Add std/portable to list of exports

[chances]

According to the Portability documentation, I should be able to require("assemblyscript/std/portable") to make use of the portable standard library. However, Node crashes with the following error:

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './std/portable' is not defined by "exports" in /home/chances/GitHub/teraflop-d/source/scripting/api/node_modules/assemblyscript/package.json
    at applyExports (internal/modules/cjs/loader.js:487:9)
    at resolveExports (internal/modules/cjs/loader.js:503:23)
    at Function.Module._findPath (internal/modules/cjs/loader.js:631:31)
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:949:27)
    at Function.Module._load (internal/modules/cjs/loader.js:838:27)
    at Module.require (internal/modules/cjs/loader.js:1022:19)
    at require (internal/modules/cjs/helpers.js:72:18)
    at Object.<anonymous> (/home/chances/GitHub/teraflop-d/source/scripting/api/lib/index.js:4:1)
    at Module._compile (internal/modules/cjs/loader.js:1118:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1138:10) {
  code: 'ERR_PACKAGE_PATH_NOT_EXPORTED'
}

Reproduction steps:

With Node.js v13.14.0

1. In an empty folder, run npm install assemblyscript
2. Run the node REPL
3. Execute require("assemblyscript/std/portable")
4. Observe above error

Resolution

Adding std/portable to the list of exports resolves the issue.

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• I've read the contributing guidelines

[dcodeIO]

Thank you! :)