Bundle size optimisation based on NYC

[davidyuk]

As a workaround to #6 I'm proposing to use a code coverage tool to detect unused functions in the bundle and remove them later. I've managed to reduce minified bundle size from 6.95mb to 2.15mb keeping the required functionality.

related to aeternity/aepp-sdk-js#1117 aeternity/aepp-sdk-js#1693

This PR is supported by the Æternity Crypto Foundation

$ ./optimise.sh 
+ mkdir -p temp
+ sed 's/\t/  /g' ../dist/bundle.js
+ node ./src/test.js
Looks ok
+ npx webpack
asset output.js 6.95 MiB [emitted] [minimized] (name: main)
cacheable modules 11.7 MiB
  ./src/test.js 7.86 KiB [built] [code generated]
  ./temp/bundle.js 11.7 MiB [built] [code generated]
external "fs/promises" 42 bytes [built] [code generated]
external "crypto" 42 bytes [built] [code generated]
external "buffer" 42 bytes [built] [code generated]
webpack 5.75.0 compiled successfully in 66356 ms
+ node ./temp/output.js
Looks ok
+ rm -rf ../.nyc_output
+ NODE_OPTIONS=--max-old-space-size=6000
+ npx nyc node ./src/test.js
Looks ok
------------|---------|----------|---------|---------|------------------------------------------------
File        | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s                              
------------|---------|----------|---------|---------|------------------------------------------------
All files   |   14.96 |     8.39 |   25.87 |   43.37 |                                                
 src        |      50 |    29.26 |   61.53 |   56.09 |                                                
  test.js   |      50 |    29.26 |   61.53 |   56.09 | 37-75,83-84,92,109-110                         
 temp       |   14.94 |     8.38 |   25.83 |   43.08 |                                                
  bundle.js |   14.94 |     8.38 |   25.83 |   43.08 | ...960,6967-6985,6993-7004,7014-7017,7025-7027 
------------|---------|----------|---------|---------|------------------------------------------------
+ node remove-unused.mjs
+ npx webpack
asset output.js 2.28 MiB [emitted] [minimized] (name: main)
cacheable modules 5.49 MiB
  ./src/test.js 7.86 KiB [built] [code generated]
  ./temp/bundle.js 5.49 MiB [built] [code generated]
external "fs/promises" 42 bytes [built] [code generated]
external "crypto" 42 bytes [built] [code generated]
external "buffer" 42 bytes [built] [code generated]
webpack 5.75.0 compiled successfully in 21771 ms
+ node ./temp/output.js
Looks ok
+ npx google-closure-compiler --js ./temp/bundle.js --js_output_file ./temp/bundle-out.js
+ mv ./temp/bundle-out.js ./temp/bundle.js
+ npx webpack
asset output.js 2.15 MiB [emitted] [minimized] (name: main)
cacheable modules 2.2 MiB
  ./src/test.js 7.86 KiB [built] [code generated]
  ./temp/bundle.js 2.19 MiB [built] [code generated]
external "fs/promises" 42 bytes [built] [code generated]
external "crypto" 42 bytes [built] [code generated]
external "buffer" 42 bytes [built] [code generated]
webpack 5.75.0 compiled successfully in 20662 ms
+ node ./temp/output.js
Looks ok