Add transpiled ES Module build with microbundle

- Export EPSG codes everywhere, so they can be accessed as .code instead of .default
- Set up index.js that imports and exports EPSG_*
- Add build target using microbundle

See geoblocks/base#4

package.json

@@ -2,7 +2,11 @@
   "name": "@geoblocks/proj",
   "version": "0.3.0",
   "description": "Geoblocks projections",
+  "main": "dist/proj.js",
+  "module": "dist/proj.js",
+  "source": "src/index.js",
   "scripts": {
+    "build": "microbundle --format es",
     "eslint": "eslint src/*.js",
     "typecheck": "tsc --pretty",
     "lint": "npm run eslint && npm run typecheck",
@@ -26,6 +30,7 @@
     "babel-core": ">=7.0.0-bridge.0",
     "babel-jest": ">=23.6.0",
     "jest": ">=23.6.0",
+    "microbundle": "^0.9.0",
     "ol": ">=5.3.0",
     "proj4": ">=2.5.0",
     "typedoc": ">=0.13.0",

src/EPSG_2056.js

@@ -4,7 +4,7 @@
 import somerc from './somerc.js';
 import {create} from './utils.js';
 
-const code = 'EPSG:2056';
+export const code = 'EPSG:2056';
 
 const def = `
   +proj=${somerc}

src/EPSG_2154.js

@@ -4,7 +4,7 @@
 import lcc from './lcc.js';
 import {create} from './utils.js';
 
-const code = 'EPSG:2154';
+export const code = 'EPSG:2154';
 
 const def = `
   +proj=${lcc}

src/EPSG_21781.js

@@ -4,7 +4,7 @@
 import somerc from './somerc.js';
 import {create} from './utils.js';
 
-const code = 'EPSG:21781';
+export const code = 'EPSG:21781';
 
 const def = `
   +proj=${somerc}

src/EPSG_27572.js

@@ -4,7 +4,7 @@
 import lcc from './lcc.js';
 import {create} from './utils.js';
 
-const code = 'EPSG:27572';
+export const code = 'EPSG:27572';
 
 const def = `
   +proj=${lcc}

src/EPSG_32631.js

@@ -4,7 +4,7 @@
 import utm from './utm.js';
 import {create} from './utils.js';
 
-const code = 'EPSG:32631';
+export const code = 'EPSG:32631';
 
 const def = `
   +proj=${utm}

src/EPSG_3947.js

@@ -4,7 +4,7 @@
 import lcc from './lcc.js';
 import {create} from './utils.js';
 
-const code = 'EPSG:3947';
+export const code = 'EPSG:3947';
 
 const def = `
   +proj=${lcc}

src/index.js

@@ -0,0 +1,15 @@
+import * as EPSG_2056 from './EPSG_2056';
+import * as EPSG_2154 from './EPSG_2154';
+import * as EPSG_3947 from './EPSG_3947';
+import * as EPSG_21781 from './EPSG_21781';
+import * as EPSG_27572 from './EPSG_27572';
+import * as EPSG_32631 from './EPSG_32631';
+
+export {
+  EPSG_2056,
+  EPSG_2154,
+  EPSG_3947,
+  EPSG_21781,
+  EPSG_27572,
+  EPSG_32631,
+};