fix: change bundle's id to just be hash of content

Previusly the hash was determined by the name and version of the module, in addition to the path to
and content of the file. We now just look at the content

BREAKING CHANGE: Hashing stretegy has changed

lib/writer.js

@@ -27,9 +27,7 @@ class Stream extends Readable {
                 bundleCssModule(file),
                 identifyCssModule(file),
             ]);
-            meta.id = hasher(
-                `${meta.name}|${meta.version}|${meta.file}|${css}`
-            );
+            meta.id = hasher(css);
             meta.content = css;
             this.push(meta);
         } catch (err) {

test/writer.test.js

@@ -61,7 +61,6 @@ test('bundleCssModule(filePath)', async () => {
 test('new Writer(filePath)', done => {
     expect.assertions(2);
     const filePath = path.join(__dirname, 'test-assets/my-module-1/main.css');
-    const fileRef = 'my-module-1/main.css';
 
     const writer = new Writer(filePath).bundle();
     const items = [];
@@ -73,9 +72,7 @@ test('new Writer(filePath)', done => {
     writer.on('end', () => {
         const result1 = items[0];
         const result2 = items[1];
-        expect(result1.id).toBe(
-            hasher(`my-module-1|1.0.1|${fileRef}|${result1.content}`)
-        );
+        expect(result1.id).toBe(hasher(result1.content));
         expect(result2).toBeFalsy();
         done();
     });
@@ -118,7 +115,6 @@ test('new Writer(filePath) relative paths throw error', () => {
 test('new Writer([filePath])', done => {
     expect.assertions(2);
     const filePath = path.join(__dirname, 'test-assets/my-module-1/main.css');
-    const fileRef = 'my-module-1/main.css';
 
     const writer = new Writer([filePath]).bundle();
     const items = [];
@@ -130,9 +126,7 @@ test('new Writer([filePath])', done => {
     writer.on('end', () => {
         const result1 = items[0];
         const result2 = items[1];
-        expect(result1.id).toBe(
-            hasher(`my-module-1|1.0.1|${fileRef}|${result1.content}`)
-        );
+        expect(result1.id).toBe(hasher(result1.content));
         expect(result2).toBeFalsy();
         done();
     });
@@ -144,7 +138,6 @@ test('Writer processes @import statements', done => {
         __dirname,
         'test-assets/my-module-3/css/main.css'
     );
-    const fileRef = 'my-module-3/css/main.css';
 
     const writer = new Writer([filePath]).bundle();
     const items = [];
@@ -157,9 +150,7 @@ test('Writer processes @import statements', done => {
         const result1 = items[0];
         const result2 = items[1];
 
-        expect(result1.id).toBe(
-            hasher(`my-module-3|1.0.1|${fileRef}|${result1.content}`)
-        );
+        expect(result1.id).toBe(hasher(result1.content));
         expect(result1.content).toMatch('my-module-3/main.css');
         expect(result1.content).toMatch('my-module-3/dep.css');
         expect(result1.content).toMatch('dep/main.css');
@@ -171,12 +162,10 @@ test('Writer processes @import statements', done => {
 test('new Writer([filePath1, filePath2]) ensures correct order', done => {
     expect.assertions(3);
     const filePath1 = path.join(__dirname, 'test-assets/my-module-1/main.css');
-    const fileRef1 = 'my-module-1/main.css';
     const filePath2 = path.join(
         __dirname,
         'test-assets/my-module-2/css/main.css'
     );
-    const fileRef2 = 'my-module-2/css/main.css';
 
     const writer = new Writer([filePath1, filePath2]).bundle();
     const items = [];
@@ -190,12 +179,8 @@ test('new Writer([filePath1, filePath2]) ensures correct order', done => {
         const result2 = items[1];
         const result3 = items[2];
 
-        expect(result1.id).toBe(
-            hasher(`my-module-1|1.0.1|${fileRef1}|${result1.content}`)
-        );
-        expect(result2.id).toBe(
-            hasher(`my-module-2|1.0.1|${fileRef2}|${result2.content}`)
-        );
+        expect(result1.id).toBe(hasher(result1.content));
+        expect(result2.id).toBe(hasher(result2.content));
         expect(result3).toBeFalsy();
         done();
     });