Gamma SDK Patterns

Overview

Learn idiomatic patterns and best practices for the Gamma SDK to build robust presentation automation.

Prerequisites

Completed gamma-local-dev-loop setup
Familiarity with async/await patterns
TypeScript recommended

Instructions

Step 1: Client Singleton

// lib/gamma.ts
import { GammaClient } from '@gamma/sdk';

let client: GammaClient | null = null;

export function getGammaClient(): GammaClient {
  if (!client) {
    client = new GammaClient({
      apiKey: process.env.GAMMA_API_KEY,
      timeout: 30000,  # 30000: 30 seconds in ms
      retries: 3,
    });
  }
  return client;
}

Step 2: Presentation Builder

// lib/presentation-builder.ts
import { getGammaClient } from './gamma';

interface SlideContent {
  title: string;
  content: string;
  layout?: 'title' | 'content' | 'image' | 'split';
}

export class PresentationBuilder {
  private slides: SlideContent[] = [];
  private title: string = '';
  private style: string = 'professional';

  setTitle(title: string): this {
    this.title = title;
    return this;
  }

  addSlide(slide: SlideContent): this {
    this.slides.push(slide);
    return this;
  }

  setStyle(style: string): this {
    this.style = style;
    return this;
  }

  async build() {
    const gamma = getGammaClient();
    return gamma.presentations.create({
      title: this.title,
      slides: this.slides,
      style: this.style,
    });
  }
}

Step 3: Error Handling Wrapper

// lib/safe-gamma.ts
import { GammaError } from '@gamma/sdk';

export async function safeGammaCall<T>(
  fn: () => Promise<T>
): Promise<{ data: T; error: null } | { data: null; error: string }> {
  try {
    const data = await fn();
    return { data, error: null };
  } catch (err) {
    if (err instanceof GammaError) {
      return { data: null, error: err.message };
    }
    throw err;
  }
}

Step 4: Template Factory

// lib/templates.ts
type TemplateType = 'pitch-deck' | 'report' | 'tutorial' | 'proposal';

const TEMPLATES: Record<TemplateType, object> = {
  'pitch-deck': { slides: 10, style: 'bold' },
  'report': { slides: 15, style: 'professional' },
  'tutorial': { slides: 8, style: 'friendly' },
  'proposal': { slides: 12, style: 'corporate' },
};

export function fromTemplate(type: TemplateType, title: string) {
  return { ...TEMPLATES[type], title };
}

Output

Reusable client singleton
Fluent builder pattern
Type-safe error handling
Template factory system

Error Handling

Pattern	Use Case	Benefit
Singleton	Multiple modules	Consistent config
Builder	Complex presentations	Readable code
Safe Call	Error boundaries	Graceful failures
Factory	Repeated templates	DRY code

Resources

Next Steps

Proceed to gamma-core-workflow-a for presentation generation workflows.

Examples

Basic usage: Apply gamma sdk patterns to a standard project setup with default configuration options.

Advanced scenario: Customize gamma sdk patterns for production environments with multiple constraints and team-specific requirements.

gamma-sdk-patterns