解构参数：TS2339属性不存在

Question

我正在使用现有的javascript函数。我开始使用--checkJs选项，使用打字稿检查代码，即使该代码位于.js文件中。该函数在其最后一个参数上使用了解构结构，这似乎很重要，并且令人困惑...

export function foldFlowLines(
  text, indent, mode,
  { indentAtStart, lineWidth = 80, minContentWidth = 20, onFold, onOverflow }
  ) {
   // ...body containing...

   if (overflow && onOverflow) onOverflow()
   if (folds.length === 0) return text
   if (onFold) onFold()

   // ...
}

我收到以下消息：

src/foldFlowLines.js:42:66 - error TS2339: Property 'onOverflow' does not exist on type 
'{ indentAtStart?: number; lineWidth?: number; minContentWidth?: number; onFold: Function; }'.

42   { indentAtStart, lineWidth = 80, minContentWidth = 20, onFold, onOverflow }
                                                                    ^^^^^^^^^^

tsc似乎已经以某种方式推断出onFold是一种功能，这很好，但是以某种方式却在抱怨onOverflow不存在。谁能解释我为什么收到此消息？

Typescript版本3.7.5

PS：我将打字稿包更新为最新版本3.8.3，结果相同。

Answer 1

我发现了问题，这是JSDoc注释中的错误！

这是原始内容，带有细微的错误：

/**
 * Tries to keep input at up to `lineWidth` characters, splitting only on spaces
 * not followed by newlines or spaces unless `mode` is `'quoted'`. Lines are
 * terminated with `\n` and started with `indent`.
 *
 * @param {string} text
 * @param {string} indent
 * @param {string} [mode='flow'] `'block'` prevents more-indented lines
 *   from being folded; `'quoted'` allows for `\` escapes, including escaped
 *   newlines
 * @param {Object} options
 * @param {number} [options.indentAtStart] Accounts for leading contents on
 *   the first line, defaulting to `indent.length`
 * @param {number} [options.lineWidth=80]
 * @param {number} [options.minContentWidth=20] Allow highly indented lines to
 *   stretch the line width
 * @param {function} options.onFold Called once if the text is folded
 * @param {function} options.onFold Called once if any line of text exceeds
 *   lineWidth characters
 */
export function foldFlowLines(
  text,
  indent,
  mode,
  { indentAtStart, lineWidth = 80, minContentWidth = 20, onFold, onOverflow }
) { 
//... 
}

最终的@param需要从options.onFold更改为options.onOverflow。