@jsep-plugin/arrow

@jsep-plugin/arrow

A JSEP plugin for adding arrow-function support. Allows expressions of the form:

jsep('a.find(v => v === 1)');
jsep('a.map((v, i) => i)');
jsep('a.map(() => true');

Install

npm install @jsep-plugin/arrow

# or
yarn add @jsep-plugin/arrow

Usage

import jsep from 'jsep';
import jsepArrow from '@jsep-plugin/arrow';
jsep.plugins.register(jsepArrow);

Meta

LICENSE (MIT)

Changelog

1.0.0 - 2021-08-22

Rewrote to ESM, added a plugin system, and fixed numerous grammar issues. For most standard use-cases, this release should not be a breaking change, as every effort was made to maintain compatibility.

Breaking Changes

• renamed build folder to dist (#130). The package file structure is now:

├── CHANGELOG.md
├── LICENSE
├── README.md
├── package.json
├── dist
│   ├── jsep.js
│   ├── jsep.min.js
│   ├── cjs
│   │   ├── jsep.cjs.js
│   │   ├── jsep.cjs.min.js
│   ├── iife
│   │   ├── jsep.iife.js
│   │   ├── jsep.iife.min.js

• Removed LogicalExpression and treat it as a BinaryExpression (#100)
• Call arguments must be either all comma-separated or all space-separated, but not mixed
• unary expressions with no argument now throw missing unaryOp argument
• binary expressions now require the left-hand side to exist
• conditional (ternary) expressions with no condition now throw unexpected "?"
• . now throws unexpected .
• ()() now throws unexpected "("
• a.this, a.true, a.false, a.null now match esprima and treat the property as an identifier instead of a literal or ThisExpression

Added

• Added a plugin system, including plugins for
  • arrow expressions (() => ...)
  • assigment and update expressions (a = 2, a++)
  • async/await (await a.find(async (v1, v2) => await v1(v2)))
  • comments (/* .. */ and // ...)
  • new expressions (new Date())
  • object expressions ({a: 1, b})
  • regex support (/123/ig)
  • spread operator (fn(...a), [1, ...b], {...c})
  • template expressions (`hi ${name}`, msg`hig ${name}`)

Updated

• (1, 2) now returns a SequenceExpression instead of throwing an Unclosed ( error
• moved the ConditionExpression (ternary) into a plugin, but it is still included by default