Fix setIn

src/index.ts

@@ -14,7 +14,7 @@ function lambda2path(accessor: Function) {
     return keys
   }
   let m = setter.match(funRe)
-  if (!m) {
+  if (!m || setter.indexOf('(') >= 0) {
     throw new Error('Invalid setter:' + setter)
   }
   let pathStr = m[1]
@@ -72,14 +72,30 @@ function mutate<T, V>(record: T, accessor: ((obj: T) => V) | string[], type: Mut
       : updator
   return newRecord
 }
-
+/**
+ * Set a deep child
+ * @param record The object to update, it can be a plain object or a class instance
+ * @param accessor A lambda function to get the key path, support dot, [''], [""], [1], **do not** support dynamic variable, function call, e.g.
+ * @param value The new value to set, if it is ignored it will be set to undefined.
+ */
 export function setIn<T, V>(record: T, accessor: ((obj: T) => V) | string[], value?: V): T {
-  if (value === void 0) {
-    return record
-  }
-  return mutate(record, accessor, MutateType.setIn, value)
+  return mutate(record, accessor, MutateType.setIn, value as V)
 }
-
+/**
+ * Unset a deep child
+ *
+ * @param record The object to update, it can be a plain object or a class instance
+ * @param accessor A lambda function to get the key path, support dot, [''], [""], [1], **do not** support dynamic variable, function call, e.g.
+ */
+export function unsetIn<T, V>(record: T, accessor: ((obj: T) => V | undefined) | string[]): T {
+  return mutate(record, accessor, MutateType.setIn, void 0)
+}
+/**
+ * Update a deep child by old value
+ * @param record The object to update, it can be a plain object or a class instance
+ * @param accessor A lambda function to get the key path, support dot, [''], [""], [1], **do not** support dynamic variable, function call, e.g.
+ * @param updator A update function that take the old value and return the new value.
+ */
 export function updateIn<T, V>(record: T, accessor: ((obj: T) => V) | string[], updator?: (v: V) => V): T {
   if (!updator) {
     return record

src/test/index.test.ts

@@ -107,6 +107,5 @@ describe('updateIn', () => {
   })
 })
 
-
 let newBook = mutator.setIn(book, _ => _.title.en, 'nnn')
 newBook = mutator.updateIn(book, _ => _.tags, t => [...t, 'novel'])