The Babel parser generates AST according to Babel AST format. It is based on ESTree spec with some deviations.
2. 本期涉及哪些 AST node types？
本期涉及：
- Template Literals
- TemplateLiteral
- TaggedTemplateExpression
- TemplateElement
- Patterns
- ObjectPattern
- ArrayPattern
- RestElement
- AssignmentPattern
3. 语法规范回顾
3.1. Template Literals
3.1.1. ES6 语法定义
3.1.2. AST Node
代码语言：javascript复制export interface TaggedTemplateExpression extends BaseNode {
type: "TaggedTemplateExpression";
tag: Expression;
quasi: TemplateLiteral;
typeParameters: TypeParameterInstantiation | TSTypeParameterInstantiation | null;
}
export interface TemplateElement extends BaseNode {
type: "TemplateElement";
value: { raw: string, cooked?: string };
tail: boolean;
}
export interface TemplateLiteral extends BaseNode {
type: "TemplateLiteral";
quasis: Array<TemplateElement>;
expressions: Array<Expression>;
}3.1.3. 示例1：
示例：
代码语言：javascript复制`string text`AST：
3.1.4. 示例2：
示例：
代码语言：javascript复制`string text ${expression} string text`AST：
3.1.5. 示例3：
示例：
代码语言：javascript复制tag `string text ${expression} string text`
AST：
3.2. Destructuring Binding Patterns
3.2.1. ES6 语法定义
3.2.2. AST Node
代码语言：javascript复制export type Pattern = AssignmentPattern | ArrayPattern | ObjectPattern;
export interface AssignmentPattern extends BaseNode {
type: "AssignmentPattern";
left: Identifier | ObjectPattern | ArrayPattern | MemberExpression;
right: Expression;
decorators: Array<Decorator> | null;
typeAnnotation: TypeAnnotation | TSTypeAnnotation | Noop | null;
}
export interface ArrayPattern extends BaseNode {
type: "ArrayPattern";
elements: Array<null | PatternLike>;
decorators: Array<Decorator> | null;
typeAnnotation: TypeAnnotation | TSTypeAnnotation | Noop | null;
}
export interface ObjectPattern extends BaseNode {
type: "ObjectPattern";
properties: Array<RestElement | ObjectProperty>;
decorators: Array<Decorator> | null;
typeAnnotation: TypeAnnotation | TSTypeAnnotation | Noop | null;
}
3.2.3. 示例1：
示例：
代码语言：javascript复制const {x, y, ...z} = o;AST：
3.2.4. 示例2：
示例：
代码语言：javascript复制const [x, y, ...z] = o;AST：
3.2.5. 示例3：
示例：
代码语言：javascript复制function add(v1=1, v2=2){}
AST：
参考资料：Modules
template-literals： http://www.ecma-international.org/ecma-262/6.0/index.html#sec-template-literal-lexical-components https://github.com/babel/babel/blob/master/packages/babel-parser/ast/spec.md#template-literals
