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@fluidframework/synthesize

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@fluidframework/synthesize

An Ioc type library for synthesizing a FluidObject based on FluidObject providers.

Using Fluid Framework libraries

For a dependency on a Fluid Framework library's public APIs, we recommend a ^ (caret) version range. For example, use ^1.3.4.

For a dependency on an unstable API, such as a beta API, we recommend a more restrictive version range. For example, use a ~ version range.

Installation

Run this command to install the package:

npm i @fluidframework/synthesize

Importing from this package

This package uses package.json exports to separate APIs by support level. For information about the support guarantees, read API Support Levels.

Import the public APIs from @fluidframework/synthesize.

Import the legacy APIs from @fluidframework/synthesize/legacy.

API Documentation

Read the @fluidframework/synthesize API documentation at https://fluidframework.com/docs/apis/synthesize.

It allows for the creation of a DependencyContainer that can have FluidObjects registered with it based on their interface Symbol. So for example if I wanted to register something as IFoo I would need to provide and object that implements IFoo along side it.

The DependencyContainer also exposes a synthesize method that returns an object with a Promise to the correct optional and required symbols requested.

So if I wanted an object with an optional IFoo and a required IBar I would get back:

{
	IFoo: Promise<IFoo | undefined>;
	IBar: Promise<IBar>;
}

Simple Example

const dc = new DependencyContainer<FluidObject<IFoo & IBar>>();
dc.register(IFoo, new Foo());

const s = dc.synthesize({IFoo}, {});
const foo = await s.IFoo;
console.log(s.IFoo?.foo;)

API

Fluid object Providers

Fluid object Providers are the the different ways you can return a FluidObject when registering.

There are four types of providers:

  1. Value Provider
  2. Async Value Provider
  3. Factory Provider
  4. Async Factory Provider
type FluidObjectProvider<T> =
	| NonNullable<T>
	| Promise<NonNullable<T>>
	| ((dependencyContainer: IFluidDependencySynthesizer) => NonNullable<T>)
	| ((dependencyContainer: IFluidDependencySynthesizer) => Promise<NonNullable<T>>);

Value Provider

Provide an FluidObject of a given type.

Usage
const dc = new DependencyContainer<FluidObject<IFoo>>();

dc.register(IFoo, new Foo());
Async Value Provider

Provide a Promise to an FluidObject of a given type.

Usage
const dc = new DependencyContainer<FluidObject<IFoo>>();

const generateFoo: Promise<IFoo> = await() => {
    const foo = new Foo();
    await foo.initialize();
    return foo;
}

dc.register(IFoo, generateFoo());
Factory Provider

Provide a function that will resolve an FluidObject of a given type.

Usage
const dc = new DependencyContainer<FluidObject<IFoo & IBar>>();
const fooFactory = () => new Foo();
dc.register(IFoo, fooFactory);

// Factories can utilize the DependencyContainer if the FluidObject depends
// on other providers
const barFactory = (dc) => new Bar(dc);
dc.register(IFoo, barFactory);
Async Factory Provider

Provide a function that will resolve a Promise to an FluidObject of a given type.

Usage
const dc = new DependencyContainer<FluidObject<IFoo & IBar>>();

const generateFoo: Promise<IFoo> = await() => {
    const foo = new Foo();
    await foo.initialize();
    return foo;
}

dc.register(IFoo, generateFoo);

const generateBar: Promise<IBar> = await(dc) => {
    const bar = new Bar();
    await bar.initialize(dc);
    return bar;
}

dc.register(IBar, generateBar);

Synthesize

Once you have a DependencyContainer with registered providers you can synthesize/generate a new FluidObject from it. The object that is returned will have the correct typing of optional and required types.

An Example:

If I wanted an object with an optional IFoo and a required IBar I would get back:

{
	IFoo: Promise<IFoo | undefined>;
	IBar: Promise<IBar>;
}

synthesize takes optionalTypes and requiredTypes as well as their corresponding types. FluidObjectSymbolProvider<> is a TypeScript type that ensures the types being passed match the ones in the object being provided.

Optional Types

Optional types will return a Promise to it's corresponding FluidObject or undefined. Because of this we need to do an if check to validate the object or use the ? like in the example below.

const dc = new DependencyContainer<FluidObject<IFoo>>();

const s = dc.synthesize<IFoo>({ IFoo }, {});
const foo = await s.IFoo;
console.log(foo?.foo);

Note: Because of how generics in TypeScript work we need to provide an empty requiredTypes object even though we don't need to provide the type.

Required Types

Required types will return a Promise to it's corresponding FluidObject or it will throw.

You can see below that we don't need to add the ? to check our requested type.

const dc = new DependencyContainer<FluidObject<IFoo>>();

const scope = dc.synthesize<{}, IFoo>({}, { IFoo });
const foo = await s.IFoo;
console.log(foo.foo);
Multiple Types

You can declare multiple types for both Optional and Required using the & or creating a separate type.

const dc = new DependencyContainer<FluidObject<IFoo & IBar>>();

const scope = dc.synthesize<IFoo & IBar>({ IFoo, IBar }, {});
const fooP = s.IFoo;
const barP = s.IBar;
const [foo, bar] = Promise.all([foo, bar]);
console.log(foo?.foo);
console.log(bar?.bar);
const dc = new DependencyContainer<FluidObject<IFoo & IBar>>();

const scope = dc.synthesize<{}, IFoo & IBar>({}, { IFoo, IBar });
const fooP = s.IFoo;
const barP = s.IBar;
const [foo, bar] = Promise.all([foo, bar]);
console.log(foo.foo);
console.log(bar.bar);
const dc = new DependencyContainer<FluidObject<IFoo & IBar>>();

const scope = dc.synthesize<IFoo, IBar>({ IFoo }, { IBar });
const fooP = s.IFoo;
const barP = s.IBar;
const [foo, bar] = Promise.all([foo, bar]);
console.log(foo?.foo);
console.log(bar.bar);

Parent

The DependencyContainer takes one optional parameter which is the parent. When resolving providers the DependencyContainer will first check the current container then look in the parent.

Minimum Client Requirements

Fluid Framework client libraries support the platforms in this document. These requirements are intentionally restrictive. Within a major version series, we can relax these requirements, but we cannot make them stricter. For a Long Term Support (LTS) version, we might need to support these platforms for several years.

Other configurations can work, but Fluid Framework does not support them. If an unsupported configuration stops working, we do not classify this as a bug. To request support for a configuration that is not listed, file an issue. The product team will evaluate your request. In the issue, specify the current status of the configuration:

  • The configuration works but needs official support.
  • The configuration does not work and requires changes.
Supported Runtimes
  • Fluid Framework supports Node.js versions 22 and 24 while they receive upstream support.
  • Fluid Framework supports modern browsers that support the ES2022 standard library.
Supported Tools
  • TypeScript 6.0:
    • Fluid Framework supports all strict options.
    • Set the build targets (lib, target) to ES2022 or later.
    • Enable strictNullChecks.
    • Fluid Framework does not support configuration options deprecated in TypeScript 6.0.
    • Fluid Framework does not fully support exactOptionalPropertyTypes. If you enable this option, do not use in, Reflect.has, Object.hasOwn, or Object.prototype.hasOwnProperty to narrow members of Fluid Framework types. These methods can incorrectly exclude undefined from the possible values.
  • webpack 5
    • We do not require a specific bundler. Other bundlers that handle ES Modules can work, but we actively test only webpack.
Module Resolution

In TypeScript compilerOptions, use Node16, Node20, NodeNext, or Bundler module resolution. These settings follow the Node.js v12+ ESM Resolution and Loading algorithm.

Do not use Node10 module resolution.

Module Formats
  • ES Modules: Use ES Modules to consume Fluid Framework client packages, including in Node.js.
  • CommonJS: Fluid Framework does not officially support CommonJS in version 3.0 or later.

Contribution Guidelines

You can contribute to Fluid Framework in these ways:

For detailed instructions, read the repo documentation.

This project follows the Microsoft Open Source Code of Conduct. For more information, read the Code of Conduct frequently asked questions. For questions or comments, contact opencode@microsoft.com.

This project may contain Microsoft trademarks or logos for Microsoft projects, products, or services. Use of these trademarks or logos must follow Microsoft’s Trademark & Brand Guidelines. Use of Microsoft trademarks or logos in modified versions of this project must not cause confusion or imply Microsoft sponsorship.

Help

Read the Fluid Framework documentation for information about Fluid Framework concepts and APIs.

To request information that the documentation does not contain, create an issue.

Trademark

This project may contain Microsoft trademarks or logos for Microsoft projects, products, or services.

Use of these trademarks or logos must follow Microsoft's Trademark & Brand Guidelines.

Use of Microsoft trademarks or logos in modified versions of this project must not cause confusion or imply Microsoft sponsorship.