Can't have dot in custom variable's key - could not be found.

[ozbillwang]

This is a (Bug Report / Feature Proposal)

Description

For bug reports:

• What went wrong?

If the variable in custom has dot, serverless will always report could not be found.

• What was the config you used?

$ cat dev.yml
version:
  v1.0: value-1
  v2.0: value-2

When I reference the variable ${self:custom.version.v1.0}, always got the error:

could not be found.

I understand that custom variable use dot (.) as splitter, but how to escape dot when reference it?

[ozbillwang]

Ok, I fixed it by myself. Escape with backslash.

${self:custom.version.v1\.0}

[ozbillwang]

Above way (escape dot) can pass cloudformation validate, but can't be deployed.

Invalid HTTP endpoint specified for URI.

If serverless print, I can't see the variable is replaced by the real value, and in updated CFN,

"${self:custom.version.v1\\.0}"

[rupakg]

Can you just use v1_0 instead of a . ?

[HyperBrain]

@ozbillwang There is currently no escape syntax for Serverless variable names, i.e. it is not possible to use dots in names for other things than separating subobjects.
Although it seems like a corner case for me, I agree that this would be an useful enhancement for these cases.

[ozbillwang]

Thanks, @rupakg @HyperBrain

At the moment, I use other characters to replace dot for these keys