webpack and webpack --watch will get different output

[libla]

Bug report

I use expose-loader in webpack5, and I found when webpack --watch is running and the file changed, will output different with webpack, the combined filename without "-exposed" suffix. I create a demo for this: https://github.com/libla/expose-loader-demo.git

Actual Behavior

One of the outputs is

/******/ (() => { // webpackBootstrap
/******/    var __webpack_modules__ = ({

/***/ "./src/test-exposed.ts":
/*!*****************************!*\
  !*** ./src/test-exposed.ts ***!
  \*****************************/
/***/ ((module, __unused_webpack_exports, __webpack_require__) => {

var ___EXPOSE_LOADER_IMPORT___ = __webpack_require__(/*! -!../node_modules/ts-loader/index.js!./test.ts */ "./node_modules/ts-loader/index.js!./src/test.ts");
var ___EXPOSE_LOADER_GET_GLOBAL_THIS___ = __webpack_require__(/*! ../node_modules/expose-loader/dist/runtime/getGlobalThis.js */ "./node_modules/expose-loader/dist/runtime/getGlobalThis.js");
var ___EXPOSE_LOADER_GLOBAL_THIS___ = ___EXPOSE_LOADER_GET_GLOBAL_THIS___;
___EXPOSE_LOADER_GLOBAL_THIS___["test"] = ___EXPOSE_LOADER_IMPORT___;
module.exports = ___EXPOSE_LOADER_IMPORT___;

/***/ }),

/***/ "./node_modules/expose-loader/dist/runtime/getGlobalThis.js":
/*!******************************************************************!*\
  !*** ./node_modules/expose-loader/dist/runtime/getGlobalThis.js ***!
  \******************************************************************/
/***/ ((module, __unused_webpack_exports, __webpack_require__) => {

"use strict";

// eslint-disable-next-line func-names
module.exports = function () {
  if (typeof globalThis === "object") {
    return globalThis;
  }

  var g;

  try {
    // This works if eval is allowed (see CSP)
    // eslint-disable-next-line no-new-func
    g = this || new Function("return this")();
  } catch (e) {
    // This works if the window reference is available
    if (typeof window === "object") {
      return window;
    } // This works if the self reference is available

    if (typeof self === "object") {
      return self;
    } // This works if the global reference is available

    if (typeof __webpack_require__.g !== "undefined") {
      return __webpack_require__.g;
    }
  }

  return g;
}();

/***/ }),

/***/ "./src/main.ts":
/*!*********************!*\
  !*** ./src/main.ts ***!
  \*********************/
/***/ ((__unused_webpack_module, __webpack_exports__, __webpack_require__) => {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony import */ var _test__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(/*! ./test */ "./src/test-exposed.ts");
/* harmony import */ var _test__WEBPACK_IMPORTED_MODULE_0___default = /*#__PURE__*/__webpack_require__.n(_test__WEBPACK_IMPORTED_MODULE_0__);

_test__WEBPACK_IMPORTED_MODULE_0__.test();

/***/ }),

/***/ "./node_modules/ts-loader/index.js!./src/test.ts":
/*!*******************************************************!*\
  !*** ./node_modules/ts-loader/index.js!./src/test.ts ***!
  \*******************************************************/
/***/ ((__unused_webpack_module, __webpack_exports__, __webpack_require__) => {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony export */ __webpack_require__.d(__webpack_exports__, {
/* harmony export */   "test": () => (/* binding */ test)
/* harmony export */ });
function test() {
}

/***/ })

/******/    });
/************************************************************************/
/******/    // The module cache
/******/    var __webpack_module_cache__ = {};
/******/    
/******/    // The require function
/******/    function __webpack_require__(moduleId) {
/******/        // Check if module is in cache
/******/        var cachedModule = __webpack_module_cache__[moduleId];
/******/        if (cachedModule !== undefined) {
/******/            return cachedModule.exports;
/******/        }
/******/        // Create a new module (and put it into the cache)
/******/        var module = __webpack_module_cache__[moduleId] = {
/******/            // no module.id needed
/******/            // no module.loaded needed
/******/            exports: {}
/******/        };
/******/    
/******/        // Execute the module function
/******/        __webpack_modules__[moduleId](module, module.exports, __webpack_require__);
/******/    
/******/        // Return the exports of the module
/******/        return module.exports;
/******/    }
/******/    
/************************************************************************/
/******/    /* webpack/runtime/compat get default export */
/******/    (() => {
/******/        // getDefaultExport function for compatibility with non-harmony modules
/******/        __webpack_require__.n = (module) => {
/******/            var getter = module && module.__esModule ?
/******/                () => (module['default']) :
/******/                () => (module);
/******/            __webpack_require__.d(getter, { a: getter });
/******/            return getter;
/******/        };
/******/    })();
/******/    
/******/    /* webpack/runtime/define property getters */
/******/    (() => {
/******/        // define getter functions for harmony exports
/******/        __webpack_require__.d = (exports, definition) => {
/******/            for(var key in definition) {
/******/                if(__webpack_require__.o(definition, key) && !__webpack_require__.o(exports, key)) {
/******/                    Object.defineProperty(exports, key, { enumerable: true, get: definition[key] });
/******/                }
/******/            }
/******/        };
/******/    })();
/******/    
/******/    /* webpack/runtime/global */
/******/    (() => {
/******/        __webpack_require__.g = (function() {
/******/            if (typeof globalThis === 'object') return globalThis;
/******/            try {
/******/                return this || new Function('return this')();
/******/            } catch (e) {
/******/                if (typeof window === 'object') return window;
/******/            }
/******/        })();
/******/    })();
/******/    
/******/    /* webpack/runtime/hasOwnProperty shorthand */
/******/    (() => {
/******/        __webpack_require__.o = (obj, prop) => (Object.prototype.hasOwnProperty.call(obj, prop))
/******/    })();
/******/    
/******/    /* webpack/runtime/make namespace object */
/******/    (() => {
/******/        // define __esModule on exports
/******/        __webpack_require__.r = (exports) => {
/******/            if(typeof Symbol !== 'undefined' && Symbol.toStringTag) {
/******/                Object.defineProperty(exports, Symbol.toStringTag, { value: 'Module' });
/******/            }
/******/            Object.defineProperty(exports, '__esModule', { value: true });
/******/        };
/******/    })();
/******/    
/************************************************************************/
/******/    
/******/    // startup
/******/    // Load entry module and return exports
/******/    __webpack_require__("./src/main.ts");
/******/    // This entry module is referenced by other modules so it can't be inlined
/******/    var __webpack_exports__ = __webpack_require__("./src/test-exposed.ts");
/******/    
/******/ })()
;
//# sourceMappingURL=main.js.map

and another is

/******/ (() => { // webpackBootstrap
/******/    var __webpack_modules__ = ({

/***/ "./src/test.ts":
/*!*****************************!*\
  !*** ./src/test-exposed.ts ***!
  \*****************************/
/***/ ((module, __unused_webpack_exports, __webpack_require__) => {

var ___EXPOSE_LOADER_IMPORT___ = __webpack_require__(/*! -!../node_modules/ts-loader/index.js!./test.ts */ "./node_modules/ts-loader/index.js!./src/test.ts");
var ___EXPOSE_LOADER_GET_GLOBAL_THIS___ = __webpack_require__(/*! ../node_modules/expose-loader/dist/runtime/getGlobalThis.js */ "./node_modules/expose-loader/dist/runtime/getGlobalThis.js");
var ___EXPOSE_LOADER_GLOBAL_THIS___ = ___EXPOSE_LOADER_GET_GLOBAL_THIS___;
___EXPOSE_LOADER_GLOBAL_THIS___["test"] = ___EXPOSE_LOADER_IMPORT___;
module.exports = ___EXPOSE_LOADER_IMPORT___;

/***/ }),

/***/ "./node_modules/expose-loader/dist/runtime/getGlobalThis.js":
/*!******************************************************************!*\
  !*** ./node_modules/expose-loader/dist/runtime/getGlobalThis.js ***!
  \******************************************************************/
/***/ ((module, __unused_webpack_exports, __webpack_require__) => {

"use strict";

// eslint-disable-next-line func-names
module.exports = function () {
  if (typeof globalThis === "object") {
    return globalThis;
  }

  var g;

  try {
    // This works if eval is allowed (see CSP)
    // eslint-disable-next-line no-new-func
    g = this || new Function("return this")();
  } catch (e) {
    // This works if the window reference is available
    if (typeof window === "object") {
      return window;
    } // This works if the self reference is available

    if (typeof self === "object") {
      return self;
    } // This works if the global reference is available

    if (typeof __webpack_require__.g !== "undefined") {
      return __webpack_require__.g;
    }
  }

  return g;
}();

/***/ }),

/***/ "./src/main.ts":
/*!*********************!*\
  !*** ./src/main.ts ***!
  \*********************/
/***/ ((__unused_webpack_module, __webpack_exports__, __webpack_require__) => {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony import */ var _test__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(/*! ./test */ "./src/test.ts");
/* harmony import */ var _test__WEBPACK_IMPORTED_MODULE_0___default = /*#__PURE__*/__webpack_require__.n(_test__WEBPACK_IMPORTED_MODULE_0__);

_test__WEBPACK_IMPORTED_MODULE_0__.test();

/***/ }),

/***/ "./node_modules/ts-loader/index.js!./src/test.ts":
/*!*******************************************************!*\
  !*** ./node_modules/ts-loader/index.js!./src/test.ts ***!
  \*******************************************************/
/***/ ((__unused_webpack_module, __webpack_exports__, __webpack_require__) => {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony export */ __webpack_require__.d(__webpack_exports__, {
/* harmony export */   "test": () => (/* binding */ test)
/* harmony export */ });
function test() {
}

/***/ })

/******/    });
/************************************************************************/
/******/    // The module cache
/******/    var __webpack_module_cache__ = {};
/******/    
/******/    // The require function
/******/    function __webpack_require__(moduleId) {
/******/        // Check if module is in cache
/******/        var cachedModule = __webpack_module_cache__[moduleId];
/******/        if (cachedModule !== undefined) {
/******/            return cachedModule.exports;
/******/        }
/******/        // Create a new module (and put it into the cache)
/******/        var module = __webpack_module_cache__[moduleId] = {
/******/            // no module.id needed
/******/            // no module.loaded needed
/******/            exports: {}
/******/        };
/******/    
/******/        // Execute the module function
/******/        __webpack_modules__[moduleId](module, module.exports, __webpack_require__);
/******/    
/******/        // Return the exports of the module
/******/        return module.exports;
/******/    }
/******/    
/************************************************************************/
/******/    /* webpack/runtime/compat get default export */
/******/    (() => {
/******/        // getDefaultExport function for compatibility with non-harmony modules
/******/        __webpack_require__.n = (module) => {
/******/            var getter = module && module.__esModule ?
/******/                () => (module['default']) :
/******/                () => (module);
/******/            __webpack_require__.d(getter, { a: getter });
/******/            return getter;
/******/        };
/******/    })();
/******/    
/******/    /* webpack/runtime/define property getters */
/******/    (() => {
/******/        // define getter functions for harmony exports
/******/        __webpack_require__.d = (exports, definition) => {
/******/            for(var key in definition) {
/******/                if(__webpack_require__.o(definition, key) && !__webpack_require__.o(exports, key)) {
/******/                    Object.defineProperty(exports, key, { enumerable: true, get: definition[key] });
/******/                }
/******/            }
/******/        };
/******/    })();
/******/    
/******/    /* webpack/runtime/global */
/******/    (() => {
/******/        __webpack_require__.g = (function() {
/******/            if (typeof globalThis === 'object') return globalThis;
/******/            try {
/******/                return this || new Function('return this')();
/******/            } catch (e) {
/******/                if (typeof window === 'object') return window;
/******/            }
/******/        })();
/******/    })();
/******/    
/******/    /* webpack/runtime/hasOwnProperty shorthand */
/******/    (() => {
/******/        __webpack_require__.o = (obj, prop) => (Object.prototype.hasOwnProperty.call(obj, prop))
/******/    })();
/******/    
/******/    /* webpack/runtime/make namespace object */
/******/    (() => {
/******/        // define __esModule on exports
/******/        __webpack_require__.r = (exports) => {
/******/            if(typeof Symbol !== 'undefined' && Symbol.toStringTag) {
/******/                Object.defineProperty(exports, Symbol.toStringTag, { value: 'Module' });
/******/            }
/******/            Object.defineProperty(exports, '__esModule', { value: true });
/******/        };
/******/    })();
/******/    
/************************************************************************/
/******/    
/******/    // startup
/******/    // Load entry module and return exports
/******/    __webpack_require__("./src/main.ts");
/******/    // This entry module is referenced by other modules so it can't be inlined
/******/    var __webpack_exports__ = __webpack_require__("./src/test.ts");
/******/    
/******/ })()
;
//# sourceMappingURL=main.js.map

Expected Behavior

webpack and webpack --watch will get same output

How Do We Reproduce?

I create a demo for this: https://github.com/libla/expose-loader-demo.git checkout this repository, run command npm run build get the first output. Next, run command npm run watch, then modify a file (such as adding an empty line), wait watch poll, get the other output.

Please paste the results of npx webpack-cli info here, and mention other relevant information

System:
    OS: Windows 7 6.1.7601
    CPU: (4) x64 Intel(R) Core(TM) i7-4600U CPU @ 2.10GHz
    Memory: 5.22 GB / 11.88 GB
  Binaries:
    Node: 12.22.5 - D:\SDK\node.js\node.EXE
    npm: 6.14.14 - D:\SDK\node.js\npm.CMD
  Browsers:
    Internet Explorer: 11.0.9600.19081
  Packages:
    expose-loader: ^3.1.0 => 3.1.0
    ts-loader: ^9.2.6 => 9.2.6
    webpack: ^5.69.1 => 5.69.1
    webpack-cli: ^4.9.2 => 4.9.2

[alexander-akait]

Sorry for delay, yep, it is wrong setup, don't use:

rules: [{
            test: require.resolve('./src/test.ts'),
            loader: 'expose-loader',
            options: {
                exposes: {
                    globalName: "test",
                    override: true,
                }
            }
        }, {
            test: /\.ts$/,
            loader: 'ts-loader'
        }]

Because you apply two loader for the same file at the same time, so webpack tried to appy both, so you have different output, set exclude with ./src/test.ts for ts-loader and setup two loader for test.ts - expose-loader and ts-loader.

Feel free to feedback