tools: update ESLint to version 2.1.0

Update ESLint to 2.1.0. ESLint has a number of potentially-useful new
features but this change attempts to be minimal in its changes.
However, some things could not be avoided reasonably.

ESLint 2.1.0 found a few lint issues that ESLing 1.x missed with
template strings that did not take advantage of any features of
template strings, and `let` declarations where `const` sufficed.

Additionally, ESLint 2.1.0 removes some granularity around enabling ES6
features. Some features (e.g., spread operator) that had been turned off
in our configuration for ESLint 1.x are now permitted.

PR-URL: https://github.com/nodejs/node/pull/5214
Reviewed-By: Michaël Zasso <mic.besace@gmail.com>
Reviewed-By: jbergstroem - Johan Bergström <bugs@bergstroem.nu>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: Myles Borins <myles.borins@gmail.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/tools/eslint/lib/cli.js b/tools/eslint/lib/cli.js
index 2201367866..979060d3f9 100644
--- a/tools/eslint/lib/cli.js
+++ b/tools/eslint/lib/cli.js
@@ -158,6 +158,22 @@ var cli = {
             }
 
             engine = new CLIEngine(translateOptions(currentOptions));
+            if (currentOptions.printConfig) {
+                if (files.length !== 1) {
+                    log.error("The --print-config option requires a " +
+                        "single file as positional argument.");
+                    return 1;
+                }
+
+                if (text) {
+                    log.error("The --print-config option is not available for piped-in code.");
+                    return 1;
+                }
+
+                var fileConfig = engine.getConfigForFile(files[0]);
+                log.info(JSON.stringify(fileConfig, null, "  "));
+                return 0;
+            }
 
             report = text ? engine.executeOnText(text, currentOptions.stdinFilename) : engine.executeOnFiles(files);
             if (currentOptions.fix) {