add build and lint processes

.eslintrc.yaml

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+env:
+  es6: true
+  browser: true
+plugins:
+  - html
+extends: 'eslint:recommended'
+parserOptions:
+  ecmaVersion: 2017
+  sourceType: module

.gitignore

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+/node_modules/
+/dist/

package.json

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+{
+	"scripts": {
+		"build": "rollup -c",
+		"lint": "eslint src rollup.config.js --ext .js,.html"
+	},
+	"devDependencies": {
+		"eslint": "^4.1.1",
+		"eslint-plugin-html": "^3.0.0",
+		"rollup": "^0.43.0",
+		"rollup-plugin-svelte": "^2.0.2"
+	}
+}

rollup.config.js

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+import svelte from 'rollup-plugin-svelte'
+
+export default {
+	entry: './src/index.js',
+	sourceMap: true,
+	plugins: [ svelte() ],
+	targets: [
+		{ dest: './dist/index.cjs.js', format: 'cjs' },
+		{ dest: './dist/index.es.js', format: 'es' },
+	],
+}