Microsoft/TypeScript

`satisfies` does not work on a variable called `type`

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#58,248 opened on Apr 19, 2024

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BugDomain: ParserHelp Wanted

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Description

🔎 Search Terms

satisfies, type, ts1005

🕗 Version & Regression Information

This happens from 3.3.3333 to nightly.

satisfies was introduced in 4.9.

⏯ Playground Link

https://www.typescriptlang.org/play?#code/MYewdgzgLgBFCeAHApjAvDA5AD0wKDwRRggEMoBLCAMwuQhKgCcKwBzPIA

💻 Code

const type = 'x'

type satisfies string // '=' expected.(1005)

🙁 Actual behavior

Gives an '=' expected.(1005) error.

🙂 Expected behavior

For it to work like with any other variable of any other name, specially since it's a common variable name.

Additional information about the issue

This also happens with other TypeScript keywords like interface.

If I wrap type in parenthesis it works, is this expected behaviour? The Deno formatter removes it (prettier handles it correctly), should I report this to them.

Contributor guide

Research direction
Investigate the TypeScript parser to understand why the `satisfies` keyword fails when the variable name is `type`, a reserved keyword, and determine if the parser should treat it as a contextual keyword.
Tech stack
typescript
Domain
tooling
Issue type
Bug
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.
Under 1 hour
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
TypeScript
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60