estree/estree
Estree
ESTree est un schéma formel et un ensemble d'interfaces d'objets utilisés pour représenter le code source JavaScript comme un arbre de syntaxe abstraite standardisé. Il sert de format d'arbre commun et de standard de parsing pour assurer l'interopérabilité entre différents parsers JavaScript et outils de transformation.
La spécification fournit un moyen cohérent de modéliser les constructions du langage, incluant les déclarations, les expressions et les déclarations de modules. Elle inclut des représentations détaillées pour les fonctionnalités modernes du langage telles que les classes, les identifiants privés et la logique de court-circuit comme le nullish coalescing et l'optional chaining.
Le projet couvre une large surface d'outillage linguistique, incluant la modélisation de systèmes de modules avec imports dynamiques et alias d'export, la gestion des littéraux entiers larges, et le support d'extensions de syntaxe expérimentales pour les propositions de langage au stade précoce. Il définit également comment mapper les nœuds de l'arbre aux coordonnées sources originales pour un suivi précis de la localisation.
Ce modèle standardisé facilite l'analyse de code statique, la transformation automatisée de code source et l'interopérabilité générale des outils de compilation.
Features
- Standardized AST Transformation - Defines a consistent set of object interfaces to represent source code as a tree for tool interoperability.
- Abstract Syntax Tree Specifications - Defines a formal standardized structure for representing JavaScript source code syntax in a tree format.
- Standardized Schemas - Defines a consistent tree format for JavaScript source code to ensure different parsers and tools can work together.
- Standardized Representations - Provides a standardized structure for import and export declarations using named, default, and namespace specifiers.
- Modern Syntax - Represents modern constructs including classes, arrow functions, template literals, and destructuring patterns.
- Module Interface Specifications - Standardizes named imports, exports, and re-exports using literals for namespace identifiers.
- Parser Specifications - Establishes a common tree format that ensures interoperability between different JavaScript parsers and transformation tools.
- Specification AST Generation - Defines a standardized set of object interfaces for representing JavaScript source code as an abstract syntax tree.
- Interoperable Syntax Pipelines - Provides a shared specification for abstract syntax trees enabling different frontend and backend tools to exchange data.
- Syntax Tree Construction - Standardizes the construction and structure of hierarchical syntax representations from JavaScript source code.
- ESTree AST Parsing - Provides the industry-standard specification for parsing JavaScript source code into abstract syntax trees.
- Experimental Syntax Support - Provides the means to parse and analyze unstable language features and new proposals via tree extensions.
- Literal Node Representations - Maps primitive values and large integers to nodes storing both the computed value and original source text.
- Optional Chaining - Models member accesses and function calls that short-circuit when a reference is null or undefined.
- AST Node Location Mapping - Associates tree nodes with specific line and column numbers in the original code for precise error reporting.
- AST-to-Source Mappings - Provides a standard for mapping abstract syntax tree nodes back to their original source code offsets.
- Class AST Modeling - Represents class bodies including method definitions, property definitions, and static initialization blocks.
- Private Identifier Nodes - Maps private class elements and their usage in expressions to a standardized AST node format.
- Syntax Proposal Modeling - Standardizes how new JavaScript syntax proposals and experimental features are represented in a structured tree format.
- Module Export Specifications - Maps export-all declarations that rename the exported namespace using a specific alias.
- Dynamic Imports - Models dynamic import syntax by treating the module source as an arbitrary expression node.
- Module Metadata Specifications - Models module import and export declarations that specify metadata such as media types for loaded modules.
- BigInt Representations - Defines a structured node for BigInt literals that preserves both the native numeric value and the original string representation.
- Source Coordinate Mapping - Provides a structured representation of JavaScript syntax that maps source locations to specific line and column numbers.
- Standardized Tree Models - Represents code in a standardized format to facilitate automated refactoring and the generation of modified source trees.
- Null-Coalescing Operators - Defines the standardized AST node for the nullish coalescing operator.
- Operator Node Modeling - Models complex logic like optional chaining and nullish coalescing as structured AST nodes with distinct operands.
- AST Schema Extensions - Specifies standardized node additions for experimental language proposals to maintain compatibility across parser versions.
- Static Code Analysis - Models language constructs as a structured tree to enable tools that analyze code without executing it.
