Make emsdk-npm package versions follow EMSDK releases

[devappd]

To follow this versioning scheme, make the NPM releases consistent with EMSDK. (This concerns emsdk-npm only).

• Implement this by git branching for each EMSDK version. Branches are named v2.0.11, v2.0.10, etc. In each branch, store a default_version.js file that contains the EMSDK version string. This file sets the release to download for the rest of the package. Don't make the version string modifiable by the user. package.json is also edited to reflect the version.
• Install EMSDK on npm install step when version is hardcoded
• Make a CI runner to:
  • Mergemain changes to each version branch
  • Publish updated version branches
• Make a CI runner to:
  • Check for new EMSDK versions
  • Prepare a new version branch
  • Test the new version branch
  • Publish to NPM
  • Tag latest only for the latest possible SDK version (don't publish latest tag for older versions)
• Investigate whether NPM recognizes +build version syntax and ranges them correctly. The +build part will track each main code merge. (e.g. v2.0.11+1609425262 represents the main revision dated 12/31/2020 that serves EMSDK 2.0.11)
  • +build information is skipped per semver spec, see StackOverflow and NPM. This has induced the "workaround" convention of using -prerelease info to denote precedence (see: vscode).
  • Resolution: Use v2.0.11-1609425262 version format Use v2.0.11-0 format
  • Practical example:
    • https://www.npmjs.com/package/flex-sdk
    • https://gist.github.com/JamesMGreene/9916485
    • Install string will likely be npm install -D emscripten-sdk ~2.0.11-0
• Track separate NPM packages for the following scenarios:
  • emscripten-sdk: Versioned packages in llvm backend, e.g., emscripten-sdk@2.0.11, emscripten-sdk@2.0.10, etc.
  • emscripten-sdk-npm: Generic package for full control: e.g., requesting latest, fastcomp, tot

Versioning syntax

• https://docs.npmjs.com/cli/v6/using-npm/semver
• https://semver.org/

[devappd]

• Figure out why deploys fail in certain versions

EDIT: This now works in every version except 1.39.9

Log

npm publish --tag=${GITHUB_REF##*/} --access public
  shell: /bin/bash -e {0}
  env:
    NPM_CONFIG_USERCONFIG: /home/runner/work/_temp/.npmrc
    NODE_AUTH_TOKEN: ***
npm notice 
npm notice 📦  emscripten-sdk@1.40.0-1
npm notice === Tarball Contents === 
npm notice 1.1kB LICENSE                           
npm notice 99B   test/example-build/main.cpp       
npm notice 3.9kB src/common.js                     
npm notice 1.8kB src/emsdk-checkout.js             
npm notice 1.8kB src/emsdk-pull.js                 
npm notice 4.2kB src/emsdk-run.js                  
npm notice 2.0kB src/emsdk.js                      
npm notice 4.9kB src/index.js                      
npm notice 3.2kB src/path.js                       
npm notice 1.8kB src/postinstall.js                
npm notice 4.5kB test/test.js                      
npm notice 3.9kB src/version.js                    
npm notice 801B  package.json                      
npm notice 681B  docs/How-It-Works.md              
npm notice 1.2kB .github/workflows/README.md       
npm notice 3.6kB readme.md                         
npm notice 1.3kB .github/workflows/deploy-emsdk.yml
npm notice 1.5kB .github/workflows/deploy-npm.yml  
npm notice 624B  .github/workflows/test-branch.yml 
npm notice === Tarball Details === 
npm notice name:          emscripten-sdk                          
npm notice version:       1.40.0-1                                
npm notice package size:  10.0 kB                                 
npm notice unpacked size: 42.9 kB                                 
npm notice shasum:        415459464b398504db3965decffc10bdfa253bb9
npm notice integrity:     sha512-+jyB336qgecx0[...]GBEmTJlA9ZoyQ==
npm notice total files:   19                                      
npm notice 
npm ERR! code E400
npm ERR! 400 Bad Request - PUT https://registry.npmjs.org/emscripten-sdk - Must associate a single dist tag with new publishes.
npm ERR! A complete log of this run can be found in:

npm ERR!     /home/runner/.npm/_logs/2021-01-13T19_02_00_638Z-debug.log