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example.js

import { get, set, getNumber } from "./magic.js";

// accessing memory
console.log(get());
set(42);
console.log(get());
set(123);
console.log(get());

// random numbers
console.log(getNumber());
console.log(getNumber());
console.log(getNumber());

magic.js

// reexporting
export * from "./magic.wat";

magic.wat

(module
  (type $t0 (func (result i32)))
  (type $t1 (func (param i32)))
  (import "./memory.js" "memory" (memory 1))
  (import "./magic-number.js" "getRandomNumber" (func $getRandomNumber (type $t0)))
  (func $get (export "get") (type $t0) (result i32)
    (i32.load
      (i32.const 0)))
  (func $set (export "set") (type $t1) (param $p i32)
    (i32.store
      (i32.const 0)
      (get_local $p)))
  (func $get (export "getNumber") (type $t0) (result i32)
    (call $getRandomNumber))
)

magic-number.js

export function getNumber() {
	return 42;
}

export function getRandomNumber() {
	return Math.floor(Math.random() * 256);
}

memory.js

async function getMemoryFromParentInWorker() {
	await new Promise(r => setTimeout(r, 200));
	// fake
	return new WebAssembly.Memory({ initial: 1 });
}

export const memory = await getMemoryFromParentInWorker();

dist/output.js

/******/ (() => { // webpackBootstrap
/******/ 	"use strict";
/******/ 	var __webpack_modules__ = ([
/* 0 */
/*!********************!*\
  !*** ./example.js ***!
  \********************/
/*! namespace exports */
/*! exports [not provided] [no usage info] */
/*! runtime requirements: __webpack_require__, __webpack_require__.r, __webpack_exports__, module, __webpack_require__.* */
/***/ ((module, __webpack_exports__, __webpack_require__) => {

module.exports = (async () => {
__webpack_require__.r(__webpack_exports__);
/* harmony import */ var _magic_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(/*! ./magic.js */ 1);
_magic_js__WEBPACK_IMPORTED_MODULE_0__ = await Promise.resolve(_magic_js__WEBPACK_IMPORTED_MODULE_0__);


// accessing memory
console.log((0,_magic_js__WEBPACK_IMPORTED_MODULE_0__.get)());
(0,_magic_js__WEBPACK_IMPORTED_MODULE_0__.set)(42);
console.log((0,_magic_js__WEBPACK_IMPORTED_MODULE_0__.get)());
(0,_magic_js__WEBPACK_IMPORTED_MODULE_0__.set)(123);
console.log((0,_magic_js__WEBPACK_IMPORTED_MODULE_0__.get)());

// random numbers
console.log((0,_magic_js__WEBPACK_IMPORTED_MODULE_0__.getNumber)());
console.log((0,_magic_js__WEBPACK_IMPORTED_MODULE_0__.getNumber)());
console.log((0,_magic_js__WEBPACK_IMPORTED_MODULE_0__.getNumber)());

return __webpack_exports__;
})();

/***/ }),
/* 1 */
/*!******************!*\
  !*** ./magic.js ***!
  \******************/
/*! namespace exports */
/*! export get [provided] [no usage info] [missing usage info prevents renaming] -> ./magic.wat .get */
/*! export getNumber [provided] [no usage info] [missing usage info prevents renaming] -> ./magic.wat .getNumber */
/*! export set [provided] [no usage info] [missing usage info prevents renaming] -> ./magic.wat .set */
/*! other exports [not provided] [no usage info] */
/*! runtime requirements: __webpack_require__, __webpack_exports__, __webpack_require__.d, __webpack_require__.r, module, __webpack_require__.* */
/***/ ((module, __webpack_exports__, __webpack_require__) => {

module.exports = (async () => {
__webpack_require__.r(__webpack_exports__);
/* harmony export */ __webpack_require__.d(__webpack_exports__, {
/* harmony export */   "get": () => /* reexport safe */ _magic_wat__WEBPACK_IMPORTED_MODULE_0__.get,
/* harmony export */   "getNumber": () => /* reexport safe */ _magic_wat__WEBPACK_IMPORTED_MODULE_0__.getNumber,
/* harmony export */   "set": () => /* reexport safe */ _magic_wat__WEBPACK_IMPORTED_MODULE_0__.set
/* harmony export */ });
/* harmony import */ var _magic_wat__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(/*! ./magic.wat */ 2);
_magic_wat__WEBPACK_IMPORTED_MODULE_0__ = await Promise.resolve(_magic_wat__WEBPACK_IMPORTED_MODULE_0__);
// reexporting


return __webpack_exports__;
})();

/***/ }),
/* 2 */
/*!*******************!*\
  !*** ./magic.wat ***!
  \*******************/
/*! namespace exports */
/*! export get [provided] [no usage info] [provision prevents renaming (no use info)] */
/*! export getNumber [provided] [no usage info] [provision prevents renaming (no use info)] */
/*! export set [provided] [no usage info] [provision prevents renaming (no use info)] */
/*! other exports [not provided] [no usage info] */
/*! runtime requirements: module, module.id, __webpack_exports__, __webpack_require__.v, __webpack_require__, __webpack_require__.* */
/***/ ((module, exports, __webpack_require__) => {

/* harmony import */ var WEBPACK_IMPORTED_MODULE_0 = __webpack_require__(/*! ./memory.js */ 3);
/* harmony import */ var WEBPACK_IMPORTED_MODULE_1 = __webpack_require__(/*! ./magic-number.js */ 4);
module.exports = Promise.resolve(WEBPACK_IMPORTED_MODULE_0).then((WEBPACK_IMPORTED_MODULE_0) => {
	return __webpack_require__.v(exports, module.id, "b7db4b0f3af7dad67222", {
		"./memory.js": {
			"memory": WEBPACK_IMPORTED_MODULE_0.memory
		},
		"./magic-number.js": {
			"getRandomNumber": WEBPACK_IMPORTED_MODULE_1.getRandomNumber
		}
	});
})

/***/ }),
/* 3 */
/*!*******************!*\
  !*** ./memory.js ***!
  \*******************/
/*! namespace exports */
/*! export memory [provided] [no usage info] [missing usage info prevents renaming] */
/*! other exports [not provided] [no usage info] */
/*! runtime requirements: __webpack_require__.r, __webpack_exports__, module, __webpack_require__.d, __webpack_require__.* */
/***/ ((module, __webpack_exports__, __webpack_require__) => {

module.exports = (async () => {
__webpack_require__.r(__webpack_exports__);
/* harmony export */ __webpack_require__.d(__webpack_exports__, {
/* harmony export */   "memory": () => /* binding */ memory
/* harmony export */ });
async function getMemoryFromParentInWorker() {
	await new Promise(r => setTimeout(r, 200));
	// fake
	return new WebAssembly.Memory({ initial: 1 });
}

const memory = await getMemoryFromParentInWorker();

return __webpack_exports__;
})();

/***/ }),
/* 4 */
/*!*************************!*\
  !*** ./magic-number.js ***!
  \*************************/
/*! namespace exports */
/*! export getNumber [provided] [no usage info] [missing usage info prevents renaming] */
/*! export getRandomNumber [provided] [no usage info] [missing usage info prevents renaming] */
/*! other exports [not provided] [no usage info] */
/*! runtime requirements: __webpack_require__.r, __webpack_exports__, __webpack_require__.d, __webpack_require__.* */
/***/ ((__unused_webpack_module, __webpack_exports__, __webpack_require__) => {

__webpack_require__.r(__webpack_exports__);
/* harmony export */ __webpack_require__.d(__webpack_exports__, {
/* harmony export */   "getNumber": () => /* binding */ getNumber,
/* harmony export */   "getRandomNumber": () => /* binding */ getRandomNumber
/* harmony export */ });
function getNumber() {
	return 42;
}

function getRandomNumber() {
	return Math.floor(Math.random() * 256);
}


/***/ })
/******/ 	]);
/* webpack runtime code */ 
/************************************************************************/
/******/ 	// The module cache
/******/ 	var __webpack_module_cache__ = {};
/******/ 	
/******/ 	// The require function
/******/ 	function __webpack_require__(moduleId) {
/******/ 		// Check if module is in cache
/******/ 		if(__webpack_module_cache__[moduleId]) {
/******/ 			return __webpack_module_cache__[moduleId].exports;
/******/ 		}
/******/ 		// Create a new module (and put it into the cache)
/******/ 		var module = __webpack_module_cache__[moduleId] = {
/******/ 			id: moduleId,
/******/ 			// 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/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/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 });
/******/ 		};
/******/ 	})();
/******/ 	
/******/ 	/* webpack/runtime/publicPath */
/******/ 	(() => {
/******/ 		__webpack_require__.p = "dist/";
/******/ 	})();
/******/ 	
/******/ 	/* webpack/runtime/wasm chunk loading */
/******/ 	(() => {
/******/ 		__webpack_require__.v = (exports, wasmModuleId, wasmModuleHash, importsObj) => {
/******/ 			var req = fetch(__webpack_require__.p + "" + wasmModuleHash + ".module.wasm");
/******/ 			if (typeof WebAssembly.instantiateStreaming === 'function') {
/******/ 				return WebAssembly.instantiateStreaming(req, importsObj)
/******/ 					.then((res) => Object.assign(exports, res.instance.exports));
/******/ 			}
/******/ 			return req
/******/ 				.then((x) => x.arrayBuffer())
/******/ 				.then((bytes) => WebAssembly.instantiate(bytes, importsObj))
/******/ 				.then((res) => Object.assign(exports, res.instance.exports));
/******/ 		};
/******/ 	})();
/******/ 	
/************************************************************************/

/******/ 	// startup
/******/ 	// Load entry module
/******/ 	__webpack_require__(0);
/******/ 	// This entry module used 'module' so it can't be inlined
/******/ })()
;

Info

Unoptimized

asset output.js 8.87 KiB [emitted] (name: main)
asset b7db4b0f3af7dad67222.module.wasm 139 bytes [emitted] [immutable] (auxiliary name: main)
chunk output.js (main) 696 bytes (javascript) 139 bytes (webassembly) 1.2 KiB (runtime) [entry] [rendered]
  > ./example.js main
  runtime modules 1.2 KiB 5 modules
  dependent modules 449 bytes (javascript) 139 bytes (webassembly) [dependent] 4 modules
  ./example.js 247 bytes [built] [code generated]
    [no exports]
    [used exports unknown]
    entry ./example.js main
webpack 5.0.0-beta.32 compiled successfully

Production mode

asset output.js 1.43 KiB [emitted] [minimized] (name: main)
asset 3b415f18e7be9a707201.module.wasm 139 bytes [emitted] [immutable] (auxiliary name: main)
chunk (runtime: main) output.js (main) 696 bytes (javascript) 139 bytes (webassembly) 950 bytes (runtime) [entry] [rendered]
  > ./example.js main
  dependent modules 449 bytes (javascript) 139 bytes (webassembly) [dependent] 4 modules
  runtime modules 950 bytes 4 modules
  ./example.js 247 bytes [built] [code generated]
    [no exports]
    [no exports used]
    entry ./example.js main
webpack 5.0.0-beta.32 compiled successfully