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The performance of applications on the web platform is becoming increasingly bottlenecked by the startup (load) time. Large amounts of JavaScript code are required to create rich web experiences that we’ve become used to. When we look at the total size of JavaScript requested on mobile devices from HTTPArchive, we see that an average page loads 350KB of JavaScript, while 10% of pages go over the 1
This document defines an interface for an abstract syntax tree that can be used to represent the structure of an ECMAScript program. The interface is intended to be able to represent any structurally valid ECMAScript program (according to the latest version of ECMA-262) while minimising the number of invalid programs that may be represented. This specification is defined using the Web IDL standard
README.md Note: All source code in this repository is under the Unlicense. Proposal for SpiderMonkey AST representation for import and export statements The current AST format is both inconsistent and complicated. Esprima and Acorn have two different syntax trees for the same thing, and that currently heavily hinders inter-op between the two. Since the module syntax is stabilized, but I can tell t
There's been some recent talk on es-discuss about standardizing source maps in ECMAScript 7. Before that happens, we should take a moment to reflect on what source maps have done well, where they are lacking, and meditate on what a more perfect debug format for compilers targeting JavaScript might be. My response quickly outgrew an email reply, and so I am collecting my thoughts and posting them h
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