swagger-ui-dist takes an obnoxiously long time to `require()`

[jwalton]

Q	A
Bug or feature request?	bug
Which Swagger/OpenAPI version?	any
Which Swagger-UI version?	3.14.0
How did you install Swagger-UI?	npm
Which browser & version?	n/a
Which operating system?	OS/X

Expected Behavior

'swagger-ui-dist' is a package that exports a single function which gives you the name of a directory that you can serve static content from, so I'd expect require('swagger-ui-dist') to be blindingly fast.

For example:

$ time node -e 'require("path"); console.log(path.resolve(__dirname, "."))'

real	0m0.156s
user	0m0.095s
sys	0m0.052s

0.15 second, and that includes a console.log(), which is slow.

Current Behavior

$ time node -e 'require("swagger-ui-dist")'

real	0m1.439s
user	0m1.020s
sys	0m0.221s

1.4 seconds!

Context

This slows down startup of every app that users swagger-ui-dist.

[jwalton]

Actually, this is not really a fair comparison, because it includes the overhead of node.js starting:

$ node -e 'start = Date.now(); require("path"); console.log(path.resolve(__dirname, ".")); console.log(Date.now() - start);'
/Users/jwalton
3

Vs swagger-ui-dist:

$ node -e 'start = Date.now(); require("swagger-ui-dist"); console.log(Date.now() - start);'
1001

[jwalton]

By way of a workaround:

node -e 'start = Date.now(); require("swagger-ui-dist/absolute-path.js"); console.log(Date.now() - start);'
4