[3235] lodash works perfectly at initial load, however when I refresh I get this error "_ is not defined"

lodash works perfectly at initial load, however when I refresh I get thiserror "_ is not defined"

I added loadash as a plugin to my project, and used the .debounce function which works perfectly when loading the page for the first time, but when i refresh the page I get this error " is not defined"

submit:_.debounce(function(){ this.searchString = 'searching..................' if (this.searchValue !== '' ) { this.$router.push(${this.searchValue}) console.log(this.$nuxt.$route.path) } }, 3000)