unist-util-position-from-estree

unist utility to get a position from an estree node.

Contents

• What is this?
• When should I use this?
• Install
• Use
• API
  • positionFromEstree(node)
• Types
• Compatibility
• Contribute
• License

What is this?

This package is a tiny utility that can create a proper unist position from an estree node

When should I use this?

You can use this package when you want to use other unist utilities with estree nodes.

Install

This package is ESM only. In Node.js (version 16+), install with npm:

npm install unist-util-position-from-estree

In Deno with esm.sh:

import {positionFromEstree} from 'https://esm.sh/unist-util-position-from-estree@2'

In browsers with esm.sh:

<script type="module">
  import {positionFromEstree} from 'https://esm.sh/unist-util-position-from-estree@2?bundle'
</script>

Use

import {parse} from 'acorn'
import {positionFromEstree} from 'unist-util-position-from-estree'

// Make acorn support line/column.
const node = parse('function x() { console.log(1) }', {
  ecmaVersion: 2020,
  locations: true
})

console.log(positionFromEstree(node)) // `Program`
console.log(positionFromEstree(node.body[0].id)) // `x`
console.log(positionFromEstree(node.body[0].body.body[0].expression)) // Call

Yields:

{
  start: {line: 1, column: 1, offset: 0},
  end: {line: 1, column: 32, offset: 31}
}
{
  start: {line: 1, column: 10, offset: 9},
  end: {line: 1, column: 11, offset: 10}
}
{
  start: {line: 1, column: 16, offset: 15},
  end: {line: 1, column: 30, offset: 29}
}

API

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

positionFromEstree(node)

Turn an estree node into a unist position.

Parameters

• node (Node) — estree node

Returns

unist position, if valid (Position or undefined).

Types

This package is fully typed with TypeScript. It exports no additional types.

Compatibility

Projects maintained by the unified collective are compatible with maintained versions of Node.js.

When we cut a new major release, we drop support for unmaintained versions of Node. This means we try to keep the current release line, unist-util-position-from-estree@^2, compatible with Node.js 16.

Contribute

See contributing.md in syntax-tree/.github for ways to get started. See support.md for ways to get help.

This project has a code of conduct. By interacting with this repository, organization, or community you agree to abide by its terms.

License

MIT © Titus Wormer