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Merge pull request #2516 from MetaMask/i2507-DoubleWeb3Error

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Add useful error when duplicate web3 is detected.
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Thomas Huang 2017-11-20 11:38:41 -06:00 committed by GitHub
commit 408bbe726f
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CHANGELOG.md
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@ -2,6 +2,8 @@
## Current Master ## Current Master
- Detect when multiple web3 extensions are active, and provide useful error.
## 3.12.0 2017-10-25 ## 3.12.0 2017-10-25
- Add support for alternative ENS TLDs (Ethereum Name Service Top-Level Domains). - Add support for alternative ENS TLDs (Ethereum Name Service Top-Level Domains).

7
app/scripts/inpage.js
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@ -31,6 +31,13 @@ var inpageProvider = new MetamaskInpageProvider(metamaskStream)
// setup web3 // setup web3
// //
if (typeof window.web3 !== 'undefined') {
throw new Error(`MetaMask detected another web3.
MetaMask will not work reliably with another web3 extension.
This usually happens if you have two MetaMasks installed,
or MetaMask and another web3 extension. Please remove one
and try again.`)
}
var web3 = new Web3(inpageProvider) var web3 = new Web3(inpageProvider)
web3.setProvider = function () { web3.setProvider = function () {
log.debug('MetaMask - overrode web3.setProvider') log.debug('MetaMask - overrode web3.setProvider')