It appears that the repository has undergone several changes and renamings:

backend/node_modules/yaml/dist/log.js

@@ -1,19 +0,0 @@
-'use strict';
-
-var node_process = require('process');
-
-function debug(logLevel, ...messages) {
-    if (logLevel === 'debug')
-        console.log(...messages);
-}
-function warn(logLevel, warning) {
-    if (logLevel === 'debug' || logLevel === 'warn') {
-        if (typeof node_process.emitWarning === 'function')
-            node_process.emitWarning(warning);
-        else
-            console.warn(warning);
-    }
-}
-
-exports.debug = debug;
-exports.warn = warn;