@philpl/buble/src/program/types/Property.js

The blazing fast, batteries-included ES2015 compiler

import CompileError from '../../utils/CompileError.js';
import Node from '../Node.js';
import reserved from '../../utils/reserved.js';

export default class Property extends Node {
	initialise(transforms) {
		if ((this.kind === 'get' || this.kind === 'set') && transforms.getterSetter) {
			CompileError.missingTransform("getters and setters", "getterSetter", this);
		}
		super.initialise(transforms);
	}

	transpile(code, transforms) {
		super.transpile(code, transforms);

		if (
			transforms.conciseMethodProperty &&
			!this.computed &&
			this.parent.type !== 'ObjectPattern'
		) {
			if (this.shorthand) {
				code.prependRight(this.start, `${this.key.name}: `);
			} else if (this.method) {
				let name = '';
				if (this.program.options.namedFunctionExpressions !== false) {
					if (
						this.key.type === 'Literal' &&
						typeof this.key.value === 'number'
					) {
						name = '';
					} else if (this.key.type === 'Identifier') {
						if (
							reserved[this.key.name] ||
							!/^[a-z_$][a-z0-9_$]*$/i.test(this.key.name) ||
							this.value.body.scope.references[this.key.name]
						) {
							name = this.findScope(true).createIdentifier(this.key.name);
						} else {
							name = this.key.name;
						}
					} else {
						name = this.findScope(true).createIdentifier(this.key.value);
					}
					name = ' ' + name;
				}

				if (this.start < this.key.start) code.remove(this.start, this.key.start);
				code.appendLeft(
					this.key.end,
					`: ${this.value.async ? 'async ' : ''}function${this.value.generator ? '*' : ''}${name}`
				);
			}
		}

		if (transforms.reservedProperties && reserved[this.key.name]) {
			code.prependRight(this.key.start, `'`);
			code.appendLeft(this.key.end, `'`);
		}
	}
}