fix: factorise the verification code in a function

lib/verify-config.js

@@ -1,19 +1,22 @@
 const {isString, isUndefined, isBoolean} = require('lodash');
 const getError = require('./get-error');
 
-module.exports = ({npmPublish, tarballDir, pkgRoot}) => {
-  const errors = [];
-  if (!isUndefined(npmPublish) && !isBoolean(npmPublish)) {
-    errors.push(getError('EINVALIDNPMPUBLISH', {npmPublish}));
-  }
+const isNonEmptyString = value => isString(value) && value.trim();
 
-  if (!isUndefined(tarballDir) && !isString(tarballDir)) {
-    errors.push(getError('EINVALIDTARBALLDIR', {tarballDir}));
-  }
+const VALIDATORS = {
+  npmPublish: isBoolean,
+  tarballDir: isNonEmptyString,
+  pkgRoot: isNonEmptyString,
+};
 
-  if (!isUndefined(pkgRoot) && !isString(pkgRoot)) {
-    errors.push(getError('EINVALIDPKGROOT', {pkgRoot}));
-  }
+module.exports = options => {
+  const errors = Object.entries(options).reduce(
+    (errors, [option, value]) =>
+      !isUndefined(value) && value !== false && !VALIDATORS[option](value)
+        ? [...errors, getError(`EINVALID${option.toUpperCase()}`, {[option]: value})]
+        : errors,
+    []
+  );
 
   return errors;
 };