HowTo: Compile app with Closure Compiler
lazarus / 76-Pas2JS

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ps · 2020-07-04 11:51

"The Closure Compiler is a tool for making JavaScript download and run
faster. Instead of compiling from a source language to machine code,
it compiles from JavaScript to better JavaScript. It parses your
JavaScript, analyzes it, removes dead code and rewrites and minimizes
what's left. It also checks syntax, variable references, and types,
and warns about common JavaScript pitfalls."

https://developers.google.com/closure/compiler

We need little modification to our compiled javascript file .

1. Add window['rtl'] = rtl; to end of our compiled JS file
2. Create externs.js file

On Windows:

FILE: closure-footer.js
Code: Text  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
  window['rtl'] = rtl;
FILE: externs.js
Code: Javascript  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i /**
@interface */function ControlsAndConstants() {}/** @type {number}
*/ControlsAndConstants.prototype.run; FILE: compile.bat
Code: Text  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i type
closure-footer.js >> app.jsjava -jar closure-compiler-v20200517.jar
--compilation_level SIMPLE --js app.js --js_output_file app-min.js
Note: Compilation level ADVANCED is not supported.

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d-_-b · 2020-07-28 22:37

QuoteNote: Compilation level ADVANCED is not supported.
Which is sad because it the best compiler/transpiler for js out there,
used by other languages like clojurescript.

Thanks for testing it with SIMPLE, baby steps, before one run, i
believe.

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lainz · 2020-07-28 23:53

Remember that these compilers are not perfect, I usually get
JavaScript broken with these tools, so try it with care.

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ps · 2020-07-30 19:00

Closure Compiler is amazing (esp. with ADVANCED), but there is
problem. See this: https://bugs.freepascal.org/view.php?id=37114

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lainz · 2020-07-31 22:06

Yes, it's good. But anyways remember testing everything once
compiled... things may fail.