tools: update to ESLint 4.1.1

PR-URL: https://github.com/nodejs/node/pull/13946
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

6 files changed, 95 insertions, 40 deletions

diff --git a/tools/eslint/lib/config.js b/tools/eslint/lib/config.js
index c69d120ef7..2db87d9426 100644
--- a/tools/eslint/lib/config.js
+++ b/tools/eslint/lib/config.js
@@ -66,13 +66,14 @@ class Config {
         this.parser = options.parser;
         this.parserOptions = options.parserOptions || {};
 
+        this.configCache = new ConfigCache();
+
         this.baseConfig = options.baseConfig
             ? ConfigOps.merge({}, ConfigFile.loadObject(options.baseConfig, this))
             : { rules: {} };
         this.baseConfig.filePath = "";
         this.baseConfig.baseDirectory = this.options.cwd;
 
-        this.configCache = new ConfigCache();
         this.configCache.setConfig(this.baseConfig.filePath, this.baseConfig);
         this.configCache.setMergedVectorConfig(this.baseConfig.filePath, this.baseConfig);
 
diff --git a/tools/eslint/lib/config/config-cache.js b/tools/eslint/lib/config/config-cache.js
index 0ffcae9440..07436a87c8 100644
--- a/tools/eslint/lib/config/config-cache.js
+++ b/tools/eslint/lib/config/config-cache.js
@@ -24,12 +24,12 @@ function hash(vector) {
 //------------------------------------------------------------------------------
 
 /**
- * Configuration caching class (not exported)
+ * Configuration caching class
  */
-class ConfigCache {
+module.exports = class ConfigCache {
 
     constructor() {
-        this.filePathCache = new Map();
+        this.configFullNameCache = new Map();
         this.localHierarchyCache = new Map();
         this.mergedVectorCache = new Map();
         this.mergedCache = new Map();
@@ -37,23 +37,25 @@ class ConfigCache {
 
     /**
      * Gets a config object from the cache for the specified config file path.
-     * @param {string} configFilePath the absolute path to the config file
+     * @param {string} configFullName the name of the configuration as used in the eslint config(e.g. 'plugin:node/recommended'),
+     * or the absolute path to a config file. This should uniquely identify a config.
      * @returns {Object|null} config object, if found in the cache, otherwise null
      * @private
      */
-    getConfig(configFilePath) {
-        return this.filePathCache.get(configFilePath);
+    getConfig(configFullName) {
+        return this.configFullNameCache.get(configFullName);
     }
 
     /**
      * Sets a config object in the cache for the specified config file path.
-     * @param {string} configFilePath the absolute path to the config file
+     * @param {string} configFullName the name of the configuration as used in the eslint config(e.g. 'plugin:node/recommended'),
+     * or the absolute path to a config file. This should uniquely identify a config.
      * @param {Object} config the config object to add to the cache
      * @returns {void}
      * @private
      */
-    setConfig(configFilePath, config) {
-        this.filePathCache.set(configFilePath, config);
+    setConfig(configFullName, config) {
+        this.configFullNameCache.set(configFullName, config);
     }
 
     /**
@@ -125,6 +127,4 @@ class ConfigCache {
     setMergedConfig(vector, config) {
         this.mergedCache.set(hash(vector), config);
     }
-}
-
-module.exports = ConfigCache;
+};
diff --git a/tools/eslint/lib/config/config-file.js b/tools/eslint/lib/config/config-file.js
index 8325299528..3c790cf3be 100644
--- a/tools/eslint/lib/config/config-file.js
+++ b/tools/eslint/lib/config/config-file.js
@@ -488,12 +488,15 @@ function normalizePackageName(name, prefix) {
  * @returns {Object} An object containing 3 properties:
  * - 'filePath' (required) the resolved path that can be used directly to load the configuration.
  * - 'configName' the name of the configuration inside the plugin.
- * - 'configFullName' the name of the configuration as used in the eslint config (e.g. 'plugin:node/recommended').
+ * - 'configFullName' (required) the name of the configuration as used in the eslint config(e.g. 'plugin:node/recommended'),
+ *     or the absolute path to a config file. This should uniquely identify a config.
  * @private
  */
 function resolve(filePath, relativeTo) {
     if (isFilePath(filePath)) {
-        return { filePath: path.resolve(relativeTo || "", filePath) };
+        const fullPath = path.resolve(relativeTo || "", filePath);
+
+        return { filePath: fullPath, configFullName: fullPath };
     }
     let normalizedPackageName;
 
@@ -510,7 +513,7 @@ function resolve(filePath, relativeTo) {
     normalizedPackageName = normalizePackageName(filePath, "eslint-config");
     debug(`Attempting to resolve ${normalizedPackageName}`);
     filePath = resolver.resolve(normalizedPackageName, getLookupPath(relativeTo));
-    return { filePath };
+    return { filePath, configFullName: filePath };
 
 
 }
@@ -560,11 +563,12 @@ function loadFromDisk(resolvedPath, configContext) {
 /**
  * Loads a config object, applying extends if present.
  * @param {Object} configObject a config object to load
+ * @param {Config} configContext Context for the config instance
  * @returns {Object} the config object with extends applied if present, or the passed config if not
  * @private
  */
-function loadObject(configObject) {
-    return configObject.extends ? applyExtends(configObject, "") : configObject;
+function loadObject(configObject, configContext) {
+    return configObject.extends ? applyExtends(configObject, configContext, "") : configObject;
 }
 
 /**
@@ -579,7 +583,7 @@ function loadObject(configObject) {
 function load(filePath, configContext, relativeTo) {
     const resolvedPath = resolve(filePath, relativeTo);
 
-    const cachedConfig = configContext.configCache.getConfig(resolvedPath.filePath);
+    const cachedConfig = configContext.configCache.getConfig(resolvedPath.configFullName);
 
     if (cachedConfig) {
         return cachedConfig;
@@ -590,7 +594,7 @@ function load(filePath, configContext, relativeTo) {
     if (config) {
         config.filePath = resolvedPath.filePath;
         config.baseDirectory = path.dirname(resolvedPath.filePath);
-        configContext.configCache.setConfig(resolvedPath.filePath, config);
+        configContext.configCache.setConfig(resolvedPath.configFullName, config);
     }
 
     return config;
diff --git a/tools/eslint/lib/rules/indent.js b/tools/eslint/lib/rules/indent.js
index 52d08ff3d5..3027e77204 100644
--- a/tools/eslint/lib/rules/indent.js
+++ b/tools/eslint/lib/rules/indent.js
@@ -220,8 +220,8 @@ class OffsetStorage {
 
     /**
      * Sets the offset column of token B to match the offset column of token A.
-     * This is different from matchIndentOf because it matches a *column*, even if baseToken is not
-     * the first token on its line.
+     * **WARNING**: This is different from matchIndentOf because it matches a *column*, even if baseToken is not
+     * the first token on its line. In most cases, `matchIndentOf` should be used instead.
      * @param {Token} baseToken The first token
      * @param {Token} offsetToken The second token, whose offset should be matched to the first token
      * @returns {void}
@@ -239,12 +239,62 @@ class OffsetStorage {
     }
 
     /**
-    * Sets the desired offset of a token
-    * @param {Token} token The token
-    * @param {Token} offsetFrom The token that this is offset from
-    * @param {number} offset The desired indent level
-    * @returns {void}
-    */
+     * Sets the desired offset of a token.
+     *
+     * This uses a line-based offset collapsing behavior to handle tokens on the same line.
+     * For example, consider the following two cases:
+     *
+     * (
+     *     [
+     *         bar
+     *     ]
+     * )
+     *
+     * ([
+     *     bar
+     * ])
+     *
+     * Based on the first case, it's clear that the `bar` token needs to have an offset of 1 indent level (4 spaces) from
+     * the `[` token, and the `[` token has to have an offset of 1 indent level from the `(` token. Since the `(` token is
+     * the first on its line (with an indent of 0 spaces), the `bar` token needs to be offset by 2 indent levels (8 spaces)
+     * from the start of its line.
+     *
+     * However, in the second case `bar` should only be indented by 4 spaces. This is because the offset of 1 indent level
+     * between the `(` and the `[` tokens gets "collapsed" because the two tokens are on the same line. As a result, the
+     * `(` token is mapped to the `[` token with an offset of 0, and the rule correctly decides that `bar` should be indented
+     * by 1 indent level from the start of the line.
+     *
+     * This is useful because rule listeners can usually just call `setDesiredOffset` for all the tokens in the node,
+     * without needing to check which lines those tokens are on.
+     *
+     * Note that since collapsing only occurs when two tokens are on the same line, there are a few cases where non-intuitive
+     * behavior can occur. For example, consider the following cases:
+     *
+     * foo(
+     * ).
+     *     bar(
+     *         baz
+     *     )
+     *
+     * foo(
+     * ).bar(
+     *     baz
+     * )
+     *
+     * Based on the first example, it would seem that `bar` should be offset by 1 indent level from `foo`, and `baz`
+     * should be offset by 1 indent level from `bar`. However, this is not correct, because it would result in `baz`
+     * being indented by 2 indent levels in the second case (since `foo`, `bar`, and `baz` are all on separate lines, no
+     * collapsing would occur).
+     *
+     * Instead, the correct way would be to offset `baz` by 1 level from `bar`, offset `bar` by 1 level from the `)`, and
+     * offset the `)` by 0 levels from `foo`. This ensures that the offset between `bar` and the `)` are correctly collapsed
+     * in the second case.
+     *
+     * @param {Token} token The token
+     * @param {Token} offsetFrom The token that `token` should be offset from
+     * @param {number} offset The desired indent level
+     * @returns {void}
+     */
     setDesiredOffset(token, offsetFrom, offset) {
         if (offsetFrom && token.loc.start.line === offsetFrom.loc.start.line) {
             this.matchIndentOf(offsetFrom, token);
diff --git a/tools/eslint/package-lock.json b/tools/eslint/package-lock.json
index 4f78e2baa5..0718fa08a8 100644
--- a/tools/eslint/package-lock.json
+++ b/tools/eslint/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "eslint",
-  "version": "4.1.0",
+  "version": "4.1.1",
   "lockfileVersion": 1,
   "dependencies": {
     "acorn": {
diff --git a/tools/eslint/package.json b/tools/eslint/package.json
index f66abf07fb..50fb36855d 100644
--- a/tools/eslint/package.json
+++ b/tools/eslint/package.json
@@ -1,27 +1,27 @@
 {
-  "_from": "eslint@4.1.0",
-  "_id": "eslint@4.1.0",
+  "_from": "eslint@latest",
+  "_id": "eslint@4.1.1",
   "_inBundle": false,
-  "_integrity": "sha1-u7VaKCIO4Itp2pVU1FprLr/X2RM=",
+  "_integrity": "sha1-+svfz+Pg+s06i4DcmMTmwTrlgt8=",
   "_location": "/eslint",
   "_phantomChildren": {},
   "_requested": {
-    "type": "version",
+    "type": "tag",
     "registry": true,
-    "raw": "eslint@4.1.0",
+    "raw": "eslint@latest",
     "name": "eslint",
     "escapedName": "eslint",
-    "rawSpec": "4.1.0",
+    "rawSpec": "latest",
     "saveSpec": null,
-    "fetchSpec": "4.1.0"
+    "fetchSpec": "latest"
   },
   "_requiredBy": [
     "#USER",
     "/"
   ],
-  "_resolved": "https://registry.npmjs.org/eslint/-/eslint-4.1.0.tgz",
-  "_shasum": "bbb55a28220ee08b69da9554d45a6b2ebfd7d913",
-  "_spec": "eslint@4.1.0",
+  "_resolved": "https://registry.npmjs.org/eslint/-/eslint-4.1.1.tgz",
+  "_shasum": "facbdfcfe3e0facd3a8b80dc98c4e6c13ae582df",
+  "_spec": "eslint@latest",
   "_where": "/Users/trott/io.js/tools/eslint-tmp",
   "author": {
     "name": "Nicholas C. Zakas",
@@ -152,5 +152,5 @@
     "release": "node Makefile.js release",
     "test": "node Makefile.js test"
   },
-  "version": "4.1.0"
+  "version": "4.1.1"
 }