2 const path = require('path');
3 const resolveFrom = require('resolve-from');
4 const parentModule = require('parent-module');
6 module.exports = moduleId => {
7 if (typeof moduleId !== 'string') {
8 throw new TypeError('Expected a string');
11 const parentPath = parentModule(__filename);
13 const cwd = parentPath ? path.dirname(parentPath) : __dirname;
14 const filePath = resolveFrom(cwd, moduleId);
16 const oldModule = require.cache[filePath];
17 // Delete itself from module parent
18 if (oldModule && oldModule.parent) {
19 let i = oldModule.parent.children.length;
22 if (oldModule.parent.children[i].id === filePath) {
23 oldModule.parent.children.splice(i, 1);
28 delete require.cache[filePath]; // Delete module from cache
30 const parent = require.cache[parentPath]; // If `filePath` and `parentPath` are the same, cache will already be deleted so we won't get a memory leak in next step
32 return parent === undefined ? require(filePath) : parent.require(filePath); // In case cache doesn't have parent, fall back to normal require