chore: publish commonjs and es6 (modules) files

Node.js (non-web) tooling generally prefers CommonJS, and web tooling (e.g., parcel-bundler) generally works better with ES6 modules (for tree shaking).

The paths for ES6 modules are `cxp/module/...` (`cxp/lib/...` is for CommonJS).

Author: sqs

.gitignore

@@ -4,3 +4,4 @@ coverage/
 .nyc_output/
 dist
 .cache/
+/module/

.travis.yml

@@ -14,7 +14,7 @@ script:
   - npm run prettier
   - npm run tslint
   - npm run build
-  - npm run build:all
+  - npm run typecheck
   - npm run cover
   - ./node_modules/.bin/nyc report --reporter json
   - bash <(curl -s https://codecov.io/bash)

.vscode/tasks.json

@@ -3,7 +3,7 @@
   "tasks": [
     {
       "type": "npm",
-      "script": "watch",
+      "script": "watch:typecheck",
       "problemMatcher": ["$tsc-watch"],
       "isBackground": true
     },

package-lock.json

@@ -12,20 +12,26 @@
     "url": "https://github.com/sourcegraph/cxp-js/issues"
   },
   "main": "lib/index.js",
+  "module": "module/index.js",
   "files": [
-    "lib"
+    "lib",
+    "module"
   ],
   "scripts": {
     "commitmsg": "commitlint -e $GIT_PARAMS",
     "semantic-release": "semantic-release",
     "prettier": "prettier '**/*.{js?(on),ts}' --write --list-different",
     "tslint": "tslint -c tslint.json -p tsconfig.json './src/**/*.ts'",
-    "build": "tsc -p tsconfig.dist.json",
-    "build:all": "tsc -p tsconfig.json",
+    "typecheck": "tsc -p tsconfig.json",
+    "build:commonjs": "tsc -p tsconfig.dist.commonjs.json",
+    "build:module": "tsc -p tsconfig.dist.module.json",
+    "build": "tsc -p tsconfig.dist.commonjs.json && tsc -p tsconfig.dist.module.json",
     "test": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\"}' mocha --require ts-node/register --require source-map-support/register --opts mocha.opts",
     "cover": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\"}' nyc --require ts-node/register --require source-map-support/register --all mocha --opts mocha.opts --timeout 10000",
-    "watch": "tsc -p tsconfig.json -w",
-    "watch:build": "tsc -p tsconfig.dist.json -w",
+    "watch:typecheck": "tsc -p tsconfig.json -w",
+    "watch:build:commonjs": "tsc -p tsconfig.dist.commonjs.json -w",
+    "watch:build:module": "tsc -p tsconfig.dist.module.json -w",
+    "watch:build": "concurrently --kill-others 'npm:watch:build:*'",
     "watch:test": "npm run test -- -w",
     "watch:cover": "nodemon --watch src/ --ext ts,js,json --watch package.json --exec 'npm run cover || exit 1'"
   },
@@ -68,6 +74,7 @@
     "@types/node": "^10.5.0",
     "@types/uuid": "^3.4.3",
     "@types/ws": "^5.1.2",
+    "concurrently": "^3.6.0",
     "husky": "^0.14.3",
     "mocha": "^5.2.0",
     "nodemon": "^1.18.2",

package.json

@@ -0,0 +1,7 @@
+{
+  "extends": "./tsconfig.dist.json",
+  "compilerOptions": {
+    "module": "commonjs",
+    "outDir": "lib"
+  }
+}

tsconfig.dist.commonjs.json

@@ -0,0 +1,7 @@
+{
+  "extends": "./tsconfig.dist.json",
+  "compilerOptions": {
+    "module": "es6",
+    "outDir": "module"
+  }
+}

tsconfig.dist.module.json

@@ -2,11 +2,10 @@
   "extends": "./node_modules/@sourcegraph/tsconfig/tsconfig.json",
   "compilerOptions": {
     "target": "es2018",
-    "module": "es2015",
+    "module": "es6",
     "moduleResolution": "node",
     "sourceMap": true,
     "declaration": true,
-    "outDir": "lib",
     "noEmit": true,
     "lib": ["es2018"],
     "sourceRoot": "src",