Error in TypeScript Compiler: When using @types/d3-tip, it is not possible to call an expression that does not have a call

Seeking help to understand an error I encountered, I have read all similar questions but found no solution.

My understanding of TypeScript is still growing. I am attempting to integrate the d3-tip module with d3. After installing @types/d3 and @types/d3-tip, my code now appears as follows:

import * as d3 from 'd3';
import * as d3Tip from 'd3-tip';
console.log(d3Tip) // Outputs the function signature from d3-tip module
console.log(d3Tip()) 
// Results in error 'Cannot invoke an expression whose type lacks a call signature'
d3.tip = d3Tip 
// Results in error 'Property 'tip' does not exist on type 'typeof "<my-project-path>/node_modules/@types/d3/index"''

I believe there are two issues: firstly, I am unable to call the d3-tip method, and I am unsure why this is the case. Secondly, I am unable to add the d3Tip function as a new property of the d3 object (which previously worked well in ES6), allowing me to create a tip using d3.tip().

While I could explore other solutions, such as creating the tip from scratch (perhaps saving time), I prefer to grasp the resolution for this issue.

Any suggestions or insights?

Answer №1

Great inquiry. I start off by installing using npm install @types/d3-tip. Then, it becomes necessary for me to duplicate

./node_modules/@types/d3-tip/index.d.ts
and save it as ./d3-tip.d.ts. After completing this step, the subsequent code functions properly:

import * as d3 from "d3";
import "./d3-tip";

d3.tip().hide();
let arc = d3.arc();

Therefore, the declarations in d3-tip.d.ts are successfully integrated into the d3 namespace as intended. The reason why it doesn't work without copying remains a mystery to me. Any suggestions or assistance?

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