style: prefer const over let

Prefer const over let when the binding is static, in order to comply with an upcoming Standard rule.

Author: LinusU

src/config.js

@@ -41,7 +41,7 @@ module.exports = (store) => {
         if (key !== undefined && !_has(config, key)) {
           return callback(new Error('Key ' + key + ' does not exist in config'))
         }
-        let value = key !== undefined ? _get(config, key) : config
+        const value = key !== undefined ? _get(config, key) : config
         callback(null, value)
       })
     },

test/node.js

@@ -22,7 +22,7 @@ describe('IPFS Repo Tests onNode.js', () => {
           return callback(new Error('already locked'))
         }
 
-        let lockPath = path.join(dir, customLock.lockName)
+        const lockPath = path.join(dir, customLock.lockName)
         fs.writeFileSync(lockPath, '')
 
         callback(null, {