Add eslint-import-plugin to node_modules

Will be used to make sure no default exports are in DevTools.

The PRESUBMIT.py has been updated to skip running the formatting check
if node_modules files are affected, to workaround crbug.com/1068198.

DISABLE_THIRD_PARTY_CHECK=Add plugin to node_modules

Bug: 1068198
Change-Id: I04d4dc813daa01099f21d40edf47aaefcc0b045f
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2135610
Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org>
Auto-Submit: Tim van der Lippe <tvanderlippe@chromium.org>
Reviewed-by: Jack Franklin <jacktfranklin@chromium.org>
diff --git a/node_modules/eslint-module-utils/ignore.js b/node_modules/eslint-module-utils/ignore.js
new file mode 100644
index 0000000..47af812
--- /dev/null
+++ b/node_modules/eslint-module-utils/ignore.js
@@ -0,0 +1,60 @@
+'use strict'
+exports.__esModule = true
+
+const extname = require('path').extname
+
+const log = require('debug')('eslint-plugin-import:utils:ignore')
+
+// one-shot memoized
+let cachedSet, lastSettings
+function validExtensions(context) {
+  if (cachedSet && context.settings === lastSettings) {
+    return cachedSet
+  }
+
+  lastSettings = context.settings
+  cachedSet = makeValidExtensionSet(context.settings)
+  return cachedSet
+}
+
+function makeValidExtensionSet(settings) {
+  // start with explicit JS-parsed extensions
+  const exts = new Set(settings['import/extensions'] || [ '.js' ])
+
+  // all alternate parser extensions are also valid
+  if ('import/parsers' in settings) {
+    for (let parser in settings['import/parsers']) {
+      const parserSettings = settings['import/parsers'][parser]
+      if (!Array.isArray(parserSettings)) {
+        throw new TypeError('"settings" for ' + parser + ' must be an array')
+      }
+      parserSettings.forEach(ext => exts.add(ext))
+    }
+  }
+
+  return exts
+}
+exports.getFileExtensions = makeValidExtensionSet
+
+exports.default = function ignore(path, context) {
+  // check extension whitelist first (cheap)
+  if (!hasValidExtension(path, context)) return true
+
+  if (!('import/ignore' in context.settings)) return false
+  const ignoreStrings = context.settings['import/ignore']
+
+  for (let i = 0; i < ignoreStrings.length; i++) {
+    const regex = new RegExp(ignoreStrings[i])
+    if (regex.test(path)) {
+      log(`ignoring ${path}, matched pattern /${ignoreStrings[i]}/`)
+      return true
+    }
+  }
+
+  return false
+}
+
+function hasValidExtension(path, context) {
+  return validExtensions(context).has(extname(path))
+}
+exports.hasValidExtension = hasValidExtension