winglang/wing

improve error message when accessing an optional map property

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#2,020 opened on Apr 9, 2023

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good first issue✨ enhancement🛠️ compiler

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Description

Feature Spec

Assuming we have an optional Map, and we want to access one of its properties, optional_map.get("property") (or even optional_map?.get("property")) will throw the following error: "property access unsupported on type Map?" this error message might not be clear enough to guide the user on how to fix the error.

(At the end I solved it this way:

let m = optional_map ?? {property: "x"};
m.get("property");

)

Use Cases

accessing a property on an optional map

Implementation Notes

We will also support optional_map?.property in the future

Component

Language Design

Community Note

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Contributor guide

Research direction
Locate the error message in the Wing compiler source code and improve it to guide users to use the `??` operator for default values.
Tech stack
typescript
Domain
developer experience
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Git
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75