fix: map final empty value. fixes #124 (#125)

Author: Victor Andrée

index.js

@@ -180,7 +180,7 @@ class CsvParser extends Transform {
     }
 
     if (buf[end - 1] === comma) {
-      cells.push(this._empty)
+      cells.push(mapValue(this._empty))
     }
 
     const skip = this.skipLines && this.skipLines > this._line

test/mapValues.test.js

@@ -22,3 +22,19 @@ test.cb('map values', (t) => {
 
   collect('dummy.csv', { mapValues }, verify)
 })
+
+test.cb('map last empty value', (t) => {
+  const mapValues = ({ value }) => {
+    return value === '' ? null : value
+  }
+
+  const verify = (err, lines) => {
+    t.false(err, 'no err')
+    t.is(lines.length, 2, '2 rows')
+    t.is(lines[0]['name'], null, 'name is mapped')
+    t.is(lines[0]['location'], null, 'last value mapped')
+    t.end()
+  }
+
+  collect('empty_columns.csv', { mapValues, headers: ['date', 'name', 'location'] }, verify)
+})