express-response-middleware/dist/esm/index.mjs.map

Transform an express response

{"version":3,"file":"index.mjs","sources":["../../src/utils/asyncLocalStorage.ts","../../src/utils/errorHandler.ts","../../src/jsonMiddleware.ts","../../src/endMiddleware.ts","../../src/writeMiddleware.ts","../../src/jsonpMiddleware.ts"],"sourcesContent":["import { AsyncLocalStorage } from 'node:async_hooks';\n\nexport const isInSend = new AsyncLocalStorage<boolean>();\n","import type { ErrorRequestHandler } from 'express';\n\nexport const errorHandler: ErrorRequestHandler = (err, _req, res, _next) => {\n  res\n    .status(500)\n    .set('content-language', 'en')\n    .json({ message: err.message })\n    .end();\n};\n","import type { Request, RequestHandler, Response } from 'express';\nimport { isInSend } from './utils/asyncLocalStorage.js';\nimport { errorHandler } from './utils/errorHandler.js';\n\nexport type TransformJson<T = unknown, R = T> = (\n  body: T,\n  request: Request,\n  response: Response,\n) => R | Promise<R>;\n\nexport const jsonMiddleware =\n  <T = unknown>(fn: TransformJson<T>): RequestHandler =>\n  (req, res, next) => {\n    const originalJsonFn = res.json;\n    const originalSendFn = res.send;\n\n    res.send = function (this: Response) {\n      return isInSend.run(true, () =>\n        originalSendFn.apply(this, arguments as any),\n      );\n    };\n\n    res.json = function (this: Response, json) {\n      const originalEndFn = res.end;\n\n      if (res.headersSent) return res;\n\n      let mayBePromise: T | Promise<T>;\n      try {\n        mayBePromise = fn(json, req, res);\n      } catch (e) {\n        res.json = originalJsonFn;\n        errorHandler(e, req, res, next);\n        return res;\n      }\n\n      if (mayBePromise instanceof Promise) {\n        mayBePromise\n          .then((result) => {\n            if (res.headersSent) return;\n            res.end = originalEndFn;\n\n            originalJsonFn.call(this, result === undefined ? json : result);\n          })\n          .catch((e) => {\n            res.json = originalJsonFn;\n            res.end = originalEndFn;\n            errorHandler(e, req, res, next);\n          });\n\n        // Prevent end being called wile promise still running\n        res.end = function (this: Response) {\n          //  Res.send will call Res.end, when send is call inside the middleware, do it actually\n          if (isInSend.getStore()) {\n            originalEndFn.apply(this, arguments as any);\n          }\n          return res;\n        };\n      } else {\n        const result = mayBePromise;\n\n        if (res.headersSent) return res;\n\n        originalJsonFn.call(this, result === undefined ? json : result);\n      }\n\n      return res;\n    };\n\n    next();\n  };\n","import type { Request, RequestHandler, Response } from 'express';\nimport { errorHandler } from './utils/errorHandler.js';\n\nexport type TransformEnd<T = unknown> = (\n  request: Request,\n  response: Response,\n) => T | Promise<T>;\n\nexport const endMiddleware =\n  <T = unknown>(fn: TransformEnd<T>): RequestHandler =>\n  (req, res, next) => {\n    const originalEndFn = res.end;\n\n    res.end = function (this: Response) {\n      if (res.headersSent) return originalEndFn.apply(this, arguments as any);\n\n      let mayBePromise: T | Promise<T>;\n      try {\n        mayBePromise = fn(req, res);\n      } catch (e) {\n        res.end = originalEndFn;\n        errorHandler(e, req, res, next);\n        return res;\n      }\n\n      if (mayBePromise instanceof Promise) {\n        mayBePromise\n          .then(() => {\n            if (res.headersSent) {\n              console.error(\n                'sending response while in endMiddleware is undefined behaviour',\n              );\n              return;\n            }\n\n            originalEndFn.apply(this, arguments as any);\n          })\n          .catch((e) => {\n            res.end = originalEndFn;\n            errorHandler(e, req, res, next);\n          });\n\n        res.end = function (this: Response) {\n          return res;\n        };\n      } else {\n        if (res.headersSent) {\n          console.error(\n            'sending response while in endMiddleware is undefined behaviour',\n          );\n          return res;\n        }\n\n        return originalEndFn.apply(this, arguments as any);\n      }\n\n      return res;\n    };\n\n    next();\n  };\n","import type { Request, RequestHandler, Response } from 'express';\nimport { errorHandler } from './utils/errorHandler.js';\n\nexport type TransformChunk = (\n  chunk: string | Buffer,\n  encoding: string | null,\n  request: Request,\n  response: Response,\n) => void | string | Buffer | Promise<void> | Promise<string> | Promise<Buffer>;\n\nexport const writeMiddleware =\n  (fn: TransformChunk): RequestHandler =>\n  (req, res, next) => {\n    const originalWrite = res.write;\n    const originalEndFn = res.end;\n\n    res.write = function (this: Response, chunk) {\n      if (res.writableEnded) return false;\n\n      let mayBePromise: ReturnType<TransformChunk>;\n      try {\n        mayBePromise = fn(\n          chunk,\n          // Since `encoding` is an optional argument to `res.write`,\n          // make sure it is a string and not actually the callback.\n          // biome-ignore lint/style/noArguments: pass argument type\n          typeof arguments[1] === 'string' ? arguments[1] : null,\n          req,\n          res,\n        );\n      } catch (e) {\n        errorHandler(e, req, res, next);\n        return false;\n      }\n\n      if (mayBePromise instanceof Promise) {\n        mayBePromise\n          .then((result) => {\n            res.end = originalEndFn;\n\n            if (res.writableEnded) return false;\n\n            // biome-ignore lint/style/noArguments: pass argument type\n            arguments[0] = result === undefined ? chunk : result;\n\n            // biome-ignore lint/style/noArguments: pass argument type\n            const writeResponse = originalWrite.apply(res, arguments as any);\n\n            if (res.__isEnd) res.end();\n\n            return writeResponse;\n          })\n          .catch((e) => {\n            res.end = originalEndFn;\n            errorHandler(e, req, res, next);\n          });\n\n        res.end = function (this: Response) {\n          this.__isEnd = true;\n          return res;\n        };\n        return false;\n      }\n\n      const result = mayBePromise;\n      if (res.writableEnded) return false;\n\n      // biome-ignore lint/style/noArguments: pass argument type\n      arguments[0] = result === undefined ? chunk : result;\n\n      // biome-ignore lint/style/noArguments: pass argument type\n      return originalWrite.apply(res, arguments as any);\n    };\n\n    next();\n  };\n","import { AsyncLocalStorage } from 'node:async_hooks';\nimport type { Request, RequestHandler, Response } from 'express';\nimport { errorHandler } from './utils/errorHandler.js';\n\nexport type TransformJsonp<T = unknown, R = T> = (\n  body: T,\n  request: Request,\n  response: Response,\n) => R | Promise<R>;\n\nconst isInSend = new AsyncLocalStorage<boolean>();\n\nexport const jsonpMiddleware =\n  <T = unknown>(fn: TransformJsonp<T>): RequestHandler =>\n  (req, res, next) => {\n    const originalJsonpFn = res.jsonp;\n    const originalSendFn = res.send;\n\n    res.send = function (this: Response) {\n      return isInSend.run(true, () =>\n        originalSendFn.apply(this, arguments as any),\n      );\n    };\n\n    res.jsonp = function (this: Response, json) {\n      const originalEndFn = res.end;\n\n      if (res.headersSent) return res;\n\n      let mayBePromise: T | Promise<T>;\n      try {\n        mayBePromise = fn(json, req, res);\n      } catch (e) {\n        res.json = originalJsonpFn;\n        errorHandler(e, req, res, next);\n        return res;\n      }\n\n      if (mayBePromise instanceof Promise) {\n        mayBePromise\n          .then((result) => {\n            if (res.headersSent) return;\n            res.end = originalEndFn;\n\n            originalJsonpFn.call(this, result === undefined ? json : result);\n          })\n          .catch((e) => {\n            res.jsonp = originalJsonpFn;\n            res.end = originalEndFn;\n            errorHandler(e, req, res, next);\n          });\n\n        // Prevent end being called wile promise still running\n        res.end = function (this: Response) {\n          //  Res.send will call Res.end, when send is call inside the middleware, do it actually\n          if (isInSend.getStore()) {\n            originalEndFn.apply(this, arguments as any);\n          }\n          return res;\n        };\n      } else {\n        const result = mayBePromise;\n\n        if (res.headersSent) return res;\n\n        originalJsonpFn.call(this, result === undefined ? json : result);\n      }\n\n      return res;\n    };\n\n    next();\n  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