Compiling Roy to JS fails: SourceMapGenerator undefined

[Andreas Hartmann]

Hi Brian, hi all,

first of all, thanks for your great work!

I checked out Roy from github, but when I'm trying to compile a Roy file to JS, I get the following error:

roy -r examples/helloworld.roy

compile.js:817
        var sourceMap = new SourceMapGenerator({file: path.basename(outputPath
                        ^
TypeError: undefined is not a function
    at main (compile.js:817:25)
    at Array.forEach (native)
    at Function._.each._.forEach (/Volumes/Data/src/roy/roy/node_modules/underscore/underscore.js:74:11)
    at Object.main (/Volumes/Data/src/roy/roy/src/compile.js:803:7)
    at Object.<anonymous> (/Volumes/Data/src/roy/roy/roy:2:26)
    at Module._compile (module.js:449:26)
    at Object.Module._extensions..js (module.js:467:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.runMain (module.js:492:10)


It looks like the source-map module is not properly loaded.
Thanks a lot in advance for any hints!

-- Andreas

[Andreas Hartmann]

It seems to be related to a change in RequireJS 2.1.

More info: https://github.com/jrburke/requirejs/issues/490

This workaround helps:

        var oldSetTimeout = setTimeout;
        setTimeout = undefined;
        var SourceMapGenerator = require('source-map').SourceMapGenerator;
        setTimeout = oldSetTimeout;

[Brian McKenna]

That is very strange. I just got a new work computer so I did a clean
install of Roy and I have no problem with the source-map module.

Can you let me know what version of node.js you have and what version
of source-map got installed?

[Andreas Hartmann]

node.js: v0.8.11
source-map: 0.1.0

IIUC the problem lies in node_modules/source-map/node_modules/requirejs/require.js:

    /**
     * Execute something after the current tick
     * of the event loop. Override for other envs
     * that have a better solution than setTimeout.
     * @param  {Function} fn function to execute later.
     */
    req.nextTick = typeof setTimeout !== 'undefined' ? function (fn) {
        setTimeout(fn, 4);
    } : function (fn) { fn(); };

The code within the module is executed asynchronously. Since the source-map module is required inline in compile.js (as opposed to using a callback), the code within the module is not executed before the execution in compile.js is resumed, leading to undefined properties in the "exports" object.

[Katie Miller]

I just installed Node and Roy and I get the same stack trace.

node.js version: 0.8.14

source-map version: 0.1.0

[Dominic Bou-Samra]

Hmm, I sent a pull request earlier with the latest source-map version in the dependencies. I probably should have read this thread before, and actually tried to figure out why there error was occurring. Hopefully nothing is broken with the new version.

[Andreas Hartmann]

Thanks! With the new source map version 0.1.8 in HEAD the error doesn't occur anymore.