通过 Webpack 插件查找所有函数调用 [英] Finding all function calls through a Webpack plugin
问题描述
我正在编写一个 Webpack 插件,它将查找对 i18n/translation 函数的所有引用,目的是查找所有需要翻译的文本,然后将它们上传到翻译服务.
I'm writing a Webpack plugin that will find all references to i18n/translation functions with the aim of finding all texts that need translations and then uploading them to a translation service.
关于如何开始的任何指示?我应该使用哪些钩子?
Any pointers on how to get started? Which hooks should I be using?
推荐答案
最终使用 compiler.hooks.compilation
获取编译对象,然后在 Webpack 解析源代码时钩入以下内容:
Ended up using compiler.hooks.compilation
to get the compilation object, then the following to hook into when Webpack parses source code:
normalModuleFactory.hooks.parser
.for('javascript/auto')
.tap(pluginName, parserHandler);
normalModuleFactory.hooks.parser
.for('javascript/dynamic')
.tap(pluginName, parserHandler);
normalModuleFactory.hooks.parser
.for('javascript/esm')
.tap(pluginName, parserHandler);
而 parserHandler 使用 parser.hooks.evaluate
钩子来查找函数和方法调用.这部分有点棘手,因为 Webpack 需要被愚弄到认为 CallExpression 被调用者是标识符,否则 Webpack 不会在您感兴趣的方法/函数调用上调用钩子.
And parserHandler uses parser.hooks.evaluate
hooks to find function and method calls. This part is a bit tricky, because Webpack needs to be fooled into thinking CallExpression callee's are identifiers, otherwise Webpack won't call hooks on method/function calls you're interested in.
像这样:
// Handler for tricking Webpack into running hooks on expressions we're interested in,
// because it doesn't do it otherwise
const evaluateHandler = (expr: Identifier | MemberExpression) => {
const funcName = isMemberExpression(expr)
? expr.property.name
: expr.name;
if (isCorrectFunction(funcName)) {
return new BasicEvaluatedExpression()
.setRange(expr.range)
.setExpression(expr)
.setIdentifier(SPECIAL_IDENTIFIER);
}
};
// Find all relevant function calls and mark them as identifiers to trick Webpack
// Into invoking the `call` hooks for these CallExpressions
parser.hooks.evaluate
.for('MemberExpression')
.tap(pluginName, evaluateHandler);
// Do the same for when functions are destructured out of the parent object
// These are actually Identifiers, but the Parser implementation doesn't mark them so for some reason
parser.hooks.evaluate
.for('Identifier')
.tap(pluginName, evaluateHandler);
// Get all relevant function call CallExpressions
parser.hooks.call
.for(SPECIAL_IDENTIFIER)
.tap(
pluginName,
(expr: CallExpression<MemberExpression | Identifier>) => {
// FUNCTION CALL FOUND HERE
}
);
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