Using external javascript script in TypeScript - Stack Overflow

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Let's say I have a javascript file, myScript.js, with the following content:

function run(file) {
    // some operations
}

How can I use the 'run' function inside a TypeScript file?

I've read similar questions but didn't find their answers clear enough: where I declare the function? how do I reference the declaration file etc..

Let's say I have a javascript file, myScript.js, with the following content:

function run(file) {
    // some operations
}

How can I use the 'run' function inside a TypeScript file?

I've read similar questions but didn't find their answers clear enough: where I declare the function? how do I reference the declaration file etc..

• javascript
• typescript

Share Improve this question Follow edited Jul 4, 2016 at 10:33 yonisha asked Jul 4, 2016 at 10:03 yonishayonisha 3,09622 gold badges2626 silver badges3333 bronze badges 3

• You need to write a declaration file for that script – Nitzan Tomer Commented Jul 4, 2016 at 10:05
• 1 Possible duplicate of Using a 3rd party js file with TypeScript – Nitzan Tomer Commented Jul 4, 2016 at 10:06
• I think that the other answers are not details enough. Where should I declare it? where is the reference to the js file? That's the information I'm looking for – yonisha Commented Jul 4, 2016 at 10:21

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1 Answer 1

Sorted by: Reset to default 5

TypeScript does not know about the run function. You'll have to declare it:

declare function run(file: any): any;

Now this works:

run(myFile);

EDIT: you can also look into using "--allowJs" tsc parameter mentioned here, but I have no experience with it.

EDIT 2: If the external script is a published library, chances are that there is a typings file (.d.ts) for it. Check out the typings tool in that case.

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