javascript - Google Closure Annotating不会告诉我我错了

我正在尝试Google Closure，特别是用于强制类型安全的注释性内容。为了测试我做错了什么，尽管编译器不会告诉我这是...

这是代码:

// ==ClosureCompiler==
// @output_file_name default.js
// @compilation_level SIMPLE_OPTIMIZATIONS
// ==/ClosureCompiler==

/**
 * A card.
 * @constructor
 * @param {String} cardName The exact name of the card
 * @param {Kinetic.Layer} layer The layer for the card
 */
function CardObject(cardName, layer)
{
    /** @type {Number} */
    var number = cardName;
}

因此，我有一个变量number，我说它是Number，我尝试为其分配一个字符串。这应该是不可能的，对吧？尽管编译器不会告诉我...

为什么不告诉我那是错的？

最佳答案

Closure Compiler使用warning levels确定在编译过程中启用了哪些检查。三个警告级别是:

安静

默认

VERBOSE

例如，使用编译级别SIMPLE_OPTIMIZATIONS，您仍然会收到类型检查警告，并将警告级别设置为VERBOSE。

// ==ClosureCompiler==
// @output_file_name default.js
// @compilation_level SIMPLE_OPTIMIZATIONS
// @warning_level VERBOSE
// ==/ClosureCompiler==

/**
 * A card.
 * @constructor
 * @param {String} cardName The exact name of the card
 * @param {Kinetic.Layer} layer The layer for the card
 */
function CardObject(cardName, layer)
{
    /** @type {Number} */
    var number = cardName;
}

输出

Number of warnings: 2

JSC_TYPE_PARSE_ERROR: Bad type annotation. Unknown type Kinetic.Layer at line 5
character 10
* @param {Kinetic.Layer} layer The layer for the card
          ^
JSC_TYPE_MISMATCH: initializing variable
found   : (String|null|undefined)
required: (Number|null) at line 10 character 13
var number = cardName;
             ^

为了准确了解与每个警告级别相关的检查，这是WarningLevels.java中的相关代码。

安静的

/**
 * Silence all non-essential warnings.
 */
private static void silenceAllWarnings(CompilerOptions options) {
  // Just use a ShowByPath warnings guard, so that we don't have
  // to maintain a separate class of warnings guards for silencing warnings.
  options.addWarningsGuard(
      new ShowByPathWarningsGuard(
          "the_longest_path_that_cannot_be_expressed_as_a_string"));

  // Allow passes that aren't going to report anything to be skipped.

  options.checkRequires = CheckLevel.OFF;
  options.checkProvides = CheckLevel.OFF;
  options.checkMissingGetCssNameLevel = CheckLevel.OFF;
  options.aggressiveVarCheck = CheckLevel.OFF;
  options.checkTypes = false;
  options.setWarningLevel(DiagnosticGroups.CHECK_TYPES, CheckLevel.OFF);
  options.checkUnreachableCode = CheckLevel.OFF;
  options.checkMissingReturn = CheckLevel.OFF;
  options.setWarningLevel(DiagnosticGroups.ACCESS_CONTROLS, CheckLevel.OFF);
  options.setWarningLevel(DiagnosticGroups.CONST, CheckLevel.OFF);
  options.setWarningLevel(DiagnosticGroups.CONSTANT_PROPERTY, CheckLevel.OFF);
  options.checkGlobalNamesLevel = CheckLevel.OFF;
  options.checkSuspiciousCode = false;
  options.checkGlobalThisLevel = CheckLevel.OFF;
  options.setWarningLevel(DiagnosticGroups.GLOBAL_THIS, CheckLevel.OFF);
  options.setWarningLevel(DiagnosticGroups.ES5_STRICT, CheckLevel.OFF);
  options.checkCaja = false;
}

默认

/**
 * Add the default checking pass to the compilation options.
 * @param options The CompilerOptions object to set the options on.
 */
private static void addDefaultWarnings(CompilerOptions options) {
  options.checkSuspiciousCode = true;
  options.checkUnreachableCode = CheckLevel.WARNING;
  options.checkControlStructures = true;
}

详细

/**
 * Add all the check pass that are possibly relevant to a non-googler.
 * @param options The CompilerOptions object to set the options on.
 */
private static void addVerboseWarnings(CompilerOptions options) {
  addDefaultWarnings(options);

  // checkSuspiciousCode needs to be enabled for CheckGlobalThis to get run.
  options.checkSuspiciousCode = true;
  options.checkGlobalThisLevel = CheckLevel.WARNING;
  options.checkSymbols = true;
  options.checkMissingReturn = CheckLevel.WARNING;

  // checkTypes has the side-effect of asserting that the
  // correct number of arguments are passed to a function.
  // Because the CodingConvention used with the web service does not provide a
  // way for optional arguments to be specified, these warnings may result in
  // false positives.
  options.checkTypes = true;
  options.checkGlobalNamesLevel = CheckLevel.WARNING;
  options.aggressiveVarCheck = CheckLevel.WARNING;
  options.setWarningLevel(
      DiagnosticGroups.MISSING_PROPERTIES, CheckLevel.WARNING);
  options.setWarningLevel(
      DiagnosticGroups.DEPRECATED, CheckLevel.WARNING);
}

请注意，options.checkTypes = true;仅设置为VERBOSE警告级别。正如Speransky Danil指出的那样，在使用编译级别ADVANCED_OPTIMIZATIONS时，也会启用类型检查。

另外，可以使用Closure Compiler应用程序(jar文件)使用编译器标志分别控制警告的类别:

--jscomp_off

--jscomp_warning

--jscomp_error

可以指定的警告类别如下:

accessControls

ambiguousFunctionDecl

checkRegExp

checkTypes

checkVars

const

constantProperty

不推荐使用

plicateMessage

es5严格

externs验证

fileoverview标签

globalThis

internetExplorer检查

invalidCasts

缺少属性

nonStandardJsDocs

strictModuleDepCheck

类型无效

undefinedNames

undefined variable

未知定义

uselessCode

visibility

例如，可以单独启用类型检查警告:

--jscomp_warning=checkTypes

关于javascript - Google Closure Annotating不会告诉我我错了，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/12236862/