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Bluebird warnings triggered by vue-loader #625

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@sudo-suhas

Description

@sudo-suhas

Setup

OS - Windows 8
Node.js - 6.9.4
Webpack - 2.2.1
vue-loader - 10.2.1

I am using a modified version of vue-cli webpack template.

Issue

If we use bluebird as our global Promise library(global.Promise = require('bluebird')), it triggers warnings from bluebird due to this.

If the postcss.then() call was to return null, the warning should be silenced as mentioned in the bluebird docs.

Stack trace
(node:14520) Warning: a promise was created in a handler but was not returned from it, see http://goo.gl/rRqMUw
    at new Promise (E:\workspace\odyssey\node_modules\bluebird\js\release\promise.js:77:14)
    at runCallback (timers.js:637:20)
    at tryOnImmediate (timers.js:610:5)
    at processImmediate [as _immediateCallback] (timers.js:582:5)
From previous event:
    at LazyResult.async (E:\workspace\odyssey\node_modules\postcss\lib\lazy-result.js:227:27)
    at LazyResult.then (E:\workspace\odyssey\node_modules\postcss\lib\lazy-result.js:131:21)
    at processCss (E:\workspace\odyssey\node_modules\css-loader\lib\processCss.js:200:5)
    at Object.module.exports (E:\workspace\odyssey\node_modules\css-loader\lib\loader.js:24:2)
    at LOADER_EXECUTION (E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:119:14)
    at runSyncOrAsync (E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:120:4)
    at iterateNormalLoaders (E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:229:2)
    at iterateNormalLoaders (E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:218:10)
    at E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:233:3
    at context.callback (E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:111:13)
    at E:\workspace\odyssey\node_modules\vue-loader\lib\style-rewriter.js:99:7
From previous event:
    at LazyResult.then (E:\workspace\odyssey\node_modules\postcss\lib\lazy-result.js:131:29)
    at Object.module.exports (E:\workspace\odyssey\node_modules\vue-loader\lib\style-rewriter.js:97:6)
    at LOADER_EXECUTION (E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:119:14)
    at runSyncOrAsync (E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:120:4)
    at iterateNormalLoaders (E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:229:2)
    at iterateNormalLoaders (E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:218:10)
    at E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:233:3
    at Object.context.callback (E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:111:13)
    at Object.module.exports (E:\workspace\odyssey\node_modules\vue-loader\lib\selector.js:14:8)
    at LOADER_EXECUTION (E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:119:14)
    at runSyncOrAsync (E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:120:4)
    at iterateNormalLoaders (E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:229:2)
    at iterateNormalLoaders (E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:218:10)
    at E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:233:3
    at Object.context.callback (E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:111:13)
    at Object.module.exports (E:\workspace\odyssey\node_modules\eslint-loader\index.js:182:8)
    at LOADER_EXECUTION (E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:119:14)
    at runSyncOrAsync (E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:120:4)
    at iterateNormalLoaders (E:\workspace\odyssey\node_modules\loader-runner\lib\LoaderRunner.js:229:2)

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