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metamask-extension/app/scripts/migrations/004.js

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import { cloneDeep } from 'lodash'
const version = 4
export default {
version,
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migrate(versionedData) {
const safeVersionedData = cloneDeep(versionedData)
safeVersionedData.meta.version = version
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try {
if (safeVersionedData.data.config.provider.type !== 'rpc') {
return Promise.resolve(safeVersionedData)
}
switch (safeVersionedData.data.config.provider.rpcTarget) {
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case 'https://testrpc.metamask.io/':
safeVersionedData.data.config.provider = {
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type: 'testnet',
}
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break
case 'https://rpc.metamask.io/':
safeVersionedData.data.config.provider = {
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type: 'mainnet',
}
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break
// No default
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}
} catch (_) {
// empty
}
return Promise.resolve(safeVersionedData)
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},
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}