How to evaluate resolver changes to $context.stash?

[gxxcastillo]

Say I'm testing a resolver, createUser.vtl that modifies $context.stash.

Going off of these docs I can do the following to evaluate the result:

  const template = fs.readFileSync('./createUser.vtl', 'utf8')
  const context = fs.readFileSync('./createUserMockContext.json', 'utf8')
 
  const result = await client.evaluateMappingTemplate({ template, context }).promise()

While I see I can check result for the value that my resolver returned, how do I evaluate the changes my resolver made to $context.stash?

[gxxcastillo]

I got it working using appsync-template-tester instead of client.evaluateMappingTemplate:

import Parser from 'appsync-template-tester';

const template = fs.readFileSync('./createUser.vtl', 'utf8')
const context = fs.readFileSync('./createUserMockContext.json', 'utf8')

const parser = new Parser(template);
parser.resolve(contextMock);

With that in place, I can access the updated context and stash with parser.context and parser.stash.

[github-actions[bot]]

Hello! Reopening this discussion to make it searchable.