Type annotations can only be used in TypeScript files.ts(8010) on React-Native CLI Startup · Issue #29123 · facebook/react-native · GitHub
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Disable built-in tsLint messages on `// @flow` (flow.js) annotated files · Issue #95871 · microsoft/vscode · GitHub
Creation of d.ts mishandles case of `export const a = 34` · Issue #12734 · microsoft/TypeScript · GitHub
![error message error message](https://user-images.githubusercontent.com/551284/80104057-736a1f00-85b9-11ea-9637-25b6cfccf05c.png)
error message "Type annotations can only be used in TypeScript files" · Issue #5 · halfnelson/svelte-type-checker-vscode · GitHub
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