Typescript: Compile error when using getBufferAsync(Jimp.AUTO)

[msdtim]

Expected Behavior

getBufferAsync(Jimp.AUTO) should be allowed as per package README

If Jimp.AUTO is passed as the MIME type then the original MIME type for the image (or "image/png") will be used. Alternatively, image.getMIME() will return the original MIME type of the image (or "image/png").

Current Behavior

VSCode will report problem and tsc will throw compile error

Failure Information (for bugs)

Compiler output:

error TS2345: Argument of type '-1' is not assignable to parameter of type 'string'.

Steps to Reproduce

npm install -g typescript
npm install --save jimp
npm install @types/node --save-dev
tsc -p tsconfig.json

Context

In the jimp.d.ts, these functions should be updated to allow number type for mime parameter.

 getBase64(mime: string, cb: GenericCallback<string, any, this>): this;
 getBase64Async(mime: string): Promise<string>;
 getBuffer(mime: string, cb: GenericCallback<Buffer>): this;
 getBufferAsync(mime: string): Promise<Buffer>;

• Jimp Version: 0.10.2
• Operating System: macOS 10.14.6
• Node version: 12.16.1

Failure Logs

[hipstersmoothie]

🚀 Issue was released in v0.17.7 🚀

[hipstersmoothie]

🚀 Issue was released in v0.17.7 🚀