butternut/src/program/types/ObjectExpression.js

Experimental ES2015-aware minifier

import Node from '../Node.js';
import minifyPropertyKey from './shared/minifyPropertyKey.js';
import { UNKNOWN } from '../../utils/sentinels.js';

export default class ObjectExpression extends Node {
	getValue () {
		return UNKNOWN;
	}

	minify ( code, chars ) {
		let c = this.start;

		if ( this.properties.length ) {
			for ( let i = 0; i < this.properties.length; i += 1 ) {
				const p = this.properties[i];

				if ( p.start > c + 1 ) code.overwrite( c, p.start, i ? ',' : '{' );

				minifyPropertyKey( code, chars, p, true );
				p.value.minify( code, chars );

				c = p.end;
			}

			if ( this.end > c + 1 ) code.remove( c, this.end - 1 );
		} else if ( this.end > this.start + 2 ) {
			code.overwrite( this.start, this.end, '{}' );
		}
	}
}