{"action":"created","comment":{"url":"https://api.github.com/repos/nodejs/node/pulls/comments/50556163","id":50556163,"diff_hunk":"@@ -0,0 +1,60 @@\n+'use strict';\n+\n+// A process Warning is similar in structure to an Error except that they\n+// are emitted by the process.on('warn') event rather than being thrown.\n+\n+const _message = Symbol('message');\n+const _name = Symbol('name');\n+const prefix = `(${process.release.name}:${process.pid}) `;\n+\n+class Warning {\n+  constructor(name, message, constructor) {\n+    this[_name] = name;\n+    this[_message] = `${prefix}${message}`;\n+    Error.captureStackTrace(this, constructor || Warning);\n+  }\n+\n+  get message() {\n+    return this[_message];\n+  }\n+\n+  get name() {\n+    return this[_name];\n+  }\n+}\n+\n+function emit(warning) {\n+  process.nextTick(() => {\n+    process.emit('warn', warning);\n+  });","path":"lib/internal/warn.js","position":29,"original_position":29,"commit_id":"a45105693beaabdbd98bf1b7f0052fd8df4dc5aa","original_commit_id":"59b35d3f15c02bb1310f4efbefb5b4168fd8ce1d","user":{"login":"Fishrock123","id":1093990,"avatar_url":"https://avatars.githubusercontent.com/u/1093990?v=3","gravatar_id":"","url":"https://api.github.com/users/Fishrock123","html_url":"https://github.com/Fishrock123","followers_url":"https://api.github.com/users/Fishrock123/followers","following_url":"https://api.github.com/users/Fishrock123/following{/other_user}","gists_url":"https://api.github.com/users/Fishrock123/gists{/gist_id}","starred_url":"https://api.github.com/users/Fishrock123/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Fishrock123/subscriptions","organizations_url":"https://api.github.com/users/Fishrock123/orgs","repos_url":"https://api.github.com/users/Fishrock123/repos","events_url":"https://api.github.com/users/Fishrock123/events{/privacy}","received_events_url":"https://api.github.com/users/Fishrock123/received_events","type":"User","site_admin":false},"body":"Hmmm this seems fine but I don't know if I have the experience to validate that. Does anyone have specific problems that happen due to behavior like this and errors? (Well other than uncatchability, but we don't care about that here anyways.)","created_at":"2016-01-22T16:20:38Z","updated_at":"2016-01-22T16:20:38Z","html_url":"https://github.com/nodejs/node/pull/4782#discussion_r50556163","pull_request_url":"https://api.github.com/repos/nodejs/node/pulls/4782","_links":{"self":{"href":"https://api.github.com/repos/nodejs/node/pulls/comments/50556163"},"html":{"href":"https://github.com/nodejs/node/pull/4782#discussion_r50556163"},"pull_request":{"href":"https://api.github.com/repos/nodejs/node/pulls/4782"}}},"pull_request":{"url":"https://api.github.com/repos/nodejs/node/pulls/4782","id":56657402,"html_url":"https://github.com/nodejs/node/pull/4782","diff_url":"https://github.com/nodejs/node/pull/4782.diff","patch_url":"https://github.com/nodejs/node/pull/4782.patch","issue_url":"https://api.github.com/repos/nodejs/node/issues/4782","number":4782,"state":"open","locked":false,"title":"process: add 'warn' event","user":{"login":"jasnell","id":439929,"avatar_url":"https://avatars.githubusercontent.com/u/439929?v=3","gravatar_id":"","url":"https://api.github.com/users/jasnell","html_url":"https://github.com/jasnell","followers_url":"https://api.github.com/users/jasnell/followers","following_url":"https://api.github.com/users/jasnell/following{/other_user}","gists_url":"https://api.github.com/users/jasnell/gists{/gist_id}","starred_url":"https://api.github.com/users/jasnell/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jasnell/subscriptions","organizations_url":"https://api.github.com/users/jasnell/orgs","repos_url":"https://api.github.com/users/jasnell/repos","events_url":"https://api.github.com/users/jasnell/events{/privacy}","received_events_url":"https://api.github.com/users/jasnell/received_events","type":"User","site_admin":false},"body":"In several places throughout the code we write directly to stderr\r\nto report warnings (deprecation, possible eventemitter memory leak).\r\nThe current design of simply dumping the text to stderr is less\r\nthan ideal. This PR introduces a new \"Process Warnings\" mechanism\r\nthat emits 'warn' events on the global process object. These are\r\ninvoked with a `Warning` object that is similar in structure to\r\nan `Error` in that they have a name, message and stack trace.\r\n\r\nBy default, these warnings will be printed to stderr. This can be\r\nsuppressed using the `--no-warnings` command line flag, however the\r\n'warn' event will still be emitted by the process, allowing applications\r\nto handle the warnings in custom ways.\r\n\r\nThe `--trace-warnings` command line flag will tell Node.js to print\r\nthe full stack trace of warnings as part of the default handling.\r\n\r\nThe existing `--no-deprecation`, `--throw-deprecation` and\r\n`--trace-deprecation` flags continue to work as they currently do,\r\nbut the exact output of the warning message is modified to occur\r\non process.nextTick(). The stack trace for the warning, however,\r\nis preserved and shows the correct call site.\r\n\r\nTest cases and documentation are included.\r\n\r\nRefs: https://github.com/nodejs/node-eps/pull/4#issuecomment-173079195","created_at":"2016-01-20T19:47:20Z","updated_at":"2016-01-22T16:20:38Z","closed_at":null,"merged_at":null,"merge_commit_sha":"fb37c08392cb516bdda2ec22795ad41ee3b1fd75","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/nodejs/node/pulls/4782/commits","review_comments_url":"https://api.github.com/repos/nodejs/node/pulls/4782/comments","review_comment_url":"https://api.github.com/repos/nodejs/node/pulls/comments{/number}","comments_url":"https://api.github.com/repos/nodejs/node/issues/4782/comments","statuses_url":"https://api.github.com/repos/nodejs/node/statuses/a45105693beaabdbd98bf1b7f0052fd8df4dc5aa","head":{"label":"jasnell:process-warning","ref":"process-warning","sha":"a45105693beaabdbd98bf1b7f0052fd8df4dc5aa","user":{"login":"jasnell","id":439929,"avatar_url":"https://avatars.githubusercontent.com/u/439929?v=3","gravatar_id":"","url":"https://api.github.com/users/jasnell","html_url":"https://github.com/jasnell","followers_url":"https://api.github.com/users/jasnell/followers","following_url":"https://api.github.com/users/jasnell/following{/other_user}","gists_url":"https://api.github.com/users/jasnell/gists{/gist_id}","starred_url":"https://api.github.com/users/jasnell/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jasnell/subscriptions","organizations_url":"https://api.github.com/users/jasnell/orgs","repos_url":"https://api.github.com/users/jasnell/repos","events_url":"https://api.github.com/users/jasnell/events{/privacy}","received_events_url":"https://api.github.com/users/jasnell/received_events","type":"User","site_admin":false},"repo":{"id":37868459,"name":"node","full_name":"jasnell/node","owner":{"login":"jasnell","id":439929,"avatar_url":"https://avatars.githubusercontent.com/u/439929?v=3","gravatar_id":"","url":"https://api.github.com/users/jasnell","html_url":"https://github.com/jasnell","followers_url":"https://api.github.com/users/jasnell/followers","following_url":"https://api.github.com/users/jasnell/following{/other_user}","gists_url":"https://api.github.com/users/jasnell/gists{/gist_id}","starred_url":"https://api.github.com/users/jasnell/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jasnell/subscriptions","organizations_url":"https://api.github.com/users/jasnell/orgs","repos_url":"https://api.github.com/users/jasnell/repos","events_url":"https://api.github.com/users/jasnell/events{/privacy}","received_events_url":"https://api.github.com/users/jasnell/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/jasnell/node","description":"Future 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