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Edit: README.md
# Acorn loose parser An error-tolerant JavaScript parser written in JavaScript. This parser will parse _any_ text into an [ESTree](https://github.com/estree/estree) syntax tree that is a reasonable approximation of what it might mean as a JavaScript program. It will, to recover from missing brackets, treat whitespace as significant, which has the downside that it might mis-parse a valid but weirdly indented file. It is recommended to always try a parse with the regular `acorn` parser first, and only fall back to this parser when that one finds syntax errors. ## Community Acorn is open source software released under an [MIT license](https://github.com/acornjs/acorn/blob/master/acorn-loose/LICENSE). You are welcome to [report bugs](https://github.com/acornjs/acorn/issues) or create pull requests on [github](https://github.com/acornjs/acorn). For questions and discussion, please use the [Tern discussion forum](https://discuss.ternjs.net). ## Installation The easiest way to install acorn-loose is from [`npm`](https://www.npmjs.com/): ```sh npm install acorn-loose ``` Alternately, you can download the source and build acorn yourself: ```sh git clone https://github.com/acornjs/acorn.git cd acorn npm install ``` ## Interface **parse**`(input, options)` takes an input string and a set of options (the same options as [acorn](https://github.com/acornjs/acorn/blob/master/acorn/README.md) takes), and returns a syntax tree, even if the code isn't syntactically valid. It'll insert identifier nodes with name `"✖"` as placeholders in places where it can't make sense of the input. Depends on the `acorn` package, because it uses the same tokenizer. ```javascript var acornLoose = require("acorn-loose"); console.log(acornLoose.parse("1 / * 4 )[2]", {ecmaVersion: 2020})); ``` Like the regular parser, the loose parser supports plugins. You can take the **`LooseParser`** class exported by the module, and call its static `extend` method with one or more plugins to get a customized parser class. The class has a static `parse` method that acts like the top-level `parse` method. **isDummy**`(node)` takes a `Node` and returns `true` if it is a dummy node inserted by the parser. The function performs a simple equality check on the node's name.
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