# tc39/ecma262

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15,653 stars · 1,413 forks · HTML · NOASSERTION

## Links

- GitHub: https://github.com/tc39/ecma262
- Homepage: https://tc39.es/ecma262/
- awesome-repositories: https://awesome-repositories.com/repository/tc39-ecma262.md

## Topics

`ecmascript` `javascript`

## Description

The ECMAScript specification is the formal standard defining the syntax, semantics, and execution model that all JavaScript implementations must follow. It establishes the official language rules through a combination of formal grammar and step-by-step algorithmic prose.

The project manages the technical evolution of the language via a consensus-driven governance framework and a staged proposal pipeline. This process tracks features from initial design through expert reviewer sign-off and committee approval. A specification-as-code toolchain compiles these formal definitions and algorithmic descriptions into a rendered technical document.

The specification covers core language areas including a prototype-based object model, agent-based concurrency, and asynchronous programming via event loops and promises. It further defines data representation for binary buffers, collections, and numeric computation, alongside memory management primitives and meta-programming capabilities.

## Tags

### Development Tools & Productivity

- [Formal Grammar Specifications](https://awesome-repositories.com/f/development-tools-productivity/rule-definition-languages/grammar-rule-specification/formal-grammar-specifications.md) — Defines the formal grammar and algorithmic prose that establish the language's syntax and semantics.
- [Algorithmic Prose Definitions](https://awesome-repositories.com/f/development-tools-productivity/rule-definition-languages/grammar-rule-specification/context-free-grammar-frameworks/algorithmic-prose-definitions.md) — Defines language semantics using a combination of context-free grammar and step-by-step algorithmic descriptions.
- [Documentation Build Pipelines](https://awesome-repositories.com/f/development-tools-productivity/documentation-build-pipelines.md) — Ships a toolchain to automate the generation of the specification from source files into a rendered document. ([source](https://cdn.jsdelivr.net/gh/tc39/ecma262@main/README.md))

### Programming Languages & Runtimes

- [Language Specifications](https://awesome-repositories.com/f/programming-languages-runtimes/language-specifications.md) — Provides the formal standard defining the syntax, semantics, and execution model for all JavaScript implementations.
- [Language Specifications](https://awesome-repositories.com/f/programming-languages-runtimes/language-specifications-standards/language-specifications.md) — Provides the formal documents and standards that define the syntax, behavior, and implementation of the JavaScript language. ([source](https://cdn.jsdelivr.net/gh/tc39/ecma262@main/README.md))
- [Agent-Based Concurrency Models](https://awesome-repositories.com/f/programming-languages-runtimes/agent-based-concurrency-models.md) — Defines the formal model for coordinating multiple execution contexts using shared memory and atomic operations.
- [Object Prototypes](https://awesome-repositories.com/f/programming-languages-runtimes/class-blueprint-definitions/object-prototypes.md) — Implements the core prototype-based inheritance model for object creation and shared behavior. ([source](https://tc39.es/ecma262/))
- [Generator Functions](https://awesome-repositories.com/f/programming-languages-runtimes/generator-functions.md) — Defines generator functions that can pause execution and yield values incrementally. ([source](https://tc39.es/ecma262/))
- [Language Specifications and Standards](https://awesome-repositories.com/f/programming-languages-runtimes/language-specifications-standards.md) — Provides the formal definitions and evolution roadmaps that govern the structure and maintenance of the language.
- [Numeric Computation Execution](https://awesome-repositories.com/f/programming-languages-runtimes/numeric-computation-execution.md) — Executes arithmetic and bitwise operations across different number types without implicit conversion. ([source](https://tc39.es/ecma262/))
- [Object Property Accessors](https://awesome-repositories.com/f/programming-languages-runtimes/object-property-accessors.md) — Defines the fundamental mechanisms for associating keys with data or accessors to manage object state. ([source](https://tc39.es/ecma262/))
- [Prototype-Based Inheritance](https://awesome-repositories.com/f/programming-languages-runtimes/programming-language-varieties/programming-languages/language-specific-resources/web-and-scripting-environments/prototype-based-inheritance.md) — Implements a prototype-based inheritance system where objects share behavior via a prototype chain.
- [Promise-Based Computation Management](https://awesome-repositories.com/f/programming-languages-runtimes/promise-based-computation-management.md) — Represents the eventual completion or failure of deferred operations using standard promise objects. ([source](https://tc39.es/ecma262/))
- [Proposal Lifecycles](https://awesome-repositories.com/f/programming-languages-runtimes/proposal-lifecycles.md) — Advances language features through numbered maturity stages, each requiring specific deliverables and committee consensus before progression.
- [Scheduling Loops](https://awesome-repositories.com/f/programming-languages-runtimes/runtime-execution-environments/runtime-environments/runtimes/asynchronous-execution-engines/event-driven-loops/scheduling-loops.md) — Defines the scheduling loop that enqueues and executes computations when the execution stack is empty. ([source](https://tc39.es/ecma262/))
- [Textual Data Management](https://awesome-repositories.com/f/programming-languages-runtimes/textual-data-management.md) — Defines the core mechanisms for representing and manipulating textual information via 16-bit unsigned integers. ([source](https://tc39.es/ecma262/))
- [Type Conversions](https://awesome-repositories.com/f/programming-languages-runtimes/type-conversions.md) — Defines standard operations for transforming values between boolean, number, string, and object types. ([source](https://tc39.es/ecma262/))
- [Value Identity Determination](https://awesome-repositories.com/f/programming-languages-runtimes/value-identity-determination.md) — Implements algorithms for determining value identity, handling special cases like NaN and signed zeros. ([source](https://tc39.es/ecma262/))
- [Function Context Binding](https://awesome-repositories.com/f/programming-languages-runtimes/function-context-binding.md) — Defines the mechanism for fixing the this value of a function to maintain a consistent object context. ([source](https://tc39.es/ecma262/))
- [Function Objects](https://awesome-repositories.com/f/programming-languages-runtimes/function-objects.md) — Defines callable objects that can be invoked as functions using a specified context and arguments. ([source](https://tc39.es/ecma262/))
- [Garbage Collection Callbacks](https://awesome-repositories.com/f/programming-languages-runtimes/garbage-collection-callbacks.md) — Implements a standard for associating cleanup callbacks with objects to run after they are garbage collected. ([source](https://tc39.es/ecma262/))
- [Meta-Programming Interceptors](https://awesome-repositories.com/f/programming-languages-runtimes/meta-programming-interceptors.md) — Provides a formal model for intercepting and customizing default object operations using handler objects. ([source](https://tc39.es/ecma262/))
- [Object Liveness Analysis](https://awesome-repositories.com/f/programming-languages-runtimes/object-liveness-analysis.md) — Defines the criteria for identifying if objects or symbols remain live and observable during execution. ([source](https://tc39.es/ecma262/))
- [Strict Mode Enforcement](https://awesome-repositories.com/f/programming-languages-runtimes/strict-mode-enforcement.md) — Enforces stricter parsing and error handling rules through a language-level directive to improve security. ([source](https://tc39.es/ecma262/))
- [Weak Collections](https://awesome-repositories.com/f/programming-languages-runtimes/weak-collections.md) — Defines data structures and references that allow objects to be garbage collected even when referenced. ([source](https://tc39.es/ecma262/))

### Education & Learning Resources

- [Technical Governance Frameworks](https://awesome-repositories.com/f/education-learning-resources/professional-development-career/career-development/community-operations-engagement/community-governance/technical-governance-frameworks.md) — Implements a structured process for managing technical proposals and design decisions via a committee of delegates.

### Operating Systems & Systems Programming

- [Atomic Memory Operations](https://awesome-repositories.com/f/operating-systems-systems-programming/atomic-memory-operations.md) — Provides indivisible read-modify-write operations on shared memory to synchronize state across agents. ([source](https://tc39.es/ecma262/))

### Software Engineering & Architecture

- [Committee Governance Models](https://awesome-repositories.com/f/software-engineering-architecture/committee-governance-models.md) — Provides a consensus-driven model for managing proposal ownership, reviewer sign-offs, and advancement stages.
- [Standardization Lifecycles](https://awesome-repositories.com/f/software-engineering-architecture/experimental-features/standardization-lifecycles.md) — Manages the formal lifecycle of language features from initial design to final adoption in the standard.
- [Governance Models](https://awesome-repositories.com/f/software-engineering-architecture/governance-models.md) — Establishes the consensus-driven processes and collaborative decision-making frameworks for managing the language specification.
- [Governance Proposal Lifecycles](https://awesome-repositories.com/f/software-engineering-architecture/governance-proposal-lifecycles.md) — Manages the process of determining if a proposal is ready to advance to the next maturity stage. ([source](https://tc39.es/process-document/))
- [Consensus-Based Resolution](https://awesome-repositories.com/f/software-engineering-architecture/governance-proposal-lifecycles/consensus-based-resolution.md) — Resolves specification changes and proposal transitions through delegate discussion and formal agreement in TC39 meetings.
- [Expert Reviewer Sign-offs](https://awesome-repositories.com/f/software-engineering-architecture/governance-proposal-lifecycles/expert-reviewer-sign-offs.md) — Designates independent experts to review specification text and provide sign-off before a proposal advances. ([source](https://tc39.es/process-document/))
- [Proposal Lifecycle Management](https://awesome-repositories.com/f/software-engineering-architecture/proposal-lifecycle-management.md) — Implements a structured lifecycle for tracking technical proposals from drafting through committee approval.
- [Proposal Champions](https://awesome-repositories.com/f/software-engineering-architecture/proposal-lifecycle-management/proposal-champions.md) — Assigns a designated delegate to shepherd proposals through authoring and committee presentation.
- [Unique Property Keys](https://awesome-repositories.com/f/software-engineering-architecture/reflection-based-unmarshallers/reflection-based-property-accessors/unique-property-keys.md) — Defines the creation of unique, immutable symbols to serve as non-colliding object property keys. ([source](https://tc39.es/ecma262/))
- [Documentation-as-Code Systems](https://awesome-repositories.com/f/software-engineering-architecture/documentation-as-code-systems.md) — Provides a toolchain that treats the formal specification as code, compiling it into a rendered technical document.

### Data & Databases

- [Binary Data Accessors](https://awesome-repositories.com/f/data-databases/binary-data-accessors.md) — Provides views that allow reading and writing multiple numeric types directly to an underlying binary buffer. ([source](https://tc39.es/ecma262/))
- [Collection Iteration](https://awesome-repositories.com/f/data-databases/collection-iterators/collection-iteration.md) — Defines synchronous and asynchronous interfaces for producing sequences of values from objects. ([source](https://tc39.es/ecma262/))
- [Dynamic Array Management](https://awesome-repositories.com/f/data-databases/dynamic-array-management.md) — Manages indexed collections with dynamic lengths and standard methods for sorting and transforming elements. ([source](https://tc39.es/ecma262/))
- [JSON Processing](https://awesome-repositories.com/f/data-databases/json-processing.md) — Provides built-in capabilities to convert data between standard values and JSON formatted strings. ([source](https://tc39.es/ecma262/))

### DevOps & Infrastructure

- [Specification Renderers](https://awesome-repositories.com/f/devops-infrastructure/build-toolchains/specification-renderers.md) — Implements a build pipeline that compiles formal grammar and algorithmic prose into a rendered document.