TypeError: Cannot read property 'mana' of undefined
at new OvalePowerClass (E:\Dropbox\Projects\Ovale\Ovale\dist\Power.js:332:75)
at Object. (E:\Dropbox\Projects\Ovale\Ovale\dist\Power.js:598:22)
at Module._compile (internal/modules/cjs/loader.js:689:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
at Module.load (internal/modules/cjs/loader.js:599:32)
at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
at Function.Module._load (internal/modules/cjs/loader.js:530:3)
at Module.require (internal/modules/cjs/loader.js:637:17)
at require (internal/modules/cjs/helpers.js:20:18)
at Object. (E:\Dropbox\Projects\Ovale\Ovale\dist\Compile.js:12:17)

Trying to run npm run simc

You will need to add condition to check if class is defined by importsimc.js
in Power.ts on line 327

if(Ovale.playerClass != undefined){
    for (const [powerType, powerId] of pairs(Enum.PowerType)) {
        let powerTypeLower = strlower(powerType);
        let powerToken = possiblePowerTypes[Ovale.playerClass][powerTypeLower];
        if (powerToken) {
            this.POWER_TYPE[powerId] = powerTypeLower;
            this.POWER_TYPE[powerToken] = powerTypeLower;
            this.POWER_INFO[powerTypeLower] = {
                id: powerId,
                token: powerToken,
                mini: 0,
                maxCost: (powerTypeLower == "combopoints" && MAX_COMBO_POINTS) || 0 // Not currently used.
            }
        }
    }
}

or just change line with powerToken to

let powerToken = Ovale.playerClass != undefined && possiblePowerTypes[Ovale.playerClass][powerTypeLower];

There is actually a deeper bug here. I'm working on a PR wrm but currently afk. The issue with this is where playerClass is set by select(2) off of wowmock but it should be a select (1).

Going off memory though! Definitely working on my fork more later tonight.