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Add support for async/await using Babel

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For proof-of-concept, this patch converts a couple of `Promise` returning methods to use `async` instead.
Please note that the `generic` build, based on this patch, has been successfully testing in IE11 (i.e. the viewer loads and nothing is obviously broken).

Being able to use modern JavaScript features like `async`/`await` is a huge plus, but there's one (obvious) side-effect: The size of the built files will increase slightly (unless `SKIP_BABEL == true`). That's unavoidable, but seems like a small price to pay in the grand scheme of things.

Finally, note that the `chromium` build target was changed to no longer skip Babel translation, since the Chrome extension still supports version `49` of the browser (where native `async` support isn't available).
This commit is contained in:
Jonas Jenwald 2018-07-30 13:58:09 +02:00
parent 4ea663aa8a
commit 099ed08852
13 changed files with 159 additions and 179 deletions
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20
src/core/evaluator.js
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@ -131,19 +131,17 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
this.options = options || DefaultPartialEvaluatorOptions;
this.pdfFunctionFactory = pdfFunctionFactory;
this.fetchBuiltInCMap = (name) => {
this.fetchBuiltInCMap = async (name) => {
if (this.builtInCMapCache.has(name)) {
return Promise.resolve(this.builtInCMapCache.get(name));
return this.builtInCMapCache.get(name);
}
return this.handler.sendWithPromise('FetchBuiltInCMap', {
name,
}).then((data) => {
if (data.compressionType !== CMapCompressionType.NONE) {
// Given the size of uncompressed CMaps, only cache compressed ones.
this.builtInCMapCache.set(name, data);
}
return data;
});
const data = await this.handler.sendWithPromise('FetchBuiltInCMap',
{ name, });
if (data.compressionType !== CMapCompressionType.NONE) {
// Given the size of uncompressed CMaps, only cache compressed ones.
this.builtInCMapCache.set(name, data);
}
return data;
};
}