utils: Uses createRequireFromPath to resolve loaders

Author: arcanis

tests/files/node_modules/eslint-import-resolver-foo/index.js

@@ -94,6 +94,14 @@ describe('resolve', function () {
                       )).to.equal(utils.testFilePath('./bar.jsx'))
   })
 
+  it('finds resolvers from the source files rather than eslint-module-utils', function () {
+    const testContext = utils.testContext({ 'import/resolver': { 'foo': {} } })
+
+    expect(resolve( '../files/foo'
+                      , Object.assign({}, testContext, { getFilename: function () { return utils.getFilename('foo.js') } }),
+                      )).to.equal(utils.testFilePath('./bar.jsx'))
+  })
+
   it('reports invalid import/resolver config', function () {
     const testContext = utils.testContext({ 'import/resolver': 123.456 })
     const testContextReports = []

tests/src/core/resolve.js

@@ -343,19 +343,19 @@ ruleTester.run('no-unresolved unknown resolver', rule, {
     // logs resolver load error
     test({
       code: 'import "./malformed.js"',
-      settings: { 'import/resolver': 'foo' },
+      settings: { 'import/resolver': 'doesnt-exist' },
       errors: [
-        `Resolve error: unable to load resolver "foo".`,
+        `Resolve error: unable to load resolver "doesnt-exist".`,
         `Unable to resolve path to module './malformed.js'.`,
       ],
     }),
 
     // only logs resolver message once
     test({
       code: 'import "./malformed.js"; import "./fake.js"',
-      settings: { 'import/resolver': 'foo' },
+      settings: { 'import/resolver': 'doesnt-exist' },
       errors: [
-        `Resolve error: unable to load resolver "foo".`,
+        `Resolve error: unable to load resolver "doesnt-exist".`,
         `Unable to resolve path to module './malformed.js'.`,
         `Unable to resolve path to module './fake.js'.`,
       ],

tests/src/rules/no-unresolved.js

@@ -5,6 +5,9 @@ This change log adheres to standards from [Keep a CHANGELOG](http://keepachangel
 
 ## Unreleased
 
+### Fixed
+- Uses createRequireFromPath to resolve loaders ([#1591], thanks [@arcanis])
+
 ## v2.5.0 - 2019-12-07
 
 ### Added
@@ -59,7 +62,7 @@ Yanked due to critical issue with cache key resulting from #839.
 - `unambiguous.test()` regex is now properly in multiline mode
 
 
-
+[#1591]: https://github.com/benmosher/eslint-plugin-import/pull/1591
 [#1551]: https://github.com/benmosher/eslint-plugin-import/pull/1551
 [#1435]: https://github.com/benmosher/eslint-plugin-import/pull/1435
 [#1409]: https://github.com/benmosher/eslint-plugin-import/pull/1409
@@ -77,3 +80,4 @@ Yanked due to critical issue with cache key resulting from #839.
 [@christophercurrie]: https://github.com/christophercurrie
 [@brettz9]: https://github.com/brettz9
 [@JounQin]: https://github.com/JounQin
+[@arcanis]: https://github.com/arcanis

utils/CHANGELOG.md

@@ -4,6 +4,7 @@ exports.__esModule = true
 const pkgDir = require('pkg-dir')
 
 const fs = require('fs')
+const Module = require('module')
 const path = require('path')
 
 const hashObject = require('./hash').hashObject
@@ -14,11 +15,26 @@ exports.CASE_SENSITIVE_FS = CASE_SENSITIVE_FS
 
 const fileExistsCache = new ModuleCache()
 
-function tryRequire(target) {
+// Polyfill Node's `Module.createRequireFromPath` if not present (added in Node v10.12.0)
+const createRequireFromPath = 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 tryRequire(target, sourceFile) {
   let resolved
   try {
     // Check if the target exists
-    resolved = require.resolve(target)
+    if (sourceFile != null) {
+      resolved = createRequireFromPath(sourceFile).resolve(target)
+    } else {
+      resolved = require.resolve(target)
+    }
   } catch(e) {
     // If the target does not exist then just return undefined
     return undefined
@@ -154,8 +170,8 @@ function getBaseDir(sourceFile) {
 }
 function requireResolver(name, sourceFile) {
   // Try to resolve package with conventional name
-  let resolver = tryRequire(`eslint-import-resolver-${name}`) ||
-    tryRequire(name) ||
+  let resolver = tryRequire(`eslint-import-resolver-${name}`, sourceFile) ||
+    tryRequire(name, sourceFile) ||
     tryRequire(path.resolve(getBaseDir(sourceFile), name))
 
   if (!resolver) {