Viewing Method Parameter Information
Parameter hints show the names of parameters in methods and functions: In TypeScript, parameter hints are by default shown right in the editor making your code easier to read: Learn more from TypeScript parameter hints and TypeScript inferred type information.
View the parameter hints for a method
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Place the caret anywhere within the call of the method or function and press Ctrl+P or choose
on the main menu.
Configure the appearance and behavior of parameter hints
In the Settings/Preferences dialog (Ctrl+Alt+S), choose General under Editor, and then choose Code Completion. The Code Completion page opens.
To have the list of parameter types for the called method or function shown automatically after a certain delay, select the Auto pop-up (in ms) checkbox and specify the time period in milliseconds.