micromark-util-events-to-acorn

micromark utility to try and parse events with acorn.

Contents

• Install
• Use
• API
  • eventsToAcorn(events, options)
  • Options
  • Result
• Types
• Compatibility
• Security
• Contribute
• License

Install

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

npm install micromark-util-events-to-acorn

In Deno with esm.sh:

import {eventsToAcorn} from 'https://esm.sh/micromark-util-events-to-acorn@2'

In browsers with esm.sh:

<script type="module">
  import {eventsToAcorn} from 'https://esm.sh/micromark-util-events-to-acorn@2?bundle'
</script>

Use

import {eventsToAcorn} from 'micromark-util-events-to-acorn'

// A factory that uses the utility:
/** @type {Tokenizer} */
function factoryMdxExpression(effects, ok, nok) {
  return start

  // …

    // …

    // Gnostic mode: parse w/ acorn.
    const result = eventsToAcorn(this.events.slice(eventStart), {
      acorn,
      acornOptions,
      start: pointStart,
      expression: true,
      allowEmpty,
      prefix: spread ? '({' : '',
      suffix: spread ? '})' : ''
    })

    // …

  // …
}

API

This module exports the identifier eventsToAcorn. There is no default export.

The export map supports the development condition. Run node --conditions development module.js to get instrumented dev code. Without this condition, production code is loaded.

eventsToAcorn(events, options)

Parameters

• events (Array<Event>) — events
• options (Options) — configuration (required)

Returns

Result (Result).

Options

Configuration (TypeScript type).

Fields

• acorn (Acorn, required) — typically acorn, object with parse and parseExpressionAt fields
• tokenTypes (Array<TokenType>], required) — names of (void) tokens to consider as data; 'lineEnding' is always included
• acornOptions (AcornOptions, optional) — configuration for acorn
• start (Point, optional, required if allowEmpty) — place where events start
• prefix (string, default: '') — text to place before events
• suffix (string, default: '') — text to place after events
• expression (boolean, default: false) — whether this is a program or expression
• allowEmpty (boolean, default: false) — whether an empty expression is allowed (programs are always allowed to be empty)

Result

Result (TypeScript type).

Fields

• estree (Program or undefined) — Program
• error (Error or undefined) — error if unparseable
• swallow (boolean) — whether the error, if there is one, can be swallowed and more JavaScript could be valid

Types

This package is fully typed with TypeScript. It exports the additional types Acorn, AcornOptions, Options, and Result.

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, micromark-util-events-to-acorn@^2, compatible with Node.js 16.

This package works with micromark version 3 and later.

Security

This package is safe.

Contribute

See contributing.md in micromark/.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, organisation, or community you agree to abide by its terms.

License

MIT © Titus Wormer