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Learning TypeScript 2.x - Second Edition
book

Learning TypeScript 2.x - Second Edition

by Remo H. Jansen
April 2018
Beginner content levelBeginner
536 pages
13h 21m
English
Packt Publishing
Content preview from Learning TypeScript 2.x - Second Edition

Symbols

The TypeScript textbook by Basarat Ali Syed describes symbols as follows:

"Symbols connect declaration nodes in the AST to other declarations contributing to the same entity. Symbols are the basic building block of the Semantic system."

The symbol class is defined in the TypeScript source code as follows:

function Symbol(this: Symbol, flags: SymbolFlags, name: __String) { 
    this.flags = flags; 
    this.escapedName = name; 
    this.declarations = undefined; 
    this.valueDeclaration = undefined; 
    this.id = undefined; 
    this.mergeId = undefined; 
    this.parent = undefined; }

A symbol contains a reference to the declarations of a type and some flags that help us to identify some of its characteristics.

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Publisher Resources

ISBN: 9781788391474Supplemental Content