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# typescript
s
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l
var bar = new pulumi.Config("foo").require("bar");
Unless "foo" is the name of the project, in which case, you would omit the parameter to 
new Config()
.
r
its actually this i was trying to generalize
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config:
  aws:region: us-west-2
so i was trying to create a resource which is region specific so instead of hardcoding i am trying to use the region var
r
tenwit has the correct pattern there though, so following that and replacing 
foo
with 
aws
and 
bar
with 
region
gets you what you want.
l
The aws provider should grab that config without you needing to worry about it though. The 
aws:region
config value is used automatically.
r
I tried to add new variable in pulumi.dev.yaml
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config:
  aws:region: us-west-2
  ecr:env: dev
when i try to access it throws error
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var env = new pulumi.Config("ecr").require("env");
const ecr = ecr("registry/${env}/alpine");
expecting
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const ecr = ecr("registry/dev/alpine");
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error: 1 error occurred:
        * error creating ECR repository: InvalidParameterException: Invalid parameter at 'repositoryName' failed to satisfy constraint: 'must satisfy regular expression '(?:[a-z0-9]+(?:[._-][a-z0-9]+)*/)*[a-z0-9]+(?:[._-][a-z0-9]+)*''
oh so this works as expected
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`registry/${env}/alpine`
what is the difference between " and ` ?
r
https://basarat.gitbook.io/typescript/future-javascript/template-strings (This is how strings are interpolated in typescript)
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