Closure Compiler + Closure Library usage

[Andriy Romanov]

Trying to compile a.js file that has one goog.require('goog.string') and use google closure library. I am probably missing something simple. Here is output I am getting:

aromanov@Thinkpad:~/src/js/closure/first$ java -jar ~/Downloads/compiler-latest/closure-compiler-v20180610.jar --js ../closure-library/closure/goog/ --js a.js

../closure-library/closure/goog/base_module_test.js:145: WARNING - The body of an ES6 module cannot reference this.

      this)

      ^^^^

../closure-library/closure/goog/testing/testrunner_test.js:25: ERROR - Illegal redeclared variable: testCase

let testCase;

    ^^^^^^^^

1 error(s), 1 warning(s)

Are there some additional options that I need to specify? What is the conventional usage of closure compiler with closure library?

[ghosttie]

I think you're going to need to post more of your code

[Chad Killingsworth]

Including closure-compiler is kinda a pain. To use globs, you end up excluding a lot of things. However for simple things, you can just include all the needed files (order matters if you don't use the dependency management flags):

java -jar compiler.jar --js ../closure-library/closure/goog/base.js --js  ../closure-library/closure/goog/string/string.js --js=a.js

You definitely don't want to include any file that ends with `_test.js`.

Chad Killingsworth

[Andriy Romanov]

Here is code from a.js:

goog.require('goog.string')

var someFunction = function() {

  if (goog.string.startsWith('abcd', 'ab')) {

    console.log('It definitely starts')

  }

  return 1+1

}

console.log(someFunction())

Super generic code that just does goog.require. Generally speaking following works:

java -jar ~/Downloads/compiler-latest/closure-compiler-v20180610.jar --js ../closure-library/closure/goog/string/string.js --js a.js

But it kind of defeats the purpose of dependency management. I would love not hvae to manually find all the dependencies and include them.

[Chad Killingsworth]

Then your compile command is going to look something like:

java -jar compiler.jar \
  --dependency_mode STRICT \
  --entry_point ./a.js \
  --js `../closure-library/closure/**.js' \

    --js '../closure-library/third_party/**.js' \

    --js '!../closure-library/**test.js', \

    --js '!../closure-library/**tester.js' \

    --js `!../closure-library/**_perf.js' \

    --js '!../closure-library/closure/goog/bootstrap/nodejs.js' \

    --js '!../closure-library/closure/goog/bootstrap/bytestring_perf.js' \
    --js a.js

[Andriy Romanov]

That worked. Thank you