[英]How to find a JavaScript variable's transitive usage through function calls?
Suppose I have access to the full set of source that could potentially be using a JavaScript variable foo
. 假设我可以访问可能使用JavaScript变量
foo
的全部源。
Some of the source code looks like this: 一些源代码如下所示:
foo.bar = 'baz';
(function(a, b, c) {
a();
b.bar = 'whee';
c();
}(fn, foo, fn));
Are there any tools available (ESLint rules, NPM modules, etc.) that could identify all usages of the foo
variable here? 是否有可用的工具(ESLint规则,NPM模块等)可以在此处标识
foo
变量的所有用法? I'm after a list of all access of the variable, including within scopes and including nested objects. 我列出了对变量的所有访问权限,包括作用域内和嵌套对象。 So, it would have to identify:
因此,它必须确定:
foo.bar
usage in the global scope foo.bar
用法 foo
usage in the function invocation foo
用法 b.bar
call is an access of foo.bar
b.bar
调用是对foo.bar
的访问 http://ternjs.net/doc/manual.html#infer seems like a good lead: http://ternjs.net/doc/manual.html#infer似乎是一个很好的线索:
infer.findRefs(ast: AST, scope: Scope, name: string, refScope: Scope, f: fn(AST, Scope))
Will traverse the given syntax tree, using scope as the starting scope, looking for references to variable name that resolve to scope refScope, and call f with the node of the reference and its local scope for each of them.
infer.findPropRefs(ast: AST, scope: Scope, objType: Obj, propName: string, f: fn(AST))
Analogous to findRefs, but used to look for references to a specific property instead. Whereas findRefs is precise, this is dependent on type inference, and thus can not be relied on to be precise.
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