Added Types and Unit tests

test/index.js

@@ -0,0 +1,75 @@
+const { expect, it } = require('@jest/globals');
+const { parseCSV } = require('./../src/index');
+
+describe('parseCSV', () => {
+  it('should parse a csv file', () => {
+    const csv = 'Name,Age,Location\nDom,26,"Sydney, Australia"\nSteve,30,"New York, USA"';
+
+    parseCSV(csv, (headers,line,index) => {
+      //Headers are parsed as arrays of strings
+      expect(headers).toEqual([ 'Name', 'Age', 'Location' ]);
+
+      switch(index) {
+        case 1:
+          expect(line).toEqual([ 'Dom', '26', 'Sydney, Australia' ]);
+          break;
+        case 2:
+          expect(line).toEqual([ 'Steve', '30', 'New York, USA' ]);
+          break;
+      }
+
+      return true;
+    });
+  });
+
+  it('should skip blank lines', () => {
+    //Line 2 is blank, Line 3 ends with a return carraige
+    const csv = 'Name,Age,Location\n,,\nSteve,30,"New York, USA"\n\rDom,26,"Sydney, Australia"';
+
+    parseCSV(csv, (headers,line,index) => {
+      expect(headers).toEqual([ 'Name', 'Age', 'Location' ]);
+
+      switch(index) {
+        case 1:
+          expect(line).toEqual([ 'Steve', '30', 'New York, USA' ]);
+          break;
+        case 2:
+          expect(line).toEqual([ 'Dom', '26', 'Sydney, Australia' ]);
+          break;
+      }
+
+      return;
+    });
+  });
+
+  it('should break when returning false', () => {
+    const csv = 'Name,Age,Location\nDom,26,"Sydney, Australia"\nSteve,30,"New York, USA"';
+
+    parseCSV(csv, (headers,line,index) => {
+      expect(line).toEqual([ 'Dom', '26', 'Sydney, Australia' ]);
+      expect(index).not.toEqual(2);
+      return false;
+    });
+  });
+
+  it('should be allowed to not skip blanks', () => {
+    
+    //Line 2 is blank, Line 3 ends with a return carraige
+    const csv = 'Name,Age,Location\n,,\nSteve,30,"New York, USA"\n\rDom,26,"Sydney, Australia"';
+
+    parseCSV(csv, (headers,line,index) => {
+      expect(headers).toEqual([ 'Name', 'Age', 'Location' ]);
+
+      switch(index) {
+        case 1:
+          expect(line).toEqual([ '', '', '' ]);
+          break;
+        case 2:
+          expect(line).toEqual([ 'Steve', '30', 'New York, USA' ]);
+          break;
+      }
+
+      return;
+    }, { skipBlanks: false });
+  });
+});