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Tagged Template Signature Help Support in Language Service - #1204
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Conflicts: src/services/signatureHelp.ts
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"Paramter"
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What you mean unclosed in this context?
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I should probably be more explicit - it kind of sounds like I'm referring to a template expression without a template tail. I really mean unterminated, in the sense that your literal isn't explicitly sealed off with a backtick. I'll clarify it. Thanks!
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Say that this can be call or new
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Also remove else
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Maybe just ===
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Conflicts: src/services/signatureHelp.ts
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LGTM |
Daniel Rosenwasser (DanielRosenwasser)
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Tagged Template Signature Help Support in Language Service
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Signature Help for Tagged Templates
This PR enables signature help support in the language service for tagged template strings.
The idea is that a tagged template is a bit of an implicit function invocation. Whenever a user requests signature help (or it is triggered by the consuming environment), we should figure out what function a tag refers to, which overload should be chosen, and which parameter is currently being fed.
Substitution-Argument Correspondence
When a template expression is tagged, each substitution expression corresponds to an argument in invoking that tag. Specifically, the Nth substitution expression in a tagged template expression is the (N+1)th argument in an invocation.
TemplateStringsArray Argument
Whenever the cursor lies within a template literal (whether a no-substitution literal, or a fragment of a template expression), the parameter in question is the first parameter of the tag in question. This is because each template literal in a tagged template corresponds to an array element in the cooked/raw array object specified in ES6. This means that as the cursor moves through a template expression, parameters will not be highlighted from left-to-right consistently.