{"action":"opened","number":4311,"pull_request":{"url":"https://api.github.com/repos/nodejs/node/pulls/4311","id":53875684,"html_url":"https://github.com/nodejs/node/pull/4311","diff_url":"https://github.com/nodejs/node/pull/4311.diff","patch_url":"https://github.com/nodejs/node/pull/4311.patch","issue_url":"https://api.github.com/repos/nodejs/node/issues/4311","number":4311,"state":"open","locked":false,"title":"lib: externalized messages support","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":"@nodejs/ctc @nodejs/collaborators ...\r\n\r\nexternalizing the error and output messages in lib\r\n\r\n* the approach taken here is derived from the template\r\n  string based mechanism described [here](http://jaysoo.ca/2014/03/20/i18n-with-es6-template-strings/)\r\n* this is an alternative approach to the ICU based approach\r\n  that I am working on in https://github.com/nodejs/node/pull/3413\r\n\r\nThis introduces a new internal/messages module that exports a\r\ntemplate string tag function. The externalized messages are in\r\ninternal/messages_en.js for now but can be moved to a different\r\nlocation.\r\n\r\nWithin the lib src, we can use this mechanism using tagged template\r\nstrings:\r\n\r\n```\r\nconst I18N = require('internal/messages');\r\n\r\nconst foo = 'testing';\r\nthrow new Error(I18N`Example error: ${foo}`);\r\n```\r\n\r\nIn the `messages_en.js` file, we'd have something like:\r\n\r\n```\r\n{\r\n  ...,\r\n  \"Example error: {0}\": {\r\n    \"key\": \"ERR000009\"\r\n  },\r\n  ...\r\n}\r\n```\r\n\r\nThe template string would expand into:\r\n\r\n  `ERR000009: Example Error: testing`\r\n\r\nLater on, when we get into actually translating messages, we\r\nwould have other message_{locale}.js files (or however else we'd\r\nlike to separate it out) that would look something like:\r\n\r\n```\r\n{\r\n  ...,\r\n  \"Example error: {0}\": {\r\n    \"key\": \"ERR000009\",\r\n    \"value\": \"Ejemplo de error: {0}\"\r\n}\r\n```\r\n\r\nI'm not yet convinced this approach is ideal, but it's functional.\r\nThere are a few gotchas with template strings currently that are less\r\nthan ideal (e.g. line wrapping issues, lookup is a bit inefficient).\r\n\r\nGetting this out now, tho, to solicit input on the approach.\r\n\r\nThis is still a work in 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