Add sourceMaps and vscode debug configurations

[aviettran]

These are tooling changes that I made for another upcoming change. I want to get them reviewed in their own separate PR.

Source maps:
Unlike the server, these maps are stored alongside the transpired js. Browsers make requests for them when dev tools are in use.

Launch configs:
These require an already running HTTP server. You can launch the debugger from vscode and it will build and then launch Chrome.

[Zarel]

Thanks!

[AnnikaCodes]

This seems to be causing build failures. It first complained about a missing source-map dependency; even after installing that there is a more complex error:

$ node build full
Syncing data from Git repository... From https://github.com/smogon/pokemon-showdown
   84f3b4ad4..94cc6115c  master     -> origin/master
DONE
Loading gen 6 data... DONE
Building `data/search-index.js`...
(WARNING: NO ARTICLES)
DONE
Building `data/teambuilder-tables.js`... DONE
Building `data/pokedex.js`... DONE
Building `data/moves,items,abilities,typechart,learnsets.js`...DONE
Updating file `data/learnsets-g6`... DONE
Updating animated sprite dimensions... SKIPPED
Updating version... DONE
Compiling TS files... /Users/annika/pokemon-showdown-client/build-tools/compiler.js:67
      consumer.eachMapping(function (mapping) {
               ^

TypeError: consumer.eachMapping is not a function
    at combineResults (/Users/annika/pokemon-showdown-client/build-tools/compiler.js:67:16)
    at Object.compileToFile (/Users/annika/pokemon-showdown-client/build-tools/compiler.js:212:20)
    at Object.<anonymous> (/Users/annika/pokemon-showdown-client/build-tools/update:105:27)
    at Module._compile (node:internal/modules/cjs/loader:1103:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1155:10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:77:12)
    at node:internal/main/run_main_module:17:47
node:child_process:905
    throw err;
    ^

Error: Command failed: node ./build-tools/update full
    at checkExecSyncError (node:child_process:828:11)
    at execSync (node:child_process:902:15)
    at Object.<anonymous> (/Users/annika/pokemon-showdown-client/build:70:1)
    at Module._compile (node:internal/modules/cjs/loader:1103:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1155:10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:77:12)
    at node:internal/main/run_main_module:17:47 {
  status: 1,
  signal: null,
  output: [ null, null, null ],
  pid: 1222,
  stdout: null,
  stderr: null
}

Do we know what's going on here?

[aviettran]

I wonder if a transient dependency botched this. #1970

[urkerab]

If I've understood the history correctly, it looks to be the switch from babel-cli to babel-core; the custom version of babel-cli obviously had its own dependency on source-map but when it was integrated into the build the source-map dependency got lost.