proposal: syscall/js: publish wasm_exec.js and wasm_exec_node.js bindings to npm

[russellsteadman]

Issue

Currently the wasm_exec.js and wasm_exec_node.js files for executing WASM builds have to be manually added to JavaScript projects. This creates versioning issues, type issues for TypeScript projects, and is not a normal workflow for larger projects.

Solution

Create and publish a package containing wasm_exec.js and wasm_exec_node.js to npm. Add built-in TypeScript definitions.

Implementation

If this is selected to move forward, I can create a pull request.

[Zxilly]

But these files are not as new as they are; instead, they should correspond precisely to the version of Go being used.
Probably copying the files from misc/wasm during the build process would be a better choice.