{"action":"created","comment":{"url":"https://api.github.com/repos/ampproject/amphtml/pulls/comments/215433801","pull_request_review_id":152699284,"id":215433801,"node_id":"MDI0OlB1bGxSZXF1ZXN0UmV2aWV3Q29tbWVudDIxNTQzMzgwMQ==","diff_hunk":"@@ -134,6 +134,27 @@ export function tryParseJson(json, opt_onFailed) {\n   }\n }\n \n+/**\n+ * Helper method to get the json config from an element <script> tag\n+ * Throws error if there is no or more than one <script> tag,\n+ * or <script> tag has type value not equal to application/json\n+ * or cannot parse the json object\n+ * @param {!Element} element\n+ * @return {?JsonObject}\n+ */\n+export function getSingleChildJsonConfig(element) {\n+  const scripts = childElementsByTag(element, 'script');\n+  if (scripts.length != 1) {\n+    throw new Error('should have (only) one <script> child');\n+  }\n+  const script = scripts[0];\n+  if (!isJsonScriptTag(script)) {\n+    throw new Error('config should be put in a <script> tag with type = ' +\n+        '\"application/json\"');\n+  }\n+  return parseJson(script.textContent);","path":"src/json.js","position":null,"original_position":33,"commit_id":"621a04f2b78c6ecc16658aa2be24855781240892","original_commit_id":"336854a3aec213721f786b22966332b404580824","user":{"login":"zhouyx","id":5419904,"node_id":"MDQ6VXNlcjU0MTk5MDQ=","avatar_url":"https://avatars0.githubusercontent.com/u/5419904?v=4","gravatar_id":"","url":"https://api.github.com/users/zhouyx","html_url":"https://github.com/zhouyx","followers_url":"https://api.github.com/users/zhouyx/followers","following_url":"https://api.github.com/users/zhouyx/following{/other_user}","gists_url":"https://api.github.com/users/zhouyx/gists{/gist_id}","starred_url":"https://api.github.com/users/zhouyx/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/zhouyx/subscriptions","organizations_url":"https://api.github.com/users/zhouyx/orgs","repos_url":"https://api.github.com/users/zhouyx/repos","events_url":"https://api.github.com/users/zhouyx/events{/privacy}","received_events_url":"https://api.github.com/users/zhouyx/received_events","type":"User","site_admin":false},"body":"Good point!\r\nNote that I didn't use `tryParseJson`, but used\r\n```\r\ntry {\r\n  parseJson\r\n} catch ...\r\n```\r\nto avoid a type check error. Because I don't want to return undefined. 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