Async Execution

By default, templates are compiled to be executed synchronously, but Moe-js can also build an async template function that returns a Promise. This lets you use await statements within the template itself. To compile an async template, pass either true or { asyncTemplate: true } as the second parameter to any of the compile functions.

// Compile an async template (Note use of "await model.promise")
let template = moe.compile(`Promise result:  {{await model.promise}}`, {
    asyncTemplate: true     // Indicates we want an async template
});

// Create a simple promise that delivers a string
let promise = new Promise((resolve, reject) => {
    setTimeout(() => resolve("Hello"), 1000);
});

// Execute the template (Note use of "await" on the template function)
let result = await template({
    promise: promise,
});

assert(result == "Promise result: Hello");

Note: don't confuse async templates with the moe.compileFileAsync function:

• moe.compileFileAsync returns a promise for the compiled template function.
• options.asyncTemplate allow the use of await within the template itself.