Another crack at bundling the extension with webpack (VSCodeVim#4690)

This broke the extension last time we tried 🙂
The main benefit is shipping a smaller bundle, which leads to slightly faster startup times.
Fixes VSCodeVim#3127

.travis.yml

@@ -38,7 +38,8 @@ script:
     echo "Prettier Failed. Run `gulp forceprettier` and commit changes to resolve.";
     exit 1;
   fi
-- npm run build
+- gulp build
+- gulp prepare-test
 - npm test
 
 before_deploy:

.vscodeignore

@@ -1,12 +1,25 @@
 .github/**
+
 .vscode/**
 .vscode-test/**
+
+**/*.ts
+**/*.map
+*.yml
+
+src/**
 build/**
-out/test/**
 test/**
 typings/**
-**/*.ts
-**/*.map
-.github_changelog_generator
+out/test/**
+node_modules/**
+images/design/**
+
 .gitignore
-*.yml
+
+tsconfig.json
+tslint.json
+webpack.config.js
+gulpfile.js
+renovate.json
+.github_changelog_generator

gulpfile.js

@@ -7,7 +7,9 @@ var gulp = require('gulp'),
   ts = require('gulp-typescript'),
   PluginError = require('plugin-error'),
   minimist = require('minimist'),
-  path = require('path');
+  path = require('path'),
+  webpack_stream = require('webpack-stream'),
+  webpack_config = require('./webpack.config.js');
 
 const exec = require('child_process').exec;
 const spawn = require('child_process').spawn;
@@ -133,6 +135,10 @@ function updateVersion(done) {
     });
 }
 
+function copyPackageJson() {
+  return gulp.src('./package.json').pipe(gulp.dest('out'));
+}
+
 gulp.task('tsc', function () {
   var isError = false;
 
@@ -153,6 +159,10 @@ gulp.task('tsc', function () {
     .pipe(gulp.dest('out'));
 });
 
+gulp.task('webpack', function () {
+  return gulp.src('./extension.ts').pipe(webpack_stream(webpack_config)).pipe(gulp.dest('out'));
+});
+
 gulp.task('tslint', function () {
   const program = require('tslint').Linter.createProgram('./tsconfig.json');
   return gulp
@@ -184,7 +194,7 @@ gulp.task('commit-hash', function (done) {
 });
 
 // test
-gulp.task('test', function (done) {
+gulp.task('run-test', function (done) {
   // the flag --grep takes js regex as a string and filters by test and test suite names
   var knownOptions = {
     string: 'grep',
@@ -235,7 +245,9 @@ gulp.task('test', function (done) {
   });
 });
 
-gulp.task('build', gulp.series('prettier', gulp.parallel('tsc', 'tslint'), 'commit-hash'));
+gulp.task('build', gulp.series('prettier', gulp.parallel('webpack', 'tslint'), 'commit-hash'));
+gulp.task('prepare-test', gulp.parallel('tsc', copyPackageJson));
+gulp.task('test', gulp.series('prepare-test', 'run-test'));
 gulp.task('changelog', gulp.series(validateArgs, createChangelog));
 gulp.task(
   'release',