我们在后端nodejs应用程序中运行了把手，用于模板化发送的各种消息。
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.
继续尝试设置废料项目：
yarn add handlebars handlebars-helper-ternary handlebars-helpers handlebars.numeral
然后在nodejs中运行此脚本：
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)
实际上，我们将把手require包装在另一个模块中，代码针对把手实例运行，如示例脚本所示。我们正在导出把手实例。
答案 0 :(得分：1)
尽管我将作为字符串传递的模板字符串记录为typeof，但readFileAsync的输出未传递编码是原始节点缓冲区。
<强>咄
答案 1 :(得分：0)
错误很明显，你传递的不是字符串或AST。
This是把手抛出该错误的唯一方法。
if (input == null || (typeof input !== 'string' && input.type !== 'Program')) {
throw new Exception('You must pass a string or Handlebars AST to Handlebars.compile. You passed ' + input);
}
您可能会使用object方法传递toString，这就是您看到的原因：
You passed <html>
<head>
... extremely long markup
const input = {
toString() {
return `<html>
<head>`;
}
}
console.log('You must pass a string or Handlebars AST to Handlebars.compile. You passed ' + input);