update Polygon block explorer URL

main/store/migrations/index.js

@@ -83,7 +83,7 @@ const migrations = {
       type: 'ethereum',
       symbol: 'MATIC',
       name: 'Polygon',
-      explorer: 'https://explorer.matic.network',
+      explorer: 'https://polygonscan.com',
       gas: {
         price: {
           selected: 'standard',
@@ -202,7 +202,6 @@ const migrations = {
     return initial
   },
   10: initial => {  // Add Optimism to persisted networks
-    // if (!initial.main.networks.ethereum[10]) {
     initial.main.networks.ethereum[10] = {
       id: 10,
       type: 'ethereum',
@@ -338,6 +337,19 @@ const migrations = {
       }
     }
 
+    return initial
+  },
+  15: initial => {
+    // Polygon
+    if (initial.main.networks.ethereum['137']) {
+      const oldExplorer = initial.main.networks.ethereum['137'].explorer
+
+      if (!oldExplorer || oldExplorer.endsWith('explorer.matic.network')) {
+        // only replace if it hasn't been changed from the initial setting
+        initial.main.networks.ethereum['137'].explorer = 'https://polygonscan.com'
+      }
+    }
+
     return initial
   }
 }

main/store/state/index.js

@@ -424,7 +424,7 @@ const initial = {
           layer: 'sidechain',
           symbol: 'MATIC',
           name: 'Polygon',
-          explorer: 'https://explorer.matic.network',
+          explorer: 'https://polygonscan.com',
           gas: {
             price: {
               selected: 'standard',

test/main/store/migrations/index.test.js

@@ -249,3 +249,63 @@ describe('migration 14', () => {
     expect(arbitrum.gas.fees.maxFeePerGas).toBe('0xf')
   })
 })
+
+describe('migration 15', () => {
+  beforeEach(() => {
+    state = {
+      main: {
+        _version: 14,
+        networks: {
+          ethereum: {
+            137: {
+              id: 1,
+              type: 'ethereum',
+              layer: 'sidechain',
+              symbol: 'MATIC',
+              name: 'Polygon',
+              explorer: 'https://explorer.matic.network',
+              connection: {
+                primary: {
+                  on: true,
+                  current: 'matic'
+                },
+                secondary: {
+                  on: false,
+                  current: 'local'
+                }
+              }
+            }
+          }
+        },
+        networksMeta: {
+          ethereum: { }
+        }
+      }
+    }
+  })
+
+  it('updates the initial explorer for Polygon', () => {
+    const updatedState = migrations.apply(state)
+    const polygon = updatedState.main.networks.ethereum['137']
+
+    expect(polygon.explorer).toBe('https://polygonscan.com')
+  })
+
+  it('adds the Polygon explorer if one does not exist', () => {
+    delete state.main.networks.ethereum['137'].explorer
+
+    const updatedState = migrations.apply(state)
+    const polygon = updatedState.main.networks.ethereum['137']
+
+    expect(polygon.explorer).toBe('https://polygonscan.com')
+  })
+
+  it('does not update the Polygon explorer if it has been manually changed', () => {
+    state.main.networks.ethereum['137'].explorer = 'https://custom-explorer.io'
+
+    const updatedState = migrations.apply(state)
+    const polygon = updatedState.main.networks.ethereum['137']
+
+    expect(polygon.explorer).toBe('https://custom-explorer.io')
+  })
+})