Convert to ES modules and related changes

src/settings.js

@@ -2,7 +2,7 @@
 // Order is preserved. If a field has an empty value, it will not be included. You can rename a
 // field by providing an alias after a ':'. For example, 'date:created' will include 'date' in
 // frontmatter, but renamed to 'created'.
-exports.frontmatter_fields = [
+export const frontmatter_fields = [
 	'title',
 	'date',
 	'categories',
@@ -12,29 +12,29 @@ exports.frontmatter_fields = [
 
 // Time in ms to wait between requesting image files. Increase this if you see timeouts or
 // server errors.
-exports.image_file_request_delay = 500;
+export const image_file_request_delay = 500;
 
 // Time in ms to wait between saving Markdown files. Increase this if your file system becomes
 // overloaded.
-exports.markdown_file_write_delay = 25;
+export const markdown_file_write_delay = 25;
 
 // Enable this to include time with post dates. For example, "2020-12-25" would become
 // "2020-12-25T11:20:35.000Z".
-exports.include_time_with_date = false;
+export const include_time_with_date = false;
 
 // Override post date formatting with a custom formatting string (for example: 'yyyy LLL dd').
 // Tokens are documented here: https://moment.github.io/luxon/#/parsing?id=table-of-tokens. If
 // set, this takes precedence over include_time_with_date.
-exports.custom_date_formatting = '';
+export const custom_date_formatting = '';
 
 // Specify the timezone used for post dates. See available zone values and examples here:
 // https://moment.github.io/luxon/#/zones?id=specifying-a-zone.
-exports.custom_date_timezone = 'utc';
+export const custom_date_timezone = 'utc';
 
 // Categories to be excluded from post frontmatter. This does not filter out posts themselves,
 // just the categories listed in their frontmatter.
-exports.filter_categories = ['uncategorized'];
+export const filter_categories = ['uncategorized'];
 
 // Strict SSL is enabled as the safe default when downloading images, but will not work with
 // self-signed servers. You can disable it if you're getting a "self-signed certificate" error.
-exports.strict_ssl = true;
+export const strict_ssl = true;