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Use optional chaining in web/pdf_history.js

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Since we're now free to use e.g. optional chaining everywhere *except* for the worker, we can thus simplify this code a bit.
This commit is contained in:
Jonas Jenwald 2020-10-31 11:24:39 +01:00
parent 911948c5c0
commit 322b1072af
1 changed files with 6 additions and 8 deletions
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14
web/pdf_history.js
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@ -290,7 +290,7 @@ class PDFHistory {
return;
}
if (this._destination && this._destination.page === pageNumber) {
if (this._destination?.page === pageNumber) {
// When the new page is identical to the one in `this._destination`, we
// don't want to add a potential duplicate entry in the browser history.
return;
@ -388,8 +388,7 @@ class PDFHistory {
if (
typeof PDFJSDev !== "undefined" &&
PDFJSDev.test("CHROME") &&
window.history.state &&
window.history.state.chromecomState
window.history.state?.chromecomState
) {
// history.state.chromecomState is managed by chromecom.js.
newState.chromecomState = window.history.state.chromecomState;
@ -397,7 +396,7 @@ class PDFHistory {
this._updateInternalState(destination, newState.uid);
let newUrl;
if (this._updateUrl && destination && destination.hash) {
if (this._updateUrl && destination?.hash) {
const baseUrl = document.location.href.split("#")[0];
// Prevent errors in Firefox.
if (!baseUrl.startsWith("file://")) {
@ -494,7 +493,7 @@ class PDFHistory {
return false;
}
const [perfEntry] = performance.getEntriesByType("navigation");
if (!perfEntry || perfEntry.type !== "reload") {
if (perfEntry?.type !== "reload") {
return false;
}
} else {
@ -523,7 +522,7 @@ class PDFHistory {
clearTimeout(this._updateViewareaTimeout);
this._updateViewareaTimeout = null;
}
if (removeTemporary && destination && destination.temporary) {
if (removeTemporary && destination?.temporary) {
// When the `destination` comes from the browser history,
// we no longer treat it as a *temporary* position.
delete destination.temporary;
@ -633,8 +632,7 @@ class PDFHistory {
if (
(typeof PDFJSDev !== "undefined" &&
PDFJSDev.test("CHROME") &&
state &&
state.chromecomState &&
state?.chromecomState &&
!this._isValidState(state)) ||
!state
) {