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refactor: use createRequire to load/resolve modules #5092

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merged 2 commits into from Jan 23, 2020
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46 changes: 34 additions & 12 deletions packages/@vue/cli-shared-utils/lib/module.js
@@ -1,18 +1,34 @@
const Module = require('module')
const path = require('path')

const semver = require('semver')

// https://github.com/benmosher/eslint-plugin-import/pull/1591
// https://github.com/benmosher/eslint-plugin-import/pull/1602
// Polyfill Node's `Module.createRequireFromPath` if not present (added in Node v10.12.0)
// Use `Module.createRequire` if available (added in Node v12.2.0)
const createRequire = Module.createRequire || Module.createRequireFromPath || function (filename) {
const mod = new Module(filename, null)
mod.filename = filename
mod.paths = Module._nodeModulePaths(path.dirname(filename))

mod._compile(`module.exports = require;`, filename)

return mod.exports
}

function resolveFallback (request, options) {
const Module = require('module')
const isMain = false
const fakeParent = new Module('', null)

const paths = []

for (let i = 0; i < options.paths.length; i++) {
const path = options.paths[i]
fakeParent.paths = Module._nodeModulePaths(path)
const p = options.paths[i]
fakeParent.paths = Module._nodeModulePaths(p)
const lookupPaths = Module._resolveLookupPaths(request, fakeParent, true)

if (!paths.includes(path)) paths.push(path)
if (!paths.includes(p)) paths.push(p)

for (let j = 0; j < lookupPaths.length; j++) {
if (!paths.includes(lookupPaths[j])) paths.push(lookupPaths[j])
Expand All @@ -35,20 +51,26 @@ const resolve = semver.satisfies(process.version, '>=10.0.0')
exports.resolveModule = function (request, context) {
let resolvedPath
try {
resolvedPath = resolve(request, {
paths: [context]
})
try {
resolvedPath = createRequire(path.resolve(context, 'package.json')).resolve(request)
} catch (e) {
resolvedPath = resolve(request, { paths: [context] })
}
} catch (e) {}
return resolvedPath
}

exports.loadModule = function (request, context, force = false) {
const resolvedPath = exports.resolveModule(request, context)
if (resolvedPath) {
if (force) {
clearRequireCache(resolvedPath)
try {
return createRequire(path.resolve(context, 'package.json'))(request)
} catch (e) {
const resolvedPath = exports.resolveModule(request, context)
if (resolvedPath) {
if (force) {
clearRequireCache(resolvedPath)
}
return require(resolvedPath)
}
return require(resolvedPath)
}
}

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