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[api-minor] Tweak the Node.js fake worker loader to prevent Critical dependency: ... warnings from Webpack

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Since bundlers, such as Webpack, cannot be told to leave `require` statements alone we are thus forced to jump through hoops in order to prevent these warnings in third-party deployments of the PDF.js library; please see [Webpack issue 8826](https://github.com/webpack/webpack) and libraries such as [require-fool-webpack](https://github.com/sindresorhus/require-fool-webpack).

*Please note:* This is based on the assumption that code running in Node.js won't ever be affected by e.g. Content Security Policies that prevent use of `eval`. If that ever occurs, we should revert to a normal `require` statement and simply document the Webpack warnings instead.
This commit is contained in:
Jonas Jenwald 2019-12-19 18:32:51 +01:00
parent 8519f87efb
commit d370037618
1 changed files with 16 additions and 2 deletions
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18
src/display/api.js
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@ -12,7 +12,6 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* globals __non_webpack_require__ */
/* eslint no-var: error */
/**
@ -1471,6 +1470,7 @@ const PDFWorker = (function PDFWorkerClosure() {
let fakeWorkerCapability;
if (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('GENERIC')) {
// eslint-disable-next-line no-undef
if (isNodeJS && typeof __non_webpack_require__ === 'function') {
// Workers aren't supported in Node.js, force-disabling them there.
isWorkerDisabled = true;
@ -1534,8 +1534,22 @@ const PDFWorker = (function PDFWorkerClosure() {
return worker.WorkerMessageHandler;
}
if ((typeof PDFJSDev !== 'undefined' && PDFJSDev.test('GENERIC')) &&
// eslint-disable-next-line no-undef
(isNodeJS && typeof __non_webpack_require__ === 'function')) {
const worker = __non_webpack_require__(getWorkerSrc());
// Since bundlers, such as Webpack, cannot be told to leave `require`
// statements alone we are thus forced to jump through hoops in order
// to prevent `Critical dependency: ...` warnings in third-party
// deployments of the built `pdf.js`/`pdf.worker.js` files; see
// https://github.com/webpack/webpack/issues/8826
//
// The following hack is based on the assumption that code running in
// Node.js won't ever be affected by e.g. Content Security Policies that
// prevent the use of `eval`. If that ever occurs, we should revert this
// to a normal `__non_webpack_require__` statement and simply document
// the Webpack warnings instead (telling users to ignore them).
//
// eslint-disable-next-line no-eval
const worker = eval('require')(getWorkerSrc());
return worker.WorkerMessageHandler;
}
await loadScript(getWorkerSrc());