.js'))
              worker.postMessage({
                configName: item?.name,
                options: {
                  ...options, // functions cannot be cloned
                  banner: undefined,
                  footer: undefined,
                  esbuildPlugins: undefined,
                  esbuildOptions: undefined,
                  plugins: undefined,
                  treeshake: undefined,
                },
              })
              worker.on('message', (data) => {
                if (data === 'error') {
                  reject(new Error('error occured in dts build'))
                } else if (data === 'success') {
                  resolve()
                }
              })
            })
          }
        }

        const otherTasks = async () => {
          if (!options.dts?.only) {
            let existingOnSuccess: ChildProcess | undefined
            /** Files imported by the entry */
            const buildDependencies: Set<string> = new Set()

            const killPreviousProcess = async () => {
              if (existingOnSuccess) {
                await killProcess({
                  pid: existingOnSuccess.pid,
                })
                existingOnSuccess = undefined
              }
            }

            const debouncedBuildAll = debouncePromise(
              () => {
                return buildAll()
              },
              100,
              handleError
            )

            const buildAll = async () => {
              const killPromise = killPreviousProcess()
              // Store previous build dependencies in case the build failed
              // So we can restore it
              const previousBuildDependencies = new Set(buildDependencies)
              buildDependencies.clear()

              if (options.clean) {
                const extraPatterns = Array.isArray(options.clean)
                  ? options.clean
                  : []
                await removeFiles(
                  ['**/*', '!**/*.d.ts', ...extraPatterns],
                  options.outDir
                )
                logger.info('CLI', 'Cleaning output folder')
              }

              const css: Map<string, string> = new Map()
              await Promise.all([
                ...options.format.map(async (format, index) => {
                  const pluginContainer = new PluginContainer([
                    shebang(),
                    ...(options.plugins || []),
                    treeShakingPlugin({
                      treeshake: options.treeshake,
                    }),
                    cjsSplitting(),
                    es5(),
                    sizeReporter(),
                  ])
                  await pluginContainer.buildStarted()
                  await runEsbuild(options, {
                    pluginContainer,
                    format,
                    css: index === 0 || options.injectStyle ? css : undefined,
                    logger,
                    buildDependencies,
                  }).catch((error) => {
                    previousBuildDependencies.forEach((v) =>
                      buildDependencies.add(v)
                    )
                    throw error
                  })
                }),
              ])
              await killPromise
              if (options.onSuccess) {
                existingOnSuccess = execa(options.onSuccess, {
                  shell: true,
                  stdio: 'inherit',
                })
              }
            }

            const startWatcher = async () => {
              if (!options.watch) return

              const { watch } = await import('chokidar')

              const customIgnores = options.ignoreWatch
                ? Array.isArray(options.ignoreWatch)
                  ? options.ignoreWatch
                  : [options.ignoreWatch]
                : []

              const ignored = [
                '**/{.git,node_modules}/**',
                options.outDir,
                ...customIgnores,
              ]

              const watchPaths =
                typeof options.watch === 'boolean'
                  ? '.'
                  : Array.isArray(options.watch)
                    ? options.watch.filter(
                      (path): path is string => typeof path === 'string'
                    )
                    : options.watch

              logger.info(
                'CLI',
                `Watching for changes in ${Array.isArray(watchPaths)
                  ? watchPaths.map((v) => '"' + v + '"').join(' | ')
                  : '"' + watchPaths + '"'
                }`
              )
              logger.info(
                'CLI',
                `Ignoring changes in ${ignored
                  .map((v) => '"' + v + '"')
                  .join(' | ')}`
              )

              const watcher = watch(watchPaths, {
                ignoreInitial: true,
                ignorePermissionErrors: true,
                ignored,
              })
              watcher.on('all', (type, file) => {
                file = slash(file)
                if (!buildDependencies.has(file)) return

                logger.info('CLI', `Change detected: ${type} ${file}`)
                debouncedBuildAll()
              })
            }

            logger.info('CLI', `Target: ${options.target}`)

            await buildAll()

            startWatcher()
          }
        }

        await Promise.all([dtsTask(), otherTasks()])
      }
    )
  )
}