Make elm a peer dependency.

appveyor.yml

@@ -26,5 +26,6 @@ test_script:
  - node --version
  - npm --version
  - npm install
+ - npm install elm elm-test
  - npm link
  - npm run test

bin/create-elm-app-cli.js

@@ -6,7 +6,9 @@ const path = require('path');
 const spawn = require('cross-spawn');
 const argv = require('minimist')(process.argv.slice(2));
 const version = require('../package.json').version;
-const elmVersion = require('elm/package.json').version;
+const which = require('which');
+const elmExecutable = which.sync('elm', {nothrow: true}) || require.resolve('elm/bin/elm');
+const elmVersion = spawn.sync(elmExecutable, ['--version']).stdout.toString().trim();
 const commands = argv._;
 
 if (commands.length === 0) {

bin/elm-app-cli.js

@@ -5,9 +5,11 @@
 const path = require('path');
 const spawn = require('cross-spawn');
 const argv = require('minimist')(process.argv.slice(2));
-const elmExecutable = require.resolve('elm/bin/elm');
+const which = require('which');
+const elmExecutable = which.sync('elm', {nothrow: true}) || require.resolve('elm/bin/elm');
+const elmTestExecutable = which.sync('elm-test', {nothrow: true}) || require.resolve('elm-test/bin/elm-test');
 const version = require('../package.json').version;
-const elmVersion = require('elm/package.json').version;
+const elmVersion = spawn.sync(elmExecutable, ['--version']).stdout.toString().trim();
 
 const commands = argv._;
 
@@ -66,8 +68,8 @@ switch (script) {
  }
  });
 
- args = args.concat(['--compiler', require.resolve('elm/bin/elm')]);
- const cp = spawn.sync(require.resolve('elm-test/bin/elm-test'), args, {
+ args = args.concat(['--compiler', elmExecutable]);
+ const cp = spawn.sync(elmTestExecutable, args, {
  stdio: 'inherit'
  });
 

config/paths.js

@@ -4,6 +4,7 @@ const path = require('path');
 const fs = require('fs');
 const url = require('url');
 const cosmiconfig = require('cosmiconfig');
+const which = require('which');
 
 // Make sure any symlinks in the project folder are resolved:
 // https://github.com/facebookincubator/create-react-app/issues/637
@@ -76,7 +77,7 @@ module.exports = {
  entry: resolveApp('./src/index.js'),
  appBuild: resolveApp('./build'),
  elmJson: resolveApp('./elm.json'),
- elm: require.resolve('elm/bin/elm'),
+ elm: which.sync('elm', {nothrow: true}) || require.resolve('elm/bin/elm'),
  publicUrl: getPublicUrl(config),
  servedPath: getServedPath(config),
  proxy: config.proxy,

package.json

@@ -35,10 +35,8 @@
  "cross-spawn": "7.0.3",
  "css-loader": "4.3.0",
  "dotenv": "8.2.0",
- "elm": "latest-0.19.1",
  "elm-asset-webpack-loader": "1.1.2",
  "elm-hot-webpack-loader": "1.1.7",
- "elm-test": "latest-0.19.1",
  "elm-webpack-loader": "6.0.1",
  "file-loader": "6.2.0",
  "fs-extra": "6.0.1",
@@ -65,6 +63,7 @@
  "webpack-dev-server": "3.11.0",
  "webpack-manifest-plugin": "2.2.0",
  "whatwg-fetch": "3.5.0",
+ "which": "^2.0.2",
  "workbox-webpack-plugin": "4.3.1"
  },
  "devDependencies": {
@@ -87,6 +86,10 @@
  "shelljs": "0.8.3",
  "unexpected": "12.0.0"
  },
+ "peerDependencies": {
+ "elm": "^0.19.1",
+ "elm-test": "^0.19.1"
+ },
  "engines": {
  "node": ">=8.0.0"
  },

scripts/create.js

@@ -7,6 +7,7 @@ const chalk = require('chalk');
 const spawn = require('cross-spawn');
 const argv = require('minimist')(process.argv.slice(2));
 const commands = argv._;
+const elmExecutable = which.sync('elm', {nothrow: true}) || require.resolve('elm/bin/elm');
 
 const isWindows = process.platform === 'win32';
 
@@ -44,7 +45,7 @@ function createElmApp(name) {
 
  // Run initial `elm make`
  const spawnElmPkgResult = spawn.sync(
- path.resolve(__dirname, '../node_modules/.bin/elm'),
+ elmExecutable,
  // Run elm-make to install the dependencies.
  ['make', 'src/Main.elm', '--output=/dev/null'],
  { stdio: 'inherit', cwd: appRoot }