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Merge #3942

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3942: vscode: fix typing bug in config r=matklad a=Veetaha

I noticed that the type of nullable properties in config is actually non-nullable
![Screenshot from 2020-04-11 15-29-45](https://user-images.githubusercontent.com/36276403/79043702-6a686d80-7c09-11ea-9ae8-f1a777c7d0f2.png)


Co-authored-by: veetaha <veetaha2@gmail.com>
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bors[bot] 2020-04-11 13:26:17 +00:00 committed by GitHub
commit 372414d27b
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1 changed files with 30 additions and 9 deletions
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editors/code/src/config.ts
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@ -66,23 +66,44 @@ export class Config {
return vscode.workspace.getConfiguration(this.rootSection); return vscode.workspace.getConfiguration(this.rootSection);
} }
get serverPath() { return this.cfg.get<null | string>("serverPath")!; } /**
get channel() { return this.cfg.get<UpdatesChannel>("updates.channel")!; } * Beware that postfix `!` operator erases both `null` and `undefined`.
get askBeforeDownload() { return this.cfg.get<boolean>("updates.askBeforeDownload")!; } * This is why the following doesn't work as expected:
get traceExtension() { return this.cfg.get<boolean>("trace.extension")!; } *
* ```ts
* const nullableNum = vscode
* .workspace
* .getConfiguration
* .getConfiguration("rust-analyer")
* .get<number | null>(path)!;
*
* // What happens is that type of `nullableNum` is `number` but not `null | number`:
* const fullFledgedNum: number = nullableNum;
* ```
* So this getter handles this quirk by not requiring the caller to use postfix `!`
*/
private get<T>(path: string): T {
return this.cfg.get<T>(path)!;
}
get serverPath() { return this.get<null | string>("serverPath"); }
get channel() { return this.get<UpdatesChannel>("updates.channel"); }
get askBeforeDownload() { return this.get<boolean>("updates.askBeforeDownload"); }
get traceExtension() { return this.get<boolean>("trace.extension"); }
get inlayHints() { get inlayHints() {
return { return {
typeHints: this.cfg.get<boolean>("inlayHints.typeHints")!, typeHints: this.get<boolean>("inlayHints.typeHints"),
parameterHints: this.cfg.get<boolean>("inlayHints.parameterHints")!, parameterHints: this.get<boolean>("inlayHints.parameterHints"),
chainingHints: this.cfg.get<boolean>("inlayHints.chainingHints")!, chainingHints: this.get<boolean>("inlayHints.chainingHints"),
maxLength: this.cfg.get<null | number>("inlayHints.maxLength")!, maxLength: this.get<null | number>("inlayHints.maxLength"),
}; };
} }
get checkOnSave() { get checkOnSave() {
return { return {
command: this.cfg.get<string>("checkOnSave.command")!, command: this.get<string>("checkOnSave.command"),
}; };
} }
} }