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async-off
: make asynchronous TypeScript code synchronousUsing without installation:
npx async-off path/to/file.ts
Installation:
npm install -g async-off
async-off path/to/file.ts
cat path/to/file.ts | async-off
async-off --help
async-off -h
async-off
converts asynchronous TypeScript code to synchronous code by:
await
in expressions and in for-await-of
loops.async
.Promise<X>
to X
.AsyncIterable<X>
to Iterable<X>
and AsyncIterator<X>
to Iterator<X>
.More changes can be configured (see below).
async-off
’s approach only works for very simple code. Then you can avoid writing very similar code twice – once asynchronously and once synchronously. Examples of such code include:
map()
, filter()
, etc. (see next section)Input:
async function* map<In, Out>(
mapperFn: (x: In) => Out,
iterable: AsyncOrSyncIterable<In>
): AsyncIterable<Out> {
for await (const x of iterable) {
yield mapperFn(x);
}
}
//<async>
type AsyncOrSyncIterable<Item> = AsyncIterable<Item> | Iterable<Item>;
//</async>
//<async-off-config>
// {
// "renameType": {
// "AsyncOrSyncIterable": "Iterable"
// }
// }
//</async-off-config>
Output:
function* map<In, Out>(
mapperFn: (x: In) => Out,
iterable: Iterable<In>
): Iterable<Out> {
for (const x of iterable) {
yield mapperFn(x);
}
}
async-off
is configured via embedded JSON (see previous section). The following properties are supported:
interface ConfigJson {
/**
* Removes a function call wrapped around a value.
* Use case – unit testing:
*
* ```ts
* processAsyncData(toAsyncIterable(['a', 'b', 'c']));
* processSyncData(['a', 'b', 'c']);
* ```
*
* Note: (processAsyncData() is renamed separately.)
*/
unwrapFunctionCall?: Array<string>;
/**
* Included by default: `"Promise"`
*/
unwrapParamerizedType?: Array<string>;
renameVariable?: Record<string, string>;
/**
* Included by default: `{"AsyncIterable": "Iterable", "AsyncIterator": "Iterator"}`
*/
renameType?: Record<string, string>;
}
const Functions = {
map,
filter,
};
//<async>
export {Functions as AsyncIterable};
//</async>
//<sync>
// export {Functions as Iterable};
//</sync>
async-off
uses the library ts-morph
FAQs
Make asynchronous TypeScript code synchronous
The npm package async-off receives a total of 1 weekly downloads. As such, async-off popularity was classified as not popular.
We found that async-off demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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