How to use the parcel-bundler/src/utils/fs.readFile function in parcel-bundler

async resolveAssetContents(asset) {
        let contents = asset.generated[this.bundle.type]
        if (!contents || (contents && contents.path)) {
            contents = await fs.readFile(contents ? contents.path : asset.name)
        }

        console.log(asset.generated)

        // Create sub-directories if needed
        if (this.bundle.name.includes(path.sep)) {
            await fs.mkdirp(path.dirname(this.bundle.name))
        }

        // Add the hot-reload.js script to background scripts
        const json = JSON.parse(contents)
        json.background = json.background || {}
        json.background.scripts = json.background.scripts || []
        json.background.scripts.unshift('hot-reload.js')
        contents = JSON.stringify(json)