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JavaScript Language Extensions
| TypeScript | Flow |
| released by Microsoft on October 12, 2012 | released by Facebook on November 18, 2014 |
| open source | maintained by Facebook |
| large community | small community |
| wide editor and IDE support | little to no IDE support |
| 100000+ questions on StackOverflow | 600+ questions on StackOverflow |
| supported by Express, Vue, React, Angular, etc. | supported by React only |
| many libraries | few to none libraries |