(core): CfnMapping in one stack, use value in another

[rix0rrr]

What is the problem?

CfnMapping in one stack, use value in another.

Will lead to "unknown mapping" error in 2nd stack.

[rix0rrr]

Example:

const stack1 = new Stack(app, 'Stack1');
const mapping = new CfnMapping(stack1, 'Mapping', {
  mapping: {
    'boo': { 
       'bah': 'hello'
    },
  },
});


const stack2 = new Stack(app, 'Stack2');
new CfnOutput(stack2, 'Output', {
  value: mapping.findInMap('boo', 'bah'),
});

[rix0rrr]

Current result: generates a { Fn::FindInMap } in Stack2 where the mapping does not exist.

Simplest desired result: generate the same mapping in Stack2.

[rix0rrr]

Solution: turn the result value of findInMap into a Token, that on-resolve can add a copy of itself to the consuming stack.

[github-actions]

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