Reproduction of webpack issue:
- Import something invalid from an existing file
- webpack compiles successfully
- There's a runtime error
webpack.config.js:
const path = require('path');
module.exports = {
mode: 'development',
entry: {
foo: './src/foo.js',
},
output: {
path: path.resolve(__dirname, 'dist'),
},
module: {
strictExportPresence: true,
}
}
src/foo.js:
// doesn't compile:
// import {dsfksdfksdjfkj} from './dsfksdjfkdsj';
// compiles:
import { doesntExist } from './bar';
// fails, but only at runtime
doesntExist();
src/bar.js:
module.exports = {
bar: true,
}
dist/foo.js:
/******/ (function(modules) { // webpackBootstrap
/******/ // The module cache
/******/ var installedModules = {};
/******/
/******/ // The require function
/******/ function __webpack_require__(moduleId) {
/******/
/******/ // Check if module is in cache
/******/ if(installedModules[moduleId]) {
/******/ return installedModules[moduleId].exports;
/******/ }
/******/ // Create a new module (and put it into the cache)
/******/ var module = installedModules[moduleId] = {
/******/ i: moduleId,
/******/ l: false,
/******/ exports: {}
/******/ };
/******/
/******/ // Execute the module function
/******/ modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
/******/
/******/ // Flag the module as loaded
/******/ module.l = true;
/******/
/******/ // Return the exports of the module
/******/ return module.exports;
/******/ }
/******/
/******/
/******/ // expose the modules object (__webpack_modules__)
/******/ __webpack_require__.m = modules;
/******/
/******/ // expose the module cache
/******/ __webpack_require__.c = installedModules;
/******/
/******/ // define getter function for harmony exports
/******/ __webpack_require__.d = function(exports, name, getter) {
/******/ if(!__webpack_require__.o(exports, name)) {
/******/ Object.defineProperty(exports, name, { enumerable: true, get: getter });
/******/ }
/******/ };
/******/
/******/ // define __esModule on exports
/******/ __webpack_require__.r = function(exports) {
/******/ if(typeof Symbol !== 'undefined' && Symbol.toStringTag) {
/******/ Object.defineProperty(exports, Symbol.toStringTag, { value: 'Module' });
/******/ }
/******/ Object.defineProperty(exports, '__esModule', { value: true });
/******/ };
/******/
/******/ // create a fake namespace object
/******/ // mode & 1: value is a module id, require it
/******/ // mode & 2: merge all properties of value into the ns
/******/ // mode & 4: return value when already ns object
/******/ // mode & 8|1: behave like require
/******/ __webpack_require__.t = function(value, mode) {
/******/ if(mode & 1) value = __webpack_require__(value);
/******/ if(mode & 8) return value;
/******/ if((mode & 4) && typeof value === 'object' && value && value.__esModule) return value;
/******/ var ns = Object.create(null);
/******/ __webpack_require__.r(ns);
/******/ Object.defineProperty(ns, 'default', { enumerable: true, value: value });
/******/ if(mode & 2 && typeof value != 'string') for(var key in value) __webpack_require__.d(ns, key, function(key) { return value[key]; }.bind(null, key));
/******/ return ns;
/******/ };
/******/
/******/ // getDefaultExport function for compatibility with non-harmony modules
/******/ __webpack_require__.n = function(module) {
/******/ var getter = module && module.__esModule ?
/******/ function getDefault() { return module['default']; } :
/******/ function getModuleExports() { return module; };
/******/ __webpack_require__.d(getter, 'a', getter);
/******/ return getter;
/******/ };
/******/
/******/ // Object.prototype.hasOwnProperty.call
/******/ __webpack_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); };
/******/
/******/ // __webpack_public_path__
/******/ __webpack_require__.p = "";
/******/
/******/
/******/ // Load entry module and return exports
/******/ return __webpack_require__(__webpack_require__.s = "./src/foo.js");
/******/ })
/************************************************************************/
/******/ ({
/***/ "./src/bar.js":
/*!********************!*\
!*** ./src/bar.js ***!
\********************/
/*! no static exports found */
/***/ (function(module, exports) {
eval("module.exports = {\n bar: true,\n}\n\n\n//# sourceURL=webpack:///./src/bar.js?");
/***/ }),
/***/ "./src/foo.js":
/*!********************!*\
!*** ./src/foo.js ***!
\********************/
/*! no exports provided */
/***/ (function(module, __webpack_exports__, __webpack_require__) {
"use strict";
eval("__webpack_require__.r(__webpack_exports__);\n/* harmony import */ var _bar__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(/*! ./bar */ \"./src/bar.js\");\n/* harmony import */ var _bar__WEBPACK_IMPORTED_MODULE_0___default = /*#__PURE__*/__webpack_require__.n(_bar__WEBPACK_IMPORTED_MODULE_0__);\n// doesn't compile:\n// import {dsfksdfksdjfkj} from './dsfksdjfkdsj';\n\n// compiles:\n\n\n// fails, but only at runtime\nObject(_bar__WEBPACK_IMPORTED_MODULE_0__[\"doesntExist\"])();\n\n\n//# sourceURL=webpack:///./src/foo.js?");
/***/ })
/******/ });
webpack output:
Hash: fb894f8fb433e239906b
Version: webpack 4.39.2
Time: 67ms
Built at: 2019-08-26 11:18:32
Asset Size Chunks Chunk Names
foo.js 4.54 KiB foo [emitted] foo
Entrypoint foo = foo.js
[./src/bar.js] 34 bytes {foo} [built]
[./src/foo.js] 169 bytes {foo} [built]
Runtime error:
11:21:18.752 foo.js:11 Uncaught TypeError: Object(...) is not a function
at eval (foo.js:11)
at Module../src/foo.js (foo.js:108)
at __webpack_require__ (foo.js:20)
at foo.js:84
at foo.js:87