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In 2001 Douglas Crockford introduced JSMin, [1] which removed comments and whitespace from JavaScript code. [2] It was followed by YUI Compressor in 2007. [2] In 2009, Google opened up its Closure toolkit, including Closure Compiler which contained a source mapping feature together with a Firefox extension called Closure Inspector. [3]
There are two types of compression that can be applied to JavaScript scripts: Reduce the redundancy in the script (by removing comments, white space and shorten variable and functions names). This does not alter the behavior of the script. Compress the original script and create a new script that contains decompression code and compressed data.
The Amsterdam Compiler Kit (ACK) is a retargetable compiler suite and toolchain written by Andrew Tanenbaum and Ceriel Jacobs, since 2005 maintained by David Given. [1] It has frontends for the following programming languages : C , Pascal , Modula-2 , Occam , and BASIC .
Emscripten allows applications and libraries written in C or C++ to be compiled ahead of time and run efficiently in web browsers, typically at speeds comparable to or faster than interpreted or dynamically compiled JavaScript. It even emulates an entire POSIX operating system, enabling programmers to use functions from the C standard library ...
Bun is a JavaScript runtime, package manager, test runner and bundler built from scratch using the Zig programming language. [4] [5] It was designed by Jarred Sumner as a drop-in replacement for Node.js. Bun uses WebKit's JavaScriptCore as the JavaScript engine, [6] unlike Node.js and Deno, which both use V8.
Conversely, some language features make certain optimizations easier. For example, in some languages, functions are not permitted to have side effects. Therefore, if a program makes several calls to the same function with the same arguments, the compiler can infer that the function's result only needs to be computed once.
The Closure Compiler is a tool that attempts to compress and optimize JavaScript code, at the expense of human readability. Unlike an actual compiler, it does not compile from JavaScript to machine code but rather minifies JavaScript. The process executes the following steps: Parses the submitted JavaScript; Analyzes the JavaScript; Removes any ...
Function declarations, which declare a variable and assign a function to it, are similar to variable statements, but in addition to hoisting the declaration, they also hoist the assignment – as if the entire statement appeared at the top of the containing function – and thus forward reference is also possible: the location of a function ...