Fix linting errors

src/bin/commands/account-readiness/ssm.ts

@@ -37,7 +37,7 @@ const ssmParamReadiness = async ({ credentialProvider, region }: AwsConfig): Pro
   const defaultVpcs: string[] = vpcs
     .filter((vpc) => vpc.IsDefault)
     .map((vpc) => {
-      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion -- a VPC always has an ID, the type in CDK is odd!
+      // Non-null-assertion, A VPC always has an ID, the type in CDK is odd!
       return vpc.VpcId!;
     });
 

src/bin/commands/new-project/utils/init.ts

@@ -81,7 +81,6 @@ function createPackageJson(outputDirectory: string): void {
     "ts-jest",
     "ts-node",
     "typescript",
-    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion -- deps come from `package.json`, so shouldn't be `undefined`
   ].reduce((acc, depName) => ({ ...acc, [depName]: getDevDependency(depName)! }), {});
 
   const cdkDeps: Record<string, string> = {

src/riff-raff-yaml-file/deployments/cloudformation.ts

@@ -6,13 +6,13 @@ export function cloudFormationDeployment(
   dependencies: RiffRaffDeployment[],
   contentDirectory: string,
 ): RiffRaffDeployment {
-  if (cdkStacks.length === 0) {
+  // The stacks in `cdkStacks` only differ by stage, so we can just use the first item in the list for key information.
+  const [cdkStack] = cdkStacks;
+
+  if (!cdkStack) {
     throw new Error("Unable to produce a working riff-raff.yaml file; there are no stacks!");
   }
 
-  // The stacks in `cdkStacks` only differ by stage, so we can just use the first item in the list for key information.
-  // eslint-disable-next-line @typescript-eslint/no-non-null-assertion -- length of `cdkStacks` is checked above
-  const cdkStack = cdkStacks[0]!;
   const {
     region,
     stack,

src/riff-raff-yaml-file/index.ts

@@ -222,14 +222,13 @@ export class RiffRaffYamlFile {
         Object.values(regionGroup).forEach((stageGroup) => {
           const stacks: GuStack[] = Object.values(stageGroup).flat();
 
-          if (stacks.length === 0) {
+          // The items in `stacks` only differ by stage, so we can just use the first item in the list.
+          const [stack] = stacks;
+
+          if (!stack) {
             throw new Error("Unable to produce a working riff-raff.yaml file; there are no stacks!");
           }
 
-          // The items in `stacks` only differ by stage, so we can just use the first item in the list.
-          // eslint-disable-next-line @typescript-eslint/no-non-null-assertion -- length of `stacks` is checked above
-          const stack = stacks[0]!;
-
           const lambdas = this.getLambdas(stack);
           const autoscalingGroups = this.getAutoScalingGroups(stack);