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Add section to migration guide about esModuleInterop change #3053

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Aug 11, 2020
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Add section to migration guide about esModuleInterop change #3053

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14 changes: 14 additions & 0 deletions source/guides/references/migration-guide.md
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Expand Up @@ -231,6 +231,20 @@ Running Cypress on Linux now requires the `libgbm` dependency (on Debian-based s
apt-get install libgtk2.0-0 libgtk-3-0 libgbm-dev libnotify-dev libgconf-2-4 libnss3 libxss1 libasound2 libxtst6 xauth xvfb
```

## TypeScript esModuleInterop

Cypress no longer forces the `esModuleInterop` compiler option for TypeScript to be `true` for spec, support, and plugin files. We recommend setting it in your project's `tsconfig.json` instead if you need to.

```json
// tsconfig.json
{
"compilerOptions": {
"esModuleInterop": true,
/* ... other compiler options ... */
}
}
```

## TypeScript 3.4+ support

Cypress 5.0 raises minimum required TypeScript version from 2.9+ to 3.4+. You'll need to have TypeScript 3.4+ installed within your project to have TypeScript support within Cypress.
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