cdktf: Synth ignore code changes and generate with old values

[djakielski]

Expected Behavior

I had an Lambda function from a generated module (https://github.com/cloudposse/terraform-aws-lambda-function) and change name of handler attribute from mail.handler to index.handler. I also add a Policy attachment. So it should change the handler property and create new policy.

import {Construct} from 'constructs';
import {LambdaFunction} from '../.gen/modules/lambda-function';
import {AssetType, Fn, TerraformAsset} from 'cdktf';
import * as path from 'node:path';
import {DataAwsIamPolicyDocument} from '@cdktf/provider-aws/lib/data-aws-iam-policy-document';
import {IamPolicy} from '@cdktf/provider-aws/lib/iam-policy';

export interface EmailExtractorConfig {
    readonly extractedBucketPath: string;
    readonly inboundBucketPath: string;
    readonly functionArtifactPath: string;
}

export class EmailExtractor extends Construct {
    private readonly lambdaFunction: LambdaFunction;

    constructor(scope: Construct, id: string, config : EmailExtractorConfig) {
        super(scope, id);
        const policy = new IamPolicy(this, `${id}-policy`, {
            name: "email-extractor",
            policy: new DataAwsIamPolicyDocument(this, `${id}-policy-document`, {
                statement: [{
                    effect: 'Allow',
                    actions: ['s3:GetObject'],
                    resources: [`arn:aws:s3:::${Fn.replace(config.inboundBucketPath, "s3://", "")}`],
                },{
                    effect: 'Allow',
                    actions: ['s3:PutObject'],
                    resources: [`arn:aws:s3:::${Fn.replace(config.extractedBucketPath, "s3://", "")}`],
                }]
            }).json
        })
        this.lambdaFunction = new LambdaFunction(this, "function", {
            functionName: 'email-extractor',
            roleName: 'email-extractor',
            runtime: 'nodejs20.x',
            handler: 'index.handler',
            filename: new TerraformAsset(this, 'lambda-asset', {
                type: AssetType.ARCHIVE,
                path: path.resolve(config.functionArtifactPath),
            }).path,
            ephemeralStorageSize: 1024,
            memorySize: 1024,
            publish: true,
            tracingConfigMode: 'Active',
            lambdaEnvironment: {
                variables: {
                    INBOUND_BUCKET_PATH: config.inboundBucketPath,
                    EXTRACTED_BUCKET_PATH: config.extractedBucketPath,
                }
            },
            customIamPolicyArns: [policy.arn]
        })

    }

    getLambdaArn() : string {
        return this.lambdaFunction.arnOutput;
    }
}

Actual Behavior

No changes detected

When i run cdktf deploy or cdktf synth in cdk.tf.json will sill be the old value "mail.handler". Also when I delete cdktf.out folder. I had no idea where the old value comes from. Maybe from remote backend?

Changes on Environment Variables are detected and will deployed.

...
"module": {
    "order-reader-email-extractor_function_DBF17BD2": {
      "//": {
        "metadata": {
          "path": "order-reader/order-reader-email-extractor/function",
          "uniqueId": "order-reader-email-extractor_function_DBF17BD2"
        }
      },
      "ephemeral_storage_size": 1024,
      "filename": "assets/order-reader-email-extractor_lambda-asset_7DBD78E7/9D1305C6223E9D0C404D6FA27DFDF87F/archive.zip",
      "function_name": "email-extractor",
      "handler": "mail.handler",
      "lambda_environment": {
        "variables": {
          "EXTRACTED_BUCKET_PATH": "s3://${aws_s3_bucket.order-reader-inbound-mail_E8ABD570.bucket}/extracted2",
          "INBOUND_BUCKET_PATH": "inbound-orders"
        }
      },
      "memory_size": 1024,
      "publish": true,
      "role_name": "email-extractor",
      "runtime": "nodejs20.x",
      "source": "cloudposse/lambda-function/aws",
      "tracing_config_mode": "Active",
      "version": "~> 0.6"
    },
...

Steps to Reproduce

1. Deploy Lambda with cdktf
2. Change handler name
3. Deploy again

Versions

language: typescript
cdktf-cli: 0.20.8
node: v20.15.1
cdktf: 0.20.8
constructs: 10.3.0
jsii: null
terraform: 1.7.2
arch: arm64
os: darwin 23.6.0
providers
sveba/netcupdns@~> 1.2 (LOCAL)
terraform provider version: 1.2.0
@cdktf/provider-aws (PREBUILT)
terraform provider version: 5.65.0
prebuilt provider version: 19.33.0
cdktf version: ^0.20.0

Providers

┌─────────────────┬──────────────────┬─────────┬────────────┬─────────────────────┬─────────────────┐
│ Provider Name │ Provider Version │ CDKTF │ Constraint │ Package Name │ Package Version │
├─────────────────┼──────────────────┼─────────┼────────────┼─────────────────────┼─────────────────┤
│ sveba/netcupdns │ 1.2.0 │ │ ~> 1.2 │ │ │
├─────────────────┼──────────────────┼─────────┼────────────┼─────────────────────┼─────────────────┤
│ aws │ 5.65.0 │ ^0.20.0 │ │ @cdktf/provider-aws │ 19.33.0 │
└─────────────────┴──────────────────┴─────────┴────────────┴─────────────────────┴─────────────────┘

Gist

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Possible Solutions

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Workarounds

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Anything Else?

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References

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Help Wanted

• I'm interested in contributing a fix myself

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