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**Project structure:**

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**ESC environment definition (YAML):**
```yaml
values:
  # Static configuration
  pulumiConfig:
    aws:region: us-west-2
    myapp:instanceType: t3.medium

  # Dynamic OIDC credentials for AWS
  aws:
    login:
      fn::open::aws-login:
        oidc:
          roleArn: arn:aws:iam::123456789:role/pulumi-oidc
          sessionName: pulumi-deploy

  # Pull secrets from AWS Secrets Manager
  secrets:
    fn::open::aws-secrets:
      region: us-west-2
      login: ${aws.login}
      get:
        dbPassword:
          secretId: prod/database/password

  # Expose to environment variables
  environmentVariables:
    AWS_ACCESS_KEY_ID: ${aws.login.accessKeyId}
    AWS_SECRET_ACCESS_KEY: ${aws.login.secretAccessKey}
    AWS_SESSION_TOKEN: ${aws.login.sessionToken}

import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";

// Get configuration from ESC
const config = new pulumi.Config();
const instanceType = config.require("instanceType");

// Create resources with proper tagging
const bucket = new aws.s3.Bucket("my-bucket", {
    versioning: { enabled: true },
    serverSideEncryptionConfiguration: {
        rule: {
            applyServerSideEncryptionByDefault: {
                sseAlgorithm: "AES256",
            },
        },
    },
    tags: {
        Environment: pulumi.getStack(),
        ManagedBy: "Pulumi",
    },
});

// Export outputs
export const bucketName = bucket.id;
export const bucketArn = bucket.arn;

import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";

interface WebServiceArgs {
    port: pulumi.Input<number>;
    imageUri: pulumi.Input<string>;
}

class WebService extends pulumi.ComponentResource {
    public readonly url: pulumi.Output<string>;

    constructor(name: string, args: WebServiceArgs, opts?: pulumi.ComponentResourceOptions) {
        super("custom:app:WebService", name, {}, opts);

        // Create child resources with { parent: this }
        const lb = new aws.lb.LoadBalancer(`${name}-lb`, {
            loadBalancerType: "application",
            // ... configuration
        }, { parent: this });

        this.url = lb.dnsName;
        this.registerOutputs({ url: this.url });
    }
}

import * as pulumi from "@pulumi/pulumi";

// Reference outputs from networking stack
const networkingStack = new pulumi.StackReference("myorg/networking/prod");
const vpcId = networkingStack.getOutput("vpcId");
const subnetIds = networkingStack.getOutput("privateSubnetIds");

import * as pulumi from "@pulumi/pulumi";

// Use apply for transformations
const uppercaseName = bucket.id.apply(id => id.toUpperCase());

// Use pulumi.all for multiple outputs
const combined = pulumi.all([bucket.id, bucket.arn]).apply(
    ([id, arn]) => `Bucket ${id} has ARN ${arn}`
);

// Conditional resources
const isProd = pulumi.getStack() === "prod";
const monitoring = isProd ? new aws.cloudwatch.MetricAlarm("alarm", {
    // ... configuration
}) : undefined;

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// Export async function for top-level await
export = async () => {
    const data = await fetchExternalData();

    const resource = new aws.s3.Bucket("bucket", {
        tags: { data: data.value },
    });

    return {
        bucketName: resource.id,
    };
};

my-component/
├── PulumiPlugin.yaml      # Required for multi-language
├── package.json
├── tsconfig.json
└── index.ts               # Component definition

runtime: nodejs

import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";

// Args interface - use Input types for all properties
export interface SecureBucketArgs {
    // Wrap all scalar members in Input types
    bucketName: pulumi.Input<string>;
    enableVersioning?: pulumi.Input<boolean>;
    tags?: pulumi.Input<Record<string, pulumi.Input<string>>>;
}

export class SecureBucket extends pulumi.ComponentResource {
    public readonly bucketId: pulumi.Output<string>;
    public readonly bucketArn: pulumi.Output<string>;

    // Constructor must have 'args' parameter with type annotation
    constructor(name: string, args: SecureBucketArgs, opts?: pulumi.ComponentResourceOptions) {
        super("myorg:storage:SecureBucket", name, {}, opts);

        const bucket = new aws.s3.Bucket(`${name}-bucket`, {
            bucket: args.bucketName,
            versioning: { enabled: args.enableVersioning ?? true },
            serverSideEncryptionConfiguration: {
                rule: {
                    applyServerSideEncryptionByDefault: {
                        sseAlgorithm: "AES256",
                    },
                },
            },
            tags: args.tags,
        }, { parent: this });

        this.bucketId = bucket.id;
        this.bucketArn = bucket.arn;

        this.registerOutputs({
            bucketId: this.bucketId,
            bucketArn: this.bucketArn,
        });
    }
}

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**Multi-language Args requirements:**
- Use `pulumi.Input<T>` for all scalar properties
- Avoid union types (`string | number`) - not supported
- Avoid functions/callbacks - not serializable
- Constructor must have `args` parameter with type declaration

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