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Update README.md #871

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Apr 27, 2022
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Update README.md #871

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4 changes: 3 additions & 1 deletion README.md
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Installation
---

From NPM:
From npm:

npm install recast

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**Note:** Some of these parsers import npm packages that Recast does not directly depend upon, so please be aware you may have to run `npm install babylon@next` to use the `typescript`, `flow`, or `babylon` parsers, or `npm install acorn` to use the `acorn` parser. Only Esprima is installed by default when Recast is installed.

After calling `recast.parse`, if you're going to transform the AST, make sure that the `.original` property is preserved. With Babel, for instance, if you call `transformFromAST`, you must pass `cloneInputAst: false` in its options. ([More detail](https://github.com/babel/babel/issues/12882).

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