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/ answers: 1 / hits: 5431
/ 6 Years ago, mon, june 4, 2018, 12:00:00
Premise
We've got handlebars running in a backend nodejs application for templating various messages that get sent.
Handlebars.compile throws this exception (when compiling templates from partials)
Error: You must pass a string or Handlebars AST to Handlebars.compile. You passed <html>
<head>
... extremely long markup
at Object.compile (/Users/guscrawford/rollick-management-console/deployd/node_modules/handlebars/dist/cjs/handlebars/compiler/compiler.js:501:11)
at HandlebarsEnvironment.hb.compile (/Users/guscrawford/rollick-management-console/deployd/node_modules/handlebars/dist/cjs/handlebars.js:39:40)
at Object.invokePartialWrapper [as invokePartial] (/Users/guscrawford/rollick-management-console/deployd/node_modules/handlebars/dist/cjs/handlebars/runtime.js:71:44)
... additional stack trace through to dpd, bluebird etc.
Cannot replicate through isolation
Go ahead and try setting up a scrap project:
yarn add handlebars handlebars-helper-ternary handlebars-helpers handlebars.numeral
Then run this script in nodejs:
const handlebars = require('handlebars'),
numeralHelper = require('handlebars.numeral'),
ternaryHelper = require('handlebars-helper-ternary'),
helpers = require('handlebars-helpers')({
handlebars: handlebars
});
console.log(`Testing...`);
const base = `
<html>
<body style=font-family:'Segoe UI', Tahoma, Geneva, Verdana, 'sans-serif'; font-size: larger;>
{{>@partial-block }}
<td style=text-align: center; padding: 24px;>
Copyright 2018 My Company, Inc. All rights reserved.
</body>
</html>
`;
const inner = `
{{#>base}}
{{subscriber.name}},
{{member.name}} has received a notifier from {{subscriber.name}}.
Click the link below to review!.
<a href='{{link}}'>Go!</a>
Thank you,
My Company
{{/base}}
`;
numeralHelper.registerHelpers(handlebars);
handlebars.registerHelper('ternary', ternaryHelper);
handlebars.registerHelper(moduloIf, function (index_count, mod, block) {
if (index_count > 0 && parseInt(index_count) % (mod) === 0) {
return block.fn(this);
} else {
return block.inverse(this);
}
});
handlebars.registerHelper(substitute, function(a, options) {
try {
function index(obj,i) { return obj ? obj[i] : {} }
let data = a.split('.').reduce(index, this);
if (data && typeof data === 'string') return data;
else return options.fn(this);
} catch (e) {
console.log('substitute helper:' + e);
}
});
handlebars.registerPartial('base',base)
var output = handlebars.compile(inner)({name:'Gus'});
console.log('Output:');
console.log(output)
Further consideration
In actuality we have the handlebars require wrapped in another module with code run against the handlebars instance as illustrated in the sample script. We're exporting the handlebars instance.
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