@gerhobbelt/mathjax-third-party-extensions

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A list of MathJax extensions provided by third-party contributors

github.com/mathjax/mathjax-third-party-extensions

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text/typescript

export function isPromise(value: any): value is PromiseLike<any> { return value && typeof (<any>value).subscribe !== 'function' && typeof (value as any).then === 'function'; }