Exploring the differences between importing all utilities as a whole using `import * as util from "./util"` and importing a specific function only with `import {someFunction

When comparing the two options of importing from a module, which is better: import * as util from "./Util" or

import {someFunction} from "./Util"
?

Answer №1

Util is imported using import * as util from "./Util", which is the equivalent of require("./Util") in CommonJS. ES6 imports allow for direct object destructuring assignments, enabling treeshakable libraries. Treeshaking involves importing only the necessary code of a module, making it beneficial for web-based projects. One example is @angular/flex-layout, where the whole library size is 17.6kB but individual exports are much smaller.

While using this technique for local files may not be fully efficient since unused parts of a module specific to a project are rarely encountered, it is still a good practice. The usage of a module can evolve as a project progresses, making tree shaking valuable for optimization.

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