René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Exported variable 'X' has or is using name 'Y' from external module \"Z\" but cannot be named.","articleBody":"**TypeScript Version:**  2.7.0-dev.20171212\r\n\r\n**Code**\r\n\r\n```ts\r\n// thingA.ts\r\nexport interface ThingA { }\r\n\r\n// thingB.ts\r\nexport interface ThingB { }\r\n\r\n// things.ts\r\nexport { ThingA } from \"./thingA\";\r\nexport * from \"./thingB\";\r\n\r\n// index.ts\r\nimport * as things from \"./things\";\r\nexport const thing1 = (param: things.ThingA) => null;\r\nexport const thing2 = (param: things.ThingB) => null;\r\n\r\n// tsconfig.json\r\n{\r\n  \"compilerOptions\": {\r\n    \"declaration\": true\r\n  }\r\n}\r\n```\r\n\r\n**Expected behavior:**\r\n\r\nProject compiles without errors.\r\n\r\n**Actual behavior:**\r\n\r\n```\r\nindex.ts(3,14): error TS4023: Exported variable 'thing2' has or is using name 'ThingB' from external module \"/Users/rob/Projects/tsctest/thingB\" but cannot be named.\r\n```\r\n\r\n**Additional information:**\r\n\r\n@weswigham fixed the following very similar issues in #19852:\r\n\r\n* #5938\r\n* #8612\r\n* #19825\r\n\r\nIn fact, before his fix, line 2 of index.ts would also fail.\r\n\r\nI've pushed this repro as a project here: https://github.com/robyoder/tsctest","author":{"url":"https://github.com/robyoder","@type":"Person","name":"robyoder"},"datePublished":"2017-12-12T22:04:33Z","url":"https://github.com/microsoft/TypeScript/issues/20657"}