feat: Allow environment variables to override config values

src/lib/config.ts

@@ -52,7 +52,7 @@ if (!config.org && org) {
 // invalid (non-numeric) value will fallback to the default
 const timeout = userConfig.get('timeout');
 if (!config.timeout) {
-  config.timeout = +timeout ? +timeout : DEFAULT_TIMEOUT;
+  config.timeout = timeout && +timeout ? +timeout : DEFAULT_TIMEOUT;
 }
 
 // this is a bit of an assumption that our web site origin is the same

src/lib/user-config.ts

@@ -1,3 +1,16 @@
 const Configstore = require('configstore');
 const pkg = require(__dirname + '/../../package.json');
-export const config = new Configstore(pkg.name);
+
+class ConfigStoreWithEnvironmentVariables extends Configstore {
+  constructor(id, defaults = undefined, options = {}) {
+    super(id, defaults, options);
+  }
+
+  public get(key: string): string | undefined {
+    const envKey = `SNYK_CFG_${key.replace(/-/g, '_').toUpperCase()}`;
+    const envValue = process.env[envKey];
+    return super.has(key) && !envValue ? String(super.get(key)) : envValue;
+  }
+}
+
+export const config = new ConfigStoreWithEnvironmentVariables(pkg.name);