node.js 需要()缓存 - 可能无效? [英] node.js require() cache - possible to invalidate?

问题描述

From the node.js documentation:

Modules are cached after the first time they are loaded. This means (among other things) that every call to require('foo') will get exactly the same object returned, if it would resolve to the same file.

Is there a way to invalidate this cache? i.e. for unit testing, I'd like each test to be working on a fresh object.

解决方案

You can always safely delete an entry in require.cache without a problem, even when there are circular dependencies. Because when you delete, you just delete a reference to the cached module object, not the module object itself, the module object will not be GCed because in case of circular dependencies, there is still a object referencing this module object.

Suppose you have:

script a.js:

var b=require('./b.js').b;
exports.a='a from a.js';
exports.b=b;

and script b.js:

var a=require('./a.js').a;
exports.b='b from b.js';
exports.a=a;

when you do:

var a=require('./a.js')
var b=require('./b.js')

you will get:

> a
{ a: 'a from a.js', b: 'b from b.js' }
> b
{ b: 'b from b.js', a: undefined }

now if you edit your b.js:

var a=require('./a.js').a;
exports.b='b from b.js. changed value';
exports.a=a;

and do:

delete require.cache[require.resolve('./b.js')]
b=require('./b.js')

you will get:

> a
{ a: 'a from a.js', b: 'b from b.js' }
> b
{ b: 'b from b.js. changed value',
  a: 'a from a.js' }

===

The above is valid if directly running node.js. However, if using tools that have their own module caching system, such as jest, the correct statement would be:

jest.resetModules();

这篇关于node.js 需要()缓存 - 可能无效?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！