Method forIn

lib/compile/codegen/index.ts:637–648

(
    nameOrPrefix: Name | string,
    obj: Code,
    forBody: (item: Name) => void,
    varKind: Code = this.opts.es5 ? varKinds.var : varKinds.const
  )

  // `for-in` statement.
  // With option `ownProperties` replaced with a `for-of` loop for object keys
  forIn(
    nameOrPrefix: Name | string,
    obj: Code,
    forBody: (item: Name) => void,
    varKind: Code = this.opts.es5 ? varKinds.var : varKinds.const
  ): CodeGen {
    if (this.opts.ownProperties) {
      return this.forOf(nameOrPrefix, _`Object.keys(${obj})`, forBody)
    }
    const name = this._scope.toName(nameOrPrefix)
    return this._for(new ForIter("in", varKind, name, obj), () => forBody(name))
  }

  // end `for` loop
  endFor(): CodeGen {