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The term “syntactic sugar” is tricky. Common definition: shorter syntax with a simple transformation to a longer version. Think syntax-aware search-and-replace or macros.

Examples:

a += b // sugar
a = a + b // long

{prop} // sugar
{prop: prop} // long

(x) => x + x // sugar
(x) => { return x } // long

With this definition, async/await is not syntactic sugar for Promises: An async function is executed similarly to a generator (pausing, resuming, …). So no simple transformation from .then().