Add script to generate JSON files

Borrowed from WooCommerce Admin plugin.

bin/make-i18n-json.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+# Check for required version
+WPCLI_VERSION=`wp cli version | cut -f2 -d' '`
+if [ ${WPCLI_VERSION:0:1} -lt "2" -o ${WPCLI_VERSION:0:1} -eq "2" -a ${WPCLI_VERSION:2:1} -lt "1" ]; then
+	echo WP-CLI version 2.1.0 or greater is required to make JSON translation files
+	exit
+fi
+
+# Substitute JS source references with build references
+# For new rules, duplicate the line `-e ...`
+for T in `find lang -name "*.po"`
+	do
+		sed \
+			-e 's/ assets\/onboarding[^:]*:/ assets\/dist\/onboarding\/index.js:/gp' \
+			$T | uniq > $T-build
+		rm $T
+		mv $T-build $T
+	done
+
+# Make the JSON files
+wp i18n make-json lang --no-purge

package.json

@@ -53,6 +53,7 @@
     "i18n:js": "npx babel --config-file ./babel.makepot.js -o ./lang/tmp-babel.log assets --ignore \"**/*.test.js\",\"./assets/dist\",\"./assets/vendor\"",
     "i18n:php": "wp i18n make-pot --merge=lang/tmp-sensei-lms-js.pot --skip-js --headers='{\"Last-Translator\":null,\"Language-Team\":null}' . lang/sensei-lms.pot",
     "i18n:build": "npm run i18n:clean && npm run i18n:js && npm run i18n:php && node ./bin/replace-pot-jsx-js && npm run i18n:clean",
+    "i18n:json": "./bin/make-i18n-json.sh",
     "format-js": "wp-scripts format-js",
     "lint-css": "wp-scripts lint-style **/*.scss",
     "lint-css:fix": "npm run lint-css -- --fix",