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babel-plugin-transform-async-to-promises
Advanced tools
Readme
Babel plugin to transform async
functions containing await
expressions to the equivalent chain of Promise
calls with use of minimal helper functions.
async function fetchAsObjectURL(url) {
const response = await fetch(url);
const blob = await response.blob();
return URL.createObjectURL(blob);
}
const fetchAsObjectURL = _async(function(url) {
return _await(fetch(url), function(response) {
return _await(response.blob(), URL.createObjectURL);
});
});
hoist
enabled:function _response$blob(response) {
return _await(response.blob(), URL.createObjectURL);
}
const fetchAsObjectURL = _async(function(url) {
return _await(fetch(url), _response$blob);
});
inlineHelpers
enabled:const fetchAsObjectURL = function(url) {
try {
return Promise.resolve(fetch(url)).then(function(response) {
return Promise.resolve(response.blob()).then(URL.createObjectURL);
});
} catch(e) {
return Promise.reject(e);
}
}
externalHelpers
enabled:In the normal case, helpers are added to the top of the file for the _async
and _await
functions (as well as others). This can cause bloat in a codebase due to duplication of helper code in every file. To avoid this, enable externalHelpers
and those will be imported instead:
import { _async } from "babel-plugin-transform-async-to-promises/helpers";
import { _await } from "babel-plugin-transform-async-to-promises/helpers";
const fetchAsObjectURL = _async(function(url) {
return _await(fetch(url), function(response) {
return _await(response.blob(), URL.createObjectURL);
});
});
export default fetchAsObjectURL;
async
/await
for
/while
/do
loops (including loops that would exhaust stack if dispatched recursively)switch
statements (including fallthrough and default
cases)try
/catch
break
/continue
statements (on both loops and labeled statements)throw
expressionsarguments
this
Function.length
: async
functions will often return a length of 0 (when the _async
wrapper is used)topLevelAwait
option to return
when using SystemJS.eval
: impossible to support without deep hooks into the runtimeFunction.name
: rewrite pass removes function name instrumentationnew AsyncFunction(...)
: impossible to support without shipping babel and the plugin in the outputFAQs
Transform async/await to promise chains
The npm package babel-plugin-transform-async-to-promises receives a total of 300,747 weekly downloads. As such, babel-plugin-transform-async-to-promises popularity was classified as popular.
We found that babel-plugin-transform-async-to-promises 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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