The code in main.js includes the following:
window.l = function () { }
try {
window.l = console.log.bind(console)
} catch (e) { }
It functions properly in non-Vue applications. However, when trying to use it in a Vue action/method like this:
l("test")
an error is thrown stating that it is undefined.
How can this be resolved?
The purpose behind this is to easily output debugging information with minimal typing required.
When looking to enhance Vue with global-level functionalities, it is recommended to utilize mixins or plugins.
In the following examples, assuming you are utilizing vue-cli with the complete webpack template. The reference point will be App.vue, but the same principles can be applied to other components...
Create a mixin called log.js (within a folder named mixins) with this code:
export default {
methods: {
l (...args) { // rest parameters
console.log(...args) // spread operator
}
}
}
In App.vue, import the mixin and use it:
<script>
import log from './mixins/log'
export default {
name: 'app',
mixins: [log],
created () {
this.l('Foo', 'Bar') // Foo Bar
}
}
</script>
Create a plugin named log.js (within a folder named plugins) with the following code:
export default {
install (Vue, options) {
Vue.prototype.$l = console.log.bind(console)
Vue.l = console.log.bind(console)
}
}
In your main.js, declare your global plugin:
import log from './plugins/log'
Vue.use(log)
In App.vue, import Vue and use the plugin:
<script>
import Vue from 'vue'
export default {
name: 'app',
created () {
this.$l('Foo') // Foo
Vue.l('Bar') // Bar
}
}
</script>
You may wonder: "Why do I need to write this or Vue? I just want to write l", that's all!". This is how Vue is designed. To provide global functionalities shared by all components, static properties must be added to the Vue object or prototype properties (Vue.prototype) accessible through this in Vue instances.
EDIT
An alternative solution came to mind...
Edit your index.html to include this:
<script>
var l = console.log.bind(console)
</script>
To avoid ESLint errors, edit your .eslintrc.js file to reference the new global variable:
globals: {
l: true
}
The contents of the file should look like this:
// http://eslint.org/docs/user-guide/configuring
module.exports = {
root: true,
parser: 'babel-eslint',
parserOptions: {
sourceType: 'module'
},
globals: {
l: true
},
env: {
browser: true,
},
extends: 'standard',
plugins: [
'html'
],
rules: {
'arrow-parens': 0,
'generator-star-spacing': 0,
'no-debugger': process.env.NODE_ENV === 'production' ? 2 : 0
}
}
Restart your dev server. Now, you can use l in your code:
<script>
export default {
name: 'app',
created () {
l('It works!')
}
}
</script>
Set console.log in this manner.
window.l=console.log;
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