esast-util-from-estree

esast utility to transform from estree

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esast-util-from-estree
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esast utility to transform from estree.

Contents

*   [`fromEstree(estree[, options])`](#fromestreeestree-options)
*   [`Options`](#options)

What is this?

This package applies some transforms to a given estree to make it compatible with unist. It:
  • makes sure nodes are plain JSON
  • adds unist positions
  • normalizes .bigint
  • remove attributes, selfClosing from JSXOpeningFragment
  • removes certain discouraged fields

When should I use this?

The transform applied by this utility is often optional: estrees can be used in most places where esast can be used, and vice versa. But, if you come from a unist background and want to deal with JavaScript, or want to use unist utilities with JavaScript, this helps a lot.

Install

This package is ESM onlyesm. In Node.js (version 14.14+ and 16.0+), install with npm:
npm install esast-util-from-estree

In Deno with esm.shesmsh:
import {fromEstree} from 'https://esm.sh/esast-util-from-estree@1'

In browsers with esm.shesmsh:
<script type="module">
  import {fromEstree} from 'https://esm.sh/esast-util-from-estree@1?bundle'
</script>

Use

import {parse} from 'acorn'
import {fromEstree} from 'esast-util-from-estree'

// Make acorn support comments and positional info.
const comments = []
const esast = parse(
  'export function x() { /* Something senseless */ console.log(/(?:)/ + 1n) }',
  {sourceType: 'module', locations: true, onComment: comments}
)
esast.comments = comments

console.log(fromEstree(esast))

Yields:
{
  type: 'Program',
  body: [
    {
      type: 'ExportNamedDeclaration',
      declaration: [Object],
      specifiers: [],
      source: null,
      position: [Object]
    }
  ],
  sourceType: 'module',
  comments: [
    {
      type: 'Block',
      value: ' Something senseless ',
      position: [Object]
    }
  ],
  position: {
    start: {line: 1, column: 1, offset: 0},
    end: {line: 1, column: 75, offset: 74}
  }
}

API

This package exports the identifier fromEstreefromestree. There is no default export.

fromEstree(estree[, options])

Turn an estree into an esast.
Parameters
— estree
— configuration
Returns
esast (UnistNodeesast).

Options

Configuration (TypeScript Type).
Fields
  • dirty (boolean, default: false)
— leave discouraged fields in the tree

Types

This package is fully typed with TypeScript. It exports the additional type Optionsoptions.

Compatibility

Projects maintained by the unified collective are compatible with all maintained versions of Node.js. As of now, that is Node.js 14.14+ and 16.0+. Our projects sometimes work with older versions, but this is not guaranteed.

Contribute

See contributing.mdcontributing in syntax-tree/.githubhealth for ways to get started. See support.mdsupport for ways to get help.
This project has a code of conductcoc. By interacting with this repository, organization, or community you agree to abide by its terms.

License

MITlicense © Titus Wormerauthor