diff --git a/.gitignore b/.gitignore
index 7f9f6e9..694e84e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
+favicon.ico
+
 data/
 dist/
 bundle/
diff --git a/examples/country-index.html b/examples/country-index.html
index aa6d0f0..f4891e1 100644
--- a/examples/country-index.html
+++ b/examples/country-index.html
@@ -41,19 +41,19 @@
 let countries = d3.geomap()
     .geofile('../dist/topojson/world/countries.json')
     .postUpdate(drawCountries);
-let container = d3.select('#main');
+const container = d3.select('#main');
 
 countries.draw(container);
 container.selectAll('*').remove();
 
 function drawCountries() {
     for (let geometry of countries.geo.objects.units.geometries) {
-        let map_container = container.append('div')
+        const map_container = container.append('div')
             .attr('id', geometry.properties.iso3)
             .attr('class', 'country');
         map_container.append('h2').text(geometry.properties.name);
 
-        let country = d3.geomap()
+        const country = d3.geomap()
             .geofile(`../dist/topojson/countries/${geometry.properties.iso3}.json`)
             .postUpdate(_ => map_container.select('path').dispatch('click'));
 
diff --git a/rollup.config.js b/rollup.config.js
index b5e5e34..df11f7c 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -2,7 +2,7 @@ import postcss from 'rollup-plugin-postcss';
 import babel from '@rollup/plugin-babel';
 import terser from '@rollup/plugin-terser';
 
-import meta from './package.json' assert { type: "json" };
+import meta from './package.json' assert { type: 'json' };
 
 
 function makeCssConfig({ minimize = false } = {}) {