Node.js Module Resolution by visual example
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Altamira Node.js Module Resolution Jeff Kunkle April 19, 2012
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Node.js has a very clever design for module path resolution and code loading. Most languages punt when asked to load two modules depending on different versions of a shared third module, but not Node. This presentation depicts a handful of module loading scenarios by demonstrating the filesystem layout for each.
Transcript of Node.js Module Resolution by visual example
Altamira
Node.js Module Resolution
Jeff Kunkle
April 19, 2012
Path Resolution
require(“./mymodule.js”);
1
mymodule.js
/projects/preso/
main.js
require(“./mymodule.js”);
require(“./mymodule”);
2
/projects/preso/
main.js
require(“./mymodule”);
mymodule.js
/projects/preso/
main.js
require(“./mymodule”);
mymodule.js
/projects/preso/
mymodule.json
main.js
require(“./mymodule”);
mymodule.js
/projects/preso/
mymodule.json
mymodule.node
main.js
require(“./mymodule”);
require(“./mymodule”);
/projects/preso/
main.js
mymodule/
package.json
init.js
require(“./mymodule”);
mymodule/
/projects/preso/
index.js
main.js
require(“./mymodule”);
mymodule/
/projects/preso/
index.node
main.js
require(“mymodule”);
3
require(“mymodule”);
node_modules/
/usr/local/node/lib/
index.js
mymodule/
* assuming mymodule was a core Node.js module
require(“mymodule”);
node_modules/
/projects/preso/
index.js
main.js
mymodule/
require(“mymodule”);
node_modules/
/projects/
index.js
main.js
mymodule/
preso/
require(“mymodule”);
node_modules/
/
index.js
main.js
mymodule/
projects/
preso/
require(“mymodule”);
Global load paths also exist,but don’t use them.
Dependency Resolution Magic!
A
B
Cv1.0
v2.0
a/
node_modules/
c/
b/
node_modules/
c/
b.js
a.js
c.js
c.js
./node_modules/
v1.0
v2.0
a/
b/
b.js
a.js
./node_modules/
c/
c.js
Jeff Kunkle@kunklejr
