Validate options is a plain object

ehmicky · May 15, 2019 · 79e1789 · 79e1789
1 parent 6964ce3
commit 79e1789
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Showing 2 changed files with 18 additions and 1 deletion.
diff --git a/src/options.js b/src/options.js
@@ -1,14 +1,16 @@
 import { validate } from 'jest-validate'
 import isCi from 'is-ci'
 
-import { pickBy } from './utils.js'
+import { isPlainObject, pickBy } from './utils.js'
 
 // Parse options
 export const parseOpts = function({
   opts = {},
   defaultOpts = {},
   forcedOpts = {},
 }) {
+  validateOpts({ opts })
+
   const optsA = pickBy(opts, value => value !== undefined)
 
   const exampleConfig = pickBy(
@@ -24,6 +26,12 @@ export const parseOpts = function({
   return optsC
 }
 
+const validateOpts = function({ opts }) {
+  if (!isPlainObject(opts)) {
+    throw new Error(`options must be a plain object: ${opts}`)
+  }
+}
+
 const DEFAULT_OPTS = {
   verbose: isCi,
 }

diff --git a/src/utils.js b/src/utils.js
@@ -5,3 +5,12 @@ export const pickBy = function(object, condition) {
   )
   return Object.fromEntries(pairs)
 }
+
+// Is a plain object, including `Object.create(null)`
+export const isPlainObject = function(val) {
+  return (
+    typeof val === 'object' &&
+    val !== null &&
+    (val.constructor === Object || val.constructor === undefined)
+  )
+}