From 4021492797d4938d36feef3293c947835e9aa53d Mon Sep 17 00:00:00 2001
From: Dan Stillman <dstillman@zotero.org>
Date: Tue, 17 Aug 2021 00:40:06 -0400
Subject: [PATCH] Babel: Add support for optional chaining

https://babeljs.io/docs/en/babel-plugin-proposal-optional-chaining
---
 .babelrc          |  1 +
 package-lock.json | 55 +++++++++++++++++++++++++++++++++++++++++++++++
 package.json      |  1 +
 3 files changed, 57 insertions(+)

diff --git a/.babelrc b/.babelrc
index 12a688aea5..232a7b4ee4 100644
--- a/.babelrc
+++ b/.babelrc
@@ -17,6 +17,7 @@
   "plugins": [
     "@babel/plugin-proposal-class-properties",
     "@babel/plugin-proposal-object-rest-spread",
+    "@babel/plugin-proposal-optional-chaining",
     [
       "transform-es2015-modules-commonjs",
       {
diff --git a/package-lock.json b/package-lock.json
index 723f7079f5..ba6ab1be7c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -326,6 +326,33 @@
         "@babel/types": "^7.12.1"
       }
     },
+    "@babel/helper-skip-transparent-expression-wrappers": {
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/helper-skip-transparent-expression-wrappers/-/helper-skip-transparent-expression-wrappers-7.14.5.tgz",
+      "integrity": "sha512-dmqZB7mrb94PZSAOYtr+ZN5qt5owZIAgqtoTuqiFbHFtxgEcmQlRJVI+bO++fciBunXtB6MK7HrzrfcAzIz2NQ==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.14.5"
+      },
+      "dependencies": {
+        "@babel/helper-validator-identifier": {
+          "version": "7.14.9",
+          "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.14.9.tgz",
+          "integrity": "sha512-pQYxPY0UP6IHISRitNe8bsijHex4TWZXi2HwKVsjPiltzlhse2znVcm9Ace510VT1kxIHjGJCZZQBX2gJDbo0g==",
+          "dev": true
+        },
+        "@babel/types": {
+          "version": "7.15.0",
+          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.15.0.tgz",
+          "integrity": "sha512-OBvfqnllOIdX4ojTHpwZbpvz4j3EWyjkZEdmjH0/cgsd6QOdSgU8rLSk6ard/pcW7rlmjdVSX/AWOaORR1uNOQ==",
+          "dev": true,
+          "requires": {
+            "@babel/helper-validator-identifier": "^7.14.9",
+            "to-fast-properties": "^2.0.0"
+          }
+        }
+      }
+    },
     "@babel/helper-split-export-declaration": {
       "version": "7.11.0",
       "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.11.0.tgz",
@@ -388,6 +415,25 @@
         "@babel/plugin-transform-parameters": "^7.12.1"
       }
     },
+    "@babel/plugin-proposal-optional-chaining": {
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-optional-chaining/-/plugin-proposal-optional-chaining-7.14.5.tgz",
+      "integrity": "sha512-ycz+VOzo2UbWNI1rQXxIuMOzrDdHGrI23fRiz/Si2R4kv2XZQ1BK8ccdHwehMKBlcH/joGW/tzrUmo67gbJHlQ==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-plugin-utils": "^7.14.5",
+        "@babel/helper-skip-transparent-expression-wrappers": "^7.14.5",
+        "@babel/plugin-syntax-optional-chaining": "^7.8.3"
+      },
+      "dependencies": {
+        "@babel/helper-plugin-utils": {
+          "version": "7.14.5",
+          "resolved": "https://registry.npmjs.org/@babel/helper-plugin-utils/-/helper-plugin-utils-7.14.5.tgz",
+          "integrity": "sha512-/37qQCE3K0vvZKwoK4XU/irIJQdIfCJuhU5eKnNxpFDsOkgFaUAwbv+RYw6eYgsC0E4hS7r5KqGULUogqui0fQ==",
+          "dev": true
+        }
+      }
+    },
     "@babel/plugin-syntax-jsx": {
       "version": "7.12.1",
       "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-jsx/-/plugin-syntax-jsx-7.12.1.tgz",
@@ -406,6 +452,15 @@
         "@babel/helper-plugin-utils": "^7.8.0"
       }
     },
+    "@babel/plugin-syntax-optional-chaining": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-optional-chaining/-/plugin-syntax-optional-chaining-7.8.3.tgz",
+      "integrity": "sha512-KoK9ErH1MBlCPxV0VANkXW2/dw4vlbGDrFgz8bmUsBGYkFRcbRwMh6cIJubdPrkxRwuGdtCk0v/wPTKbQgBjkg==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-plugin-utils": "^7.8.0"
+      }
+    },
     "@babel/plugin-transform-parameters": {
       "version": "7.12.1",
       "resolved": "https://registry.npmjs.org/@babel/plugin-transform-parameters/-/plugin-transform-parameters-7.12.1.tgz",
diff --git a/package.json b/package.json
index 2f3dd2cb09..5cfb2d500f 100644
--- a/package.json
+++ b/package.json
@@ -31,6 +31,7 @@
     "@babel/core": "^7.4.0",
     "@babel/plugin-proposal-class-properties": "^7.4.0",
     "@babel/plugin-proposal-object-rest-spread": "^7.4.0",
+    "@babel/plugin-proposal-optional-chaining": "^7.14.5",
     "@babel/preset-react": "^7.0.0",
     "@zotero/eslint-config": "^1.0.6",
     "babel-eslint": "^10.0.1",