Initial commit

lib/loadConfig.js

@@ -0,0 +1,43 @@
+module.exports = (opts, envKey) => {
+	const
+		fs = require('fs'),
+		path = require('path'),
+
+		json5 = require('json5'),
+
+		{ convertCamelToUpperSnakeCase, readJsonIfExists } = require('./utils'),
+
+		{ cwd, env } = process,
+
+		def = readJsonIfExists(path.resolve(__dirname, 'defaults.json5')),
+
+		// gets value from ENV || options || defaults (in that order)
+		getVal = (envName) => {
+			const snakeEnvName = `${envKey}_${convertCamelToUpperSnakeCase(envName)}`;
+			if (env[snakeEnvName]) return env[snakeEnvName];
+			if (opts[envName]) return opts[envName];
+			return def[envName];
+		},
+
+		// gets array from ENV || options || defaults (in that order)
+		getArray = (envName, optName = '') => {
+			if (optName === '') {
+				optName = envName;
+				envName = convertCamelToUpperSnakeCase(envName);
+			}
+			envName = `${envKey}_${envName}`;
+			if (env[envName]) return env[envName].split(path.delimiter);
+			if (Array.isArray(opts[optName]) && opts[optName].length) return opts[optName];
+			return def[optName];
+		};
+
+		
+	return {
+
+		...Object.keys(def).reduce((acc, curr) => {
+			if (Array.isArray(def[curr])) acc[curr] = getArray(curr);
+			else acc[curr] = getVal(curr);
+			return acc;
+		}, {}),
+	};
+};