bin/repl: handle missing should dependency

Dev dependencies are not available in production environments.

Closes getodk#1227

lib/bin/repl.js

@@ -7,18 +7,22 @@
 // including this file, may be copied, modified, propagated, or distributed
 // except according to the terms contained in the LICENSE file.
 
-const should = require('should'); // eslint-disable-line import/no-extraneous-dependencies
-require('../../test/assertions');
-
 const _ = require('lodash'); // eslint-disable-line import/no-extraneous-dependencies
 const { sql } = require('slonik');
 
 const container = require('../util/default-container');
 
 (async () => {
- const context = { ..._.omit(container, 'with'), container, should, sql };
- const contextKeys = Object.keys(context).sort();
- console.log('Available vars:', contextKeys.join(', '));
+ const context = { ..._.omit(container, 'with'), container, sql };
+ const contextKeys = Object.keys(context);
+
+ try {
+ context.should = require('should'); // eslint-disable-line import/no-extraneous-dependencies
+ contextKeys.push('should'); // manually add due to should.js prototype pollution
+ require('../../test/assertions');
+ } catch(err) { /* skip devDependencies if unavailable */ }
+
+ console.log('Available vars:', contextKeys.sort().join(', '));
 
  const repl = require('repl').start({
  useGlobal: true, // enable should.js prototype pollution