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denoland-deno/cli/tests/015_duplicate_parallel_import.js

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2019-08-07 12:55:39 -04:00
// Importing the same module in parallel, the module should only be
// instantiated once.
const promises = new Array(100)
.fill(null)
.map(() => import("./subdir/mod1.ts"));
Promise.all(promises).then((imports) => {
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const mod = imports.reduce((first, cur) => {
if (typeof first !== "object") {
throw new Error("Expected an object.");
}
if (first !== cur) {
throw new Error("More than one instance of the same module.");
}
return first;
});
mod.printHello3();
});