tricky way to parse es6 template string

es6-template-string.js

const parseEs6String = (str: string, ctx: Record<string, string>) => {
  return new Function(`
    const proxy = new Proxy(${JSON.stringify(ctx)}, {
      has() { return true },
      get(obj, prop) {
        if (prop === Symbol.unscopables) return false
        if (prop in obj) return obj[prop]
        if (prop in window) return window[prop]
        return ''
      }
    })
    with(proxy) {
      return \`${str}\`
    }
    return ''
  `)()
}

console.log(parseEs6String('hello ${name}', {name: 'world'})) // 'hello world'

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