Function create

packages/typescript-plugin/src/index.ts:10–118

(info: tslib.server.PluginCreateInfo)

  const ts = modules.typescript

  function create(info: tslib.server.PluginCreateInfo): tslib.LanguageService {
    const log = (msg: string) =>
      info.project.projectService.logger.info(`[@payloadcms/typescript-plugin] ${msg}`)

    log('Plugin initializing')

    const baseDirConfig: string | undefined = info.config?.baseDir
    const baseDirCache = new Map<string, string | undefined>()
    const sys = info.serverHost || ts.sys

    const proxy: tslib.LanguageService = Object.create(null)

    for (const k of Object.keys(info.languageService) as Array<keyof tslib.LanguageService>) {
      const x = info.languageService[k]!
      // @ts-expect-error - decorator pattern for language service proxy
      proxy[k] = (...args: Array<{}>) => x.apply(info.languageService, args)
    }

    function getBaseDir(fileName: string): string | undefined {
      if (baseDirConfig) {
        const projectDir = info.project.getCurrentDirectory()
        return ts.sys.resolvePath(projectDir + '/' + baseDirConfig)
      }

      const cached = baseDirCache.get(fileName)
      if (cached !== undefined) {
        return cached
      }

      const detected = findPayloadConfigDir(sys, fileName)
      baseDirCache.set(fileName, detected)

      if (detected) {
        log(`Detected baseDir: ${detected} (from payload config near ${fileName})`)
      }

      return detected
    }

    proxy.getSemanticDiagnostics = (fileName) => {
      const prior = info.languageService.getSemanticDiagnostics(fileName)

      const program = info.languageService.getProgram()
      if (!program) {
        return prior
      }

      const sourceFile = program.getSourceFile(fileName)
      if (!sourceFile) {
        return prior
      }

      const checker = program.getTypeChecker()
      const baseDir = getBaseDir(fileName)
      const additional = getPayloadDiagnostics(ts, sourceFile, checker, program, baseDir)

      return [...prior, ...additional]
    }