public overrideDiffResourceChangeImpactWithChangeSetChangeImpact()

in packages/@aws-cdk/cloudformation-diff/lib/diff/template-and-changeset-diff-merger.ts [95:135]
36 lines of code
11 McCabe index (conditional complexity)

  public overrideDiffResourceChangeImpactWithChangeSetChangeImpact(logicalId: string, change: types.ResourceDifference) {
    // resourceType getter throws an error if resourceTypeChanged
    if ((change.resourceTypeChanged === true) || change.resourceType?.includes('AWS::Serverless')) {
      // CFN applies the SAM transform before creating the changeset, so the changeset contains no information about SAM resources
      return;
    }
    change.forEachDifference((type: 'Property' | 'Other', name: string, value: types.Difference<any> | types.PropertyDifference<any>) => {
      if (type === 'Property') {
        if (!this.changeSetResources[logicalId]) {
          (value as types.PropertyDifference<any>).changeImpact = types.ResourceImpact.NO_CHANGE;
          (value as types.PropertyDifference<any>).isDifferent = false;
          return;
        }

        const changingPropertyCausesResourceReplacement = (this.changeSetResources[logicalId].propertyReplacementModes ?? {})[name]?.replacementMode;
        switch (changingPropertyCausesResourceReplacement) {
          case 'Always':
            (value as types.PropertyDifference<any>).changeImpact = types.ResourceImpact.WILL_REPLACE;
            break;
          case 'Never':
            (value as types.PropertyDifference<any>).changeImpact = types.ResourceImpact.WILL_UPDATE;
            break;
          case 'Conditionally':
            (value as types.PropertyDifference<any>).changeImpact = types.ResourceImpact.MAY_REPLACE;
            break;
          case undefined:
            (value as types.PropertyDifference<any>).changeImpact = types.ResourceImpact.NO_CHANGE;
            (value as types.PropertyDifference<any>).isDifferent = false;
            break;
          // otherwise, defer to the changeImpact from the template diff
        }
      } else if (type === 'Other') {
        switch (name) {
          case 'Metadata':
            // we want to ignore metadata changes in the diff, so compare newValue against newValue.
            change.setOtherChange('Metadata', new types.Difference<string>(value.newValue, value.newValue));
            break;
        }
      }
    });
  }