Non-throw error handling for getLatestMigrationVersion

Author: AuHau

src/index.js

@@ -14,6 +14,7 @@ exports.errors = errors
 
 /**
  * Returns the version of latest migration.
+ * If no migrations are present returns 0.
  *
  * @param {array?} migrations - Array of migrations to consider. If undefined, the bundled migrations are used. Mainly for testing purpose.
  * @returns {int}
@@ -22,7 +23,7 @@ function getLatestMigrationVersion (migrations) {
   migrations = migrations || defaultMigrations
 
   if (!Array.isArray(migrations) || migrations.length === 0) {
-    throw new errors.InvalidValueError('Migrations must be non-empty array!')
+    return 0
   }
 
   return migrations[migrations.length - 1].version

test/index.spec.js

@@ -80,10 +80,7 @@ describe('index.js', () => {
     const migrationsMock = createMigrations()
 
     expect(migrator.getLatestMigrationVersion(migrationsMock)).to.equal(4)
-
-    expect(
-      () => migrator.getLatestMigrationVersion([])
-    ).to.throw(errors.InvalidValueError).with.property('code', errors.InvalidValueError.code)
+    expect(migrator.getLatestMigrationVersion([])).to.equal(0)
   })
 
   describe('revert', () => {