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# Vuejs and TypeScript- Working Together like Peanut Butter and Jelly

How do you handle untyped JavaScript libraries in a mature Vue and TypeScript project? Discover type integration strategies to safely bridge this gap without relying on risky escape hatches.

- **Speakers:** Rob Richardson
- **Event:** WeAreDevelopers LIVE
- **Published:** March 24, 2021
- **Duration:** 44:31
- **URL:** https://www.wearedevelopers.com/videos/127-vuejs-and-typescript-working-together-like-peanut-butter-and-jelly

## Summary

Combining Vue.js and TypeScript offers developers a balanced approach to building scalable single-page applications, leveraging Vue's approachable single-file components alongside TypeScript's robust design-time syntax validation. While Vue prioritizes a low learning curve by keeping HTML, CSS, and interactive logic separated, adding TypeScript forces teams to catch invocation errors before runtime. However, a significant hurdle emerges when modern typed projects require mature, untyped JavaScript libraries—such as Lodash or Vuetify—causing immediate compilation friction.

To seamlessly bridge this gap, developers must apply a hierarchy of type integration strategies. The ideal approach begins with sourcing native TypeScript bindings or relying on the open-source DefinitelyTyped repository for existing package definitions. When community definitions are absent, engineers can manually cast objects using the `as` keyword, hand-craft a custom type declaration file, or leverage the TypeScript compiler to auto-generate baseline module types.

While Vue paired with static typing greatly improves developer intercommunication and syntax safety in long-lived applications, it cannot replace robust unit testing for validating actual business logic without providing a false sense of security. Furthermore, teams should strongly avoid utilizing escape hatches like `as any` or `@ts-ignore` except as an absolute last resort, as these practices quickly undermine the core architectural predictability of adopting a typed superset.

**Keywords:** vue.js framework, typescript integration, single-page applications, single-file components, legacy javascript libraries, type declaration files, definitelytyped repository, design-time syntax validation, vuetify material design, static type casting, generating type definitions, babel transpilation, migrating untyped packages, frontend developer tooling, typescript escape hatches

## Chapters

1. **Comparing Vue to React and Angular** (02:06) — An overview of why Vue optimizes for developer productivity compared to Angular's tooling focus and React's complex state capabilities.
1. **Initializing a new Vue application via the CLI** (05:06) — How to use the Vue CLI to scaffold a new project and select features like Babel, TypeScript, and routing.
1. **Solving function calling errors with TypeScript** (06:17) — How TypeScript acts as a design-time superset of JavaScript to ensure you structure and call functions correctly.
1. **Annotating codebase files with explicit TypeScript constraints** (10:55) — Renaming JavaScript files to TypeScript and adding explicit type hints to interfaces and function parameters.
1. **Configuring Vue single-file components with TypeScript** (14:14) — How single-file Vue components leverage the TypeScript execution context alongside scoped CSS and HTML templates.
1. **Resolving type errors when installing Vuetify components** (17:18) — Troubleshooting typing issues that arise when importing external design libraries into a strict TypeScript project.
1. **Building interactive counter and form components** (20:24) — Creating interactive counter components and utilizing robust Vuetify text fields to implement input forms.
1. **Resolving form element errors via type casting** (24:15) — How to cast Vue references via the as syntax to tell the TypeScript compiler the expected HTML element type.
1. **Writing custom declaration files for Lodash** (27:58) — Creating a basic definition file to manually add missing TypeScript support for specific Lodash utility methods.
1. **Downloading community type definitions from DefinitelyTyped** (31:49) — Pulling complete interface definitions from the open-source DefinitelyTyped repository to gain vast type checking coverage quickly.
1. **Generating definitions for untyped Vue plugins** (33:32) — Running the TypeScript compiler in declaration mode to auto-generate a starter typings file for legacy Vue-compatible packages.
1. **Prioritized strategies for typing external JavaScript libraries** (38:24) — A prioritized development checklist for introducing strict types to external dependencies that lack out-of-the-box TypeScript compatibility.
1. **Deciding when to adopt or avoid TypeScript** (41:39) — Assessing why TypeScript excels in long-term source clarity but slows down prototyping that depends heavily on untyped dependencies.

## Related Moments

- [Choosing Vue and GraphQL for strong typings](https://www.wearedevelopers.com/videos/1666-lessons-learned-from-building-a-thriving-vue-js-saas-application) (from "Lessons learned from building a thriving Vue.js SaaS application")
- [The origins and early problems solved by TypeScript](https://www.wearedevelopers.com/videos/100061-typescript-features-that-changed-the-game) (from "TypeScript Features That Changed the Game")
- [Core takeaways for end-to-end TypeScript development](https://www.wearedevelopers.com/videos/1580-end-to-end-typescript-completing-the-modern-development-stack) (from "End-to-End TypeScript: Completing the Modern Development Stack")
- [Choosing TypeScript for complex backend applications](https://www.wearedevelopers.com/videos/1033-nest-js-typescript-in-the-backend-can-also-be-clean) (from "Nest.js - TypeScript in the backend can also be clean")
- [The importance of TypeScript in enterprise Svelte projects](https://www.wearedevelopers.com/videos/493-svelte-typescript-and-so-will-you) (from "Svelte ♥ TypeScript and so will you")
- [Evaluating benefits and trade-offs of using TypeScript](https://www.wearedevelopers.com/videos/646-4-steps-from-javascript-to-typescript) (from "4 Steps from JavaScript to TypeScript")

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- [What is TypeScript?](https://www.wearedevelopers.com/magazine/47-what-is-typescript)
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