Expose as module and use browserify (#53)

Expose as module

 Switch base library to commonjs format

Use require() rather than implicit global for StackTrace dependency.

Dedent library source, losing blame unfortunately.

Link test.html to built source that adds UMD wrapper.

Update eslint config to expect commonjs source everywhere.

Drop special handling for StackTrace object being undefined.

Fixes: #2

 Bundle dist script with browserify

Change gulp dist task from concatting prebuilt source to building
from components and bundling using browserify.

Supply polyfills from core-js via browserify require, based on the
upstream polyfills in stacktrace-js. This may be overly conservative
as browsers back to IE 9 have good enough ES5 support, just filling
Promise is probably be reasonable.



* Update dependencies and drop to nise from sinon

The fake-xhr part of sinon has been split to its own package, so can
just use that drop a few unused packages.

Author: bz2

.eslintrc.json

@@ -1,6 +1,7 @@
 {
   "env": {
-    "browser": true
+    "browser": true,
+    "commonjs": true
   },
   "extends": [
     "eslint:recommended"
@@ -58,7 +59,7 @@
     },
     "globals": {
       "chai": false,
-      "sinon": false,
+      "nise": false,
       "StackdriverErrorReporter": false
     },
     "plugins": [

gulpfile.js

@@ -13,25 +13,39 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-/* global require */
+var browserify = require('browserify');
 var gulp = require('gulp');
 var rename = require('gulp-rename');
 var replace = require('gulp-replace');
 var uglify = require('gulp-uglify');
 var sourcemaps = require('gulp-sourcemaps');
-var concat = require('gulp-concat');
+var buffer = require('vinyl-buffer');
+var source = require('vinyl-source-stream');
 
 var SRC_FILE = 'stackdriver-errors.js';
 var DEST = 'dist/';
 
-var dependencies = [
-  './node_modules/stacktrace-js/dist/stacktrace-with-promises-and-json-polyfills.js',
+var polyfills = [
+  'core-js/fn/array/filter',
+  'core-js/fn/array/for-each',
+  'core-js/fn/array/map',
+  'core-js/fn/function/bind',
+  'core-js/fn/promise',
 ];
 
-gulp.task('dist', function() {
-  return gulp.src(dependencies.concat(SRC_FILE))
+gulp.task('lib-concat', function() {
+  return browserify({
+    debug: true,
+    entries: SRC_FILE,
+    standalone: 'StackdriverErrorReporter',
+  })
+    .require(polyfills)
+    .plugin('browser-pack-flat/plugin')
+    .bundle()
+    .pipe(source(SRC_FILE))
+    .pipe(rename({suffix: '-concat'}))
+    .pipe(buffer())
     .pipe(sourcemaps.init({loadMaps: true}))
-    .pipe(concat(SRC_FILE.replace('.js', '-concat.js')))
     // This will output the non-minified version
     .pipe(gulp.dest(DEST))
     // This will minify and rename to stackdriver-errors.min.js
@@ -58,5 +72,5 @@ gulp.task('demo-js', function() {
     .pipe(gulp.dest('dist'));
 });
 
-gulp.task('default', ['dist']);
-gulp.task('demo', ['dist', 'demo-html', 'demo-js']);
+gulp.task('default', ['lib-concat']);
+gulp.task('demo', ['lib-concat', 'demo-html', 'demo-js']);