webpack/examples/require.context

example.js

function getTemplate(templateName) {
	return require("./templates/"+templateName);
}
console.log(getTemplate("a"));
console.log(getTemplate("b"));

templates/

• a.js
• b.js
• c.js

All templates are of this pattern:

module.exports = function() {
	return "This text was generated by template X";
}

dist/output.js

/******/ (function(modules) { /* webpackBootstrap */ })

/******/ (function(modules, runtime) { // webpackBootstrap
/******/ 	"use strict";
/******/ 	// 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;
/******/ 	}
/******/
/******/
/******/
/******/
/******/ 	// Load entry module and return exports
/******/ 	return __webpack_require__(0);
/******/ })
/************************************************************************/

/******/ ([
/* 0 */
/*!********************!*\
  !*** ./example.js ***!
  \********************/
/*! no static exports found */
/*! runtime requirements: __webpack_require__ */
/***/ (function(__unusedmodule, __unusedexports, __webpack_require__) {

function getTemplate(templateName) {
	return __webpack_require__(1)("./"+templateName);
}
console.log(getTemplate("a"));
console.log(getTemplate("b"));

/***/ }),
/* 1 */
/*!*********************************!*\
  !*** ./templates sync ^\.\/.*$ ***!
  \*********************************/
/*! no static exports found */
/*! runtime requirements: module, __webpack_require__ */
/***/ (function(module, __unusedexports, __webpack_require__) {

var map = {
	"./a": 2,
	"./a.js": 2,
	"./b": 3,
	"./b.js": 3,
	"./c": 4,
	"./c.js": 4
};


function webpackContext(req) {
	var id = webpackContextResolve(req);
	return __webpack_require__(id);
}
function webpackContextResolve(req) {
	var id = map[req];
	if(!(id + 1)) { // check for number or string
		var e = new Error("Cannot find module '" + req + "'");
		e.code = 'MODULE_NOT_FOUND';
		throw e;
	}
	return id;
}
webpackContext.keys = function webpackContextKeys() {
	return Object.keys(map);
};
webpackContext.resolve = webpackContextResolve;
module.exports = webpackContext;
webpackContext.id = 1;

/***/ }),
/* 2 */
/*!************************!*\
  !*** ./templates/a.js ***!
  \************************/
/*! no static exports found */
/*! runtime requirements: module */
/***/ (function(module) {

module.exports = function() {
	return "This text was generated by template A";
}

/***/ }),
/* 3 */
/*!************************!*\
  !*** ./templates/b.js ***!
  \************************/
/*! no static exports found */
/*! runtime requirements: module */
/***/ (function(module) {

module.exports = function() {
	return "This text was generated by template B";
}

/***/ }),
/* 4 */
/*!************************!*\
  !*** ./templates/c.js ***!
  \************************/
/*! no static exports found */
/*! runtime requirements: module */
/***/ (function(module) {

module.exports = function() {
	return "This text was generated by template C";
}

/***/ })
/******/ ]);

Info

Unoptimized

Hash: 0a1b2c3d4e5f6a7b8c9d
Version: webpack 5.0.0-next
    Asset      Size  Chunks             Chunk Names
output.js  3.24 KiB     {0}  [emitted]  main
Entrypoint main = output.js
chunk {0} output.js (main) 603 bytes [entry] [rendered]
    > .\example.js main
 [0] ./example.js 146 bytes {0} [built]
     [used exports unknown]
     entry .\example.js main
 [1] ./templates sync ^\.\/.*$ 217 bytes {0} [built]
     [used exports unknown]
     cjs require context ./templates [0] ./example.js 2:8-44
 [2] ./templates/a.js 80 bytes {0} [optional] [built]
     [used exports unknown]
     context element ./a [1] ./templates sync ^\.\/.*$ ./a
     context element ./a.js [1] ./templates sync ^\.\/.*$ ./a.js
 [3] ./templates/b.js 80 bytes {0} [optional] [built]
     [used exports unknown]
     context element ./b [1] ./templates sync ^\.\/.*$ ./b
     context element ./b.js [1] ./templates sync ^\.\/.*$ ./b.js
 [4] ./templates/c.js 80 bytes {0} [optional] [built]
     [used exports unknown]
     context element ./c [1] ./templates sync ^\.\/.*$ ./c
     context element ./c.js [1] ./templates sync ^\.\/.*$ ./c.js

Production mode

Hash: 0a1b2c3d4e5f6a7b8c9d
Version: webpack 5.0.0-next
    Asset       Size  Chunks             Chunk Names
output.js  869 bytes   {404}  [emitted]  main
Entrypoint main = output.js
chunk {404} output.js (main) 603 bytes [entry] [rendered]
    > .\example.js main
 [117] ./templates/a.js 80 bytes {404} [optional] [built]
       context element ./a [545] ./templates sync ^\.\/.*$ ./a
       context element ./a.js [545] ./templates sync ^\.\/.*$ ./a.js
 [132] ./templates/c.js 80 bytes {404} [optional] [built]
       context element ./c [545] ./templates sync ^\.\/.*$ ./c
       context element ./c.js [545] ./templates sync ^\.\/.*$ ./c.js
 [139] ./templates/b.js 80 bytes {404} [optional] [built]
       context element ./b [545] ./templates sync ^\.\/.*$ ./b
       context element ./b.js [545] ./templates sync ^\.\/.*$ ./b.js
 [275] ./example.js 146 bytes {404} [built]
       entry .\example.js main
 [545] ./templates sync ^\.\/.*$ 217 bytes {404} [built]
       cjs require context ./templates [275] ./example.js 2:8-44

Code Splitting

See this example combined with code splitting