Don’t warn by default

Author: andrewbranch

README.md

@@ -70,6 +70,7 @@ Add to your `gatsby-config.js` (all options are optional; defaults shown here):
           }) => '',
           extensionDataDirectory: // Absolute path to the directory where extensions will be downloaded. Defaults to inside node_modules.
             path.resolve('extensions'),
+          logLevel: 'error'       // Set to 'warn' to debug if something looks wrong
         }
       }]
     }

package-lock.json

@@ -49,6 +49,7 @@
     "json5": "^2.1.0",
     "lodash.escape": "^4.0.1",
     "lodash.uniq": "^4.5.0",
+    "loglevel": "^1.6.3",
     "oniguruma": "^7.2.0",
     "plist": "^3.0.1",
     "unist-util-visit": "^1.4.0",

package.json

@@ -1,6 +1,7 @@
 // @ts-check
 const fs = require('fs');
 const path = require('path');
+const logger = require('loglevel');
 const visit = require('unist-util-visit');
 const escapeHTML = require('lodash.escape');
 const lineHighlighting = require('./lineHighlighting');
@@ -20,14 +21,14 @@ const styles = fs.readFileSync(path.resolve(__dirname, '../styles.css'), 'utf8')
  * @param {string} rootScopeName
  */
 function warnMissingLanguageFile(missingScopeName, rootScopeName) {
-  console.warn(`No language file was loaded for scope '${missingScopeName}' (requested by '${rootScopeName}').`);
+  logger.warn(`No language file was loaded for scope '${missingScopeName}' (requested by '${rootScopeName}').`);
 }
 
 /**
  * @param {string} lang
  */
 function warnUnknownLanguage(lang) {
-  console.warn(
+  logger.warn(
     `Encountered unknown language '${lang}'. If '${lang}' is an alias for a supported language, ` +
       `use the 'languageAliases' plugin option to map it to the canonical language name.`
   );
@@ -120,6 +121,7 @@ function getStylesFromSettings(settings) {
  * @property {boolean=} injectStyles
  * @property {(colorValue: string, theme: string) => string=} replaceColor
  * @property {string=} extensionDataDirectory
+ * @property {'trace' | 'debug' | 'info' | 'warn' | 'error'=} logLevel
  */
 
 function createPlugin() {
@@ -140,9 +142,11 @@ function createPlugin() {
       getLineClassName = () => '',
       injectStyles = true,
       replaceColor = x => x,
-      extensionDataDirectory = path.resolve(__dirname, '../lib/extensions')
+      extensionDataDirectory = path.resolve(__dirname, '../lib/extensions'),
+      logLevel = 'error'
     } = {}
   ) {
+    logger.setLevel(logLevel);
     /** @type {Record<string, string>} */
     const stylesheets = {};
     const nodes = [];