Folders as modules within folders as modules NodeJS
I am having trouble requiring from parent directories within NodeJS. I have read this post, but still couldn't figure it out.
node.js require from parent folder
This is my file structure:
-- components/
-- windows/
-- index.js
-- index.js
-- main.js
This is the code:
// /main.js
var components = require("./components")
components.windows.inner()
// /components/index.js
module.exports = {
windows: require("./windows"),
foo: "foo",
}
// /components/windows/index.js
var components = require("./..")
module.exports.inner = function() {
console.log(components.foo)
}
When I run main.js, the inner() function prints undefined.
Why is it printing undefined? Shouldn't it print foo? Am I missing something about how Node works?
javascript node.js node-modules circular-dependency
edited Nov 11 at 17:40
Bergi
363k57540864
asked Nov 11 at 17:31
Matt X
1138
add a comment |
I am having trouble requiring from parent directories within NodeJS. I have read this post, but still couldn't figure it out.
node.js require from parent folder
This is my file structure:
-- components/
-- windows/
-- index.js
-- index.js
-- main.js
This is the code:
// /main.js
var components = require("./components")
components.windows.inner()
// /components/index.js
module.exports = {
windows: require("./windows"),
foo: "foo",
}
// /components/windows/index.js
var components = require("./..")
module.exports.inner = function() {
console.log(components.foo)
}
When I run main.js, the inner() function prints undefined.
Why is it printing undefined? Shouldn't it print foo? Am I missing something about how Node works?
javascript node.js node-modules circular-dependency
edited Nov 11 at 17:40
Bergi
363k57540864
asked Nov 11 at 17:31
Matt X
1138
1
You have a circular dependency, that's what doesn't work.require("./..")returns an empty object, the export that gets later overwritten by themodule.exports =assignment incomponents/index.js. Use dependency injection instead.
– Bergi
Nov 11 at 17:38
What is dependency injection? @Bergi
– Matt X
Nov 11 at 17:41
add a comment |
I am having trouble requiring from parent directories within NodeJS. I have read this post, but still couldn't figure it out.
node.js require from parent folder
This is my file structure:
-- components/
-- windows/
-- index.js
-- index.js
-- main.js
This is the code:
// /main.js
var components = require("./components")
components.windows.inner()
// /components/index.js
module.exports = {
windows: require("./windows"),
foo: "foo",
}
// /components/windows/index.js
var components = require("./..")
module.exports.inner = function() {
console.log(components.foo)
}
When I run main.js, the inner() function prints undefined.
Why is it printing undefined? Shouldn't it print foo? Am I missing something about how Node works?
javascript node.js node-modules circular-dependency
edited Nov 11 at 17:40
Bergi
363k57540864
asked Nov 11 at 17:31
Matt X
1138
I am having trouble requiring from parent directories within NodeJS. I have read this post, but still couldn't figure it out.
node.js require from parent folder
This is my file structure:
-- components/
-- windows/
-- index.js
-- index.js
-- main.js
This is the code:
// /main.js
var components = require("./components")
components.windows.inner()
// /components/index.js
module.exports = {
windows: require("./windows"),
foo: "foo",
}
// /components/windows/index.js
var components = require("./..")
module.exports.inner = function() {
console.log(components.foo)
}
When I run main.js, the inner() function prints undefined.
Why is it printing undefined? Shouldn't it print foo? Am I missing something about how Node works?
javascript node.js node-modules circular-dependency
javascript node.js node-modules circular-dependency
edited Nov 11 at 17:40
Bergi
363k57540864
asked Nov 11 at 17:31
Matt X
1138
edited Nov 11 at 17:40
Bergi
363k57540864
asked Nov 11 at 17:31
Matt X
1138
edited Nov 11 at 17:40
Bergi
363k57540864
edited Nov 11 at 17:40
Bergi
363k57540864
edited Nov 11 at 17:40
Bergi
363k57540864
363k57540864
asked Nov 11 at 17:31
Matt X
1138
asked Nov 11 at 17:31
Matt X
1138
asked Nov 11 at 17:31
Matt X
1138
1138
1
You have a circular dependency, that's what doesn't work.require("./..")returns an empty object, the export that gets later overwritten by themodule.exports =assignment incomponents/index.js. Use dependency injection instead.
– Bergi
Nov 11 at 17:38
What is dependency injection? @Bergi
– Matt X
Nov 11 at 17:41
add a comment |
1
You have a circular dependency, that's what doesn't work.require("./..")returns an empty object, the export that gets later overwritten by themodule.exports =assignment incomponents/index.js. Use dependency injection instead.
– Bergi
Nov 11 at 17:38
What is dependency injection? @Bergi
– Matt X
Nov 11 at 17:41
1
1
You have a circular dependency, that's what doesn't work.
require("./..") returns an empty object, the export that gets later overwritten by the module.exports = assignment in components/index.js. Use dependency injection instead.– Bergi
Nov 11 at 17:38
You have a circular dependency, that's what doesn't work.
require("./..") returns an empty object, the export that gets later overwritten by the module.exports = assignment in components/index.js. Use dependency injection instead.– Bergi
Nov 11 at 17:38
What is dependency injection? @Bergi
– Matt X
Nov 11 at 17:41
What is dependency injection? @Bergi
– Matt X
Nov 11 at 17:41
add a comment |
1 Answer
1
active
oldest
votes
You just built up a "circular dependency". /components/windows/ requires /components/, which requires /components/windows/, which requires ...
To resolve those nevertheless, NodeJS initializes the exports to an empty object and rewrites them to the exports object after the module initialized. Therefore you can access /components/windows from inside /components/ but not the other way round.
To remove the circular dependency, move foo to another file that you require in both modules.
answered Nov 11 at 17:40
Jonas Wilms
54.8k42749
so, does it make sense to movefoointowindows/?
– Matt X
Nov 11 at 17:43
@matt yes it would.
– Jonas Wilms
Nov 11 at 17:43
add a comment |
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1 Answer
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1 Answer
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active
oldest
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oldest
votes
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oldest
votes
You just built up a "circular dependency". /components/windows/ requires /components/, which requires /components/windows/, which requires ...
To resolve those nevertheless, NodeJS initializes the exports to an empty object and rewrites them to the exports object after the module initialized. Therefore you can access /components/windows from inside /components/ but not the other way round.
To remove the circular dependency, move foo to another file that you require in both modules.
answered Nov 11 at 17:40
Jonas Wilms
54.8k42749
so, does it make sense to movefoointowindows/?
– Matt X
Nov 11 at 17:43
@matt yes it would.
– Jonas Wilms
Nov 11 at 17:43
add a comment |
You just built up a "circular dependency". /components/windows/ requires /components/, which requires /components/windows/, which requires ...
To resolve those nevertheless, NodeJS initializes the exports to an empty object and rewrites them to the exports object after the module initialized. Therefore you can access /components/windows from inside /components/ but not the other way round.
To remove the circular dependency, move foo to another file that you require in both modules.
answered Nov 11 at 17:40
Jonas Wilms
54.8k42749
so, does it make sense to movefoointowindows/?
– Matt X
Nov 11 at 17:43
@matt yes it would.
– Jonas Wilms
Nov 11 at 17:43
add a comment |
You just built up a "circular dependency". /components/windows/ requires /components/, which requires /components/windows/, which requires ...
To resolve those nevertheless, NodeJS initializes the exports to an empty object and rewrites them to the exports object after the module initialized. Therefore you can access /components/windows from inside /components/ but not the other way round.
To remove the circular dependency, move foo to another file that you require in both modules.
answered Nov 11 at 17:40
Jonas Wilms
54.8k42749
You just built up a "circular dependency". /components/windows/ requires /components/, which requires /components/windows/, which requires ...
To resolve those nevertheless, NodeJS initializes the exports to an empty object and rewrites them to the exports object after the module initialized. Therefore you can access /components/windows from inside /components/ but not the other way round.
To remove the circular dependency, move foo to another file that you require in both modules.
answered Nov 11 at 17:40
Jonas Wilms
54.8k42749
answered Nov 11 at 17:40
Jonas Wilms
54.8k42749
answered Nov 11 at 17:40
Jonas Wilms
54.8k42749
answered Nov 11 at 17:40
Jonas Wilms
54.8k42749
54.8k42749
so, does it make sense to movefoointowindows/?
– Matt X
Nov 11 at 17:43
@matt yes it would.
– Jonas Wilms
Nov 11 at 17:43
add a comment |
so, does it make sense to movefoointowindows/?
– Matt X
Nov 11 at 17:43
@matt yes it would.
– Jonas Wilms
Nov 11 at 17:43
so, does it make sense to move
foo into windows/?– Matt X
Nov 11 at 17:43
so, does it make sense to move
foo into windows/?– Matt X
Nov 11 at 17:43
@matt yes it would.
– Jonas Wilms
Nov 11 at 17:43
@matt yes it would.
– Jonas Wilms
Nov 11 at 17:43
add a comment |
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1
You have a circular dependency, that's what doesn't work.
require("./..")returns an empty object, the export that gets later overwritten by themodule.exports =assignment incomponents/index.js. Use dependency injection instead.– Bergi
Nov 11 at 17:38
What is dependency injection? @Bergi
– Matt X
Nov 11 at 17:41