@graphql-tools/utils/esm/fakePromise.js

Common package containing utils and types for GraphQL tools

function isPromise(val) {
    return val?.then != null;
}
export function fakeRejectPromise(error) {
    if (isPromise(error)) {
        return error;
    }
    return {
        then() {
            return this;
        },
        catch(reject) {
            if (reject) {
                return fakePromise(reject(error));
            }
            return this;
        },
        finally(cb) {
            if (cb) {
                cb();
            }
            return this;
        },
        [Symbol.toStringTag]: 'Promise',
    };
}
export function fakePromise(value) {
    if (isPromise(value)) {
        return value;
    }
    // Write a fake promise to avoid the promise constructor
    // being called with `new Promise` in the browser.
    return {
        then(resolve) {
            if (resolve) {
                const callbackResult = resolve(value);
                if (isPromise(callbackResult)) {
                    return callbackResult;
                }
                return fakePromise(callbackResult);
            }
            return this;
        },
        catch() {
            return this;
        },
        finally(cb) {
            if (cb) {
                const callbackResult = cb();
                if (isPromise(callbackResult)) {
                    return callbackResult.then(() => value);
                }
                return fakePromise(value);
            }
            return this;
        },
        [Symbol.toStringTag]: 'Promise',
    };
}