ByteFE
Apr 22, 2021 · Frontend Development
Understanding ECMAScript Grammars: Lexical and Syntactic Rules and the Disallowance of await as an Identifier
This article explains how the ECMAScript specification defines four context‑free grammars—lexical, syntactic, RegExp, and numeric string—illustrates ambiguities such as the '/' token and template literals, and shows how static semantics forbid using the await keyword as an identifier inside async functions while allowing it elsewhere.
ECMAScriptGrammarLexical
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