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TypeScript extends static types to JavaScript and compiles the code to plain JavaScript. It performs type checks at compile time and preserves runtime behavior. It introduces static type checking, interfaces, enums, and advanced tooling while maintaining full compatibility with JavaScript runtimes. The TypeScript compiler (tsc) performs type analysis at build time, stripping type annotations and emitting runtime-safe JavaScript. TypeScript integrates with existing JavaScript toolchains and supports incremental adoption without altering runtime behavior. TypeScript’s Language Design and Integration TypeScript extends JavaScript’s syntax with static types to support type annotations on variables, functions, and objects. The compiler uses these annotations to verify type correctness before execution, reducing runtime errors. TypeScript compiles to plain JavaScript without adding runtime overhead from type annotations. Its design supports full interoperability with existing JavaScript code. Static Typing and Type Inference TypeScript’s static typing system assigns fixed types to variables, parameters, and return values. The compiler checks type compatibility during development, rejecting operations that violate type rules. Type inference automatically deduces types when no annotation exists, reducing boilerplate while preserving safety. const count: number = 5; // Explicit type const message = 'Hello'; // Inferred as `string` Explanation: number enforces numeric operations only. TypeScript infers message as string from initialization. Reassigning count to a non-number triggers a compile-time error. Enums and Interfaces Enums create named sets of constant values, and interfaces define the structure of objects with required or optional properties. TypeScript checks that objects follow these interfaces to match the expected format. enum Status { Active, Inactive } interface User { id: number; name: string; status?: Status; // Optional property } Explanation: Status members auto-increment from 0 unless overridden. User requires id and name but permits omitting status. Adding undeclared properties to a User object causes a type error. Compile-Time Safety and Structural Typing TypeScript’s compiler detects errors like wrong method calls or property access before the code runs. Its structural typing checks if types match by shape, not by inheritance, allowing duck typing. interface Point { x: number; y: number; } function logPoint(p: Point) { console.log(p.x, p.y); } logPoint({ x: 1, y: 2, z: 3 }); // Valid: extra properties allowed Explanation: TypeScript checks for x and y but ignores excess properties. Functions accepting Point also accept objects with at least x and y. Integration with JavaScript Runtimes TypeScript compiles to clean JavaScript, removing types and preserving runtime behavior. It supports modern ECMAScript features and integrates with bundlers like Webpack or esbuild. Declaration files (.d.ts) provide type hints for untyped JavaScript libraries. TypeScript in Video Workflows Video processing tools use type safety to manage streams, timelines, and metadata. TypeScript applies static types across components in media player development, timeline editors, and video metadata parsers. It reduces common bugs in asynchronous playback and rendering logic. Typed Video Metadata Handling Video players parse metadata like duration, resolution, codec, and subtitle tracks. Using TypeScript interfaces provides consistent access to these properties. interface VideoMetadata { duration: number; resolution: string; codec: string; subtitles?: string[]; } const meta: VideoMetadata = { duration: 3600, resolution: '1920x1080', codec: 'H.264' }; Explanation: The interface ensures required fields like duration exist. Optional fields like subtitles can be safely omitted. Incorrect types (e.g., codec: 264) are flagged at compile time. Frame Processing with Typing Frame-based processing needs pixel data manipulation. Type annotations prevent errors when working with binary data or Web APIs like CanvasRenderingContext2D. function processFrame(data: Uint8ClampedArray): void { for (let i = 0; i < data.length; i += 4) { data[i] = 255 - data[i]; // Red data[i + 1] = 255 - data[i+1]; // Green data[i + 2] = 255 - data[i+2]; // Blue } } Explanation: Uint8ClampedArray matches pixel buffer formats in canvas APIs. TypeScript checks that operations use valid byte indices. Out-of-bounds access is detected at compile time. Typed Event Handling in Media Players Typed event listeners improve player reliability when responding to video events like play, pause, or seek. const video = document.querySelector('video') as HTMLVideoElement; video.addEventListener('play', () => { console.log('Playback started'); }); Explanation: TypeScript infers video as HTMLVideoElement, exposing video-specific events. Handlers receive type-safe event objects. Invalid event names or properties raise compile-time errors. Typed Configurations for Video Encoders Encoder pipelines use configurations like bitrate, resolution, and frame rate. TypeScript maintains correct formats and value types in these settings. interface EncoderConfig { bitrate: number; resolution: [number, number]; framerate: number; codec: 'H.264' | 'VP9' | 'AV1'; } const config: EncoderConfig = { bitrate: 5000, resolution: [1920, 1080], framerate: 30, codec: 'AV1' }; Explanation: The union type restricts codec names to accepted values. Tuple type [number, number] enforces two resolution components. Invalid config values raise immediate type errors.
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